Grammarly Review: Best or Overhyped? (March 2020)

Brad Smith

Not everyone is a writer.

And the English language isn’t exactly simple.

That’s where a service like Grammarly comes in.

Is Grammarly Worth it? Is it really the ultimate grammar, spelling, and plagiarism checker tool?

Or is it just another overhyped, expensive premium tool? 

We’ve been a paying premium user for over three years, using it on a daily basis. 

So that’s what we’ll answer in this hands-on, in-depth Grammarly review.

Disclosure: Grammar Gang is reader-supported. We might earn a small commission if you purchase something through our site. Learn more.

Our Verdict: After reviewing over 20 different grammar and plagiarism tools, Grammarly is the clear winner across both categories.
Grammarly
Monthly (Paid Annual)
$11.66
Best All-Around
★★★★★
✅ 86/86% accuracy
✅ 16+ billion database
✅ 150k word limit
✅ 5 device limit
✅ 1 hour response
❌ English only
Visit Grammarly

Grammarly Premium Review: Video Overview

Check out Grammarly's features →

Grammarly Features: Is Grammarly Safe to Use?

Grammarly is a tool that dives deep into nearly every conceivable facet of the grammar checking process, looking for everything from proofreading spelling errors to plagiarism to writing in a passive voice.

That’s why it’s important to take this moment to identify some of the system’s key features before diving head-first into the tool’s pros and cons.

Here are just some of the issues the free and premium versions catch:

  • Proofreads your entire document for spelling mistakes
  • Looks for improper punctuation mistakes
  • Examines English fluency and proper word choices
  • Makes recommendations on your dialectal conventions, including capitalization and spacing
  • Ensures that you’re using a properly formal or informal tone, including whether you’re ending sentences with a preposition.
  • Makes sure that there’s confidence in your work, marking any weakness or uncertainty in your prose
  • Recommends words that can be cut out, helping you to create a more concise document
  • Determines how easy your writing is to understand
  • Checks the entire document for repetitive vocabulary or phrasing
  • Compares the document against billions of websites for common phrasing, determining the level of plagiarism
  • Can be submitted to a human proofreader for those of you that don’t trust artificial intelligence. (Additional costs apply)
  • Genre-specific writing checks, customizable to the type of document you’re creating
  • Browser extension available to check everything from emails to blog posts to novels
  • Supports the English language. Can be customized between American English and British English

There you have it. That’s an impressive list of features.

On paper, Grammarly seems to go above and beyond the realm of your standard grammar checker. But saying that you’ve got these features means nothing if they don’t work. So, let’s dig in and see if Grammarly can back up this impressive list.

Grammarly Pros: Is Grammarly Really Worth It?

Grammarly is a full-service grammar, proofreading, and plagiarism checker, with both a free version and premium plans.

You can run a full scan on any copy you’ve written, and Grammarly will make sure it is squeaky clean from spelling mistakes, grammar errors, punctuation mistakes, plagiarism issues, and loads more.

Plus, the Grammarly Handbook will provide detailed explanations of these issues so you actually become a better writer after using it.

My hands-on test was a breeze. We used the online editor, browser extension, desktop, and even mobile apps to compile this review.

It accurately flagged 86% of the mistakes on our control article (that we run through every grammar checker and plagiarism tool). The plagiarism checker, specifically, tore our sample copy to shreds (in a good way).

In addition, the customer service department was both fast and friendly (responding in about an hour).

But enough beating around the bush. Here are all of the details.

1. Very User-Friendly (10 seconds or less)

Both the web-based and desktop options from Grammarly are easy to use.

After heading over the www.grammarly.com, you sign in and it takes you to the system’s dashboard.

From this control panel, you can either start a new document or open a previous one.

Grammarly dashboard after signing in.
Grammarly’s control panel.

I chose to start a new document and got right to work.

It took me to a fresh page, where you can either paste in copied text or upload a file to be checked. I decided to copy and paste our sample article.

Grammarly text editor to paste your content.
This is where you could upload a document.

We follow the same steps for every tool test.

We have a control article that is loaded with plagiarism. Like, it’s really really bad.

It was originally for a client project and we paid a real writer to produce it. Then, we saw how it was basically just ripped off a bunch of other sources.

So we use this same article to provide a benchmark across each tool to get a consistent baseline of accuracy for each premium tool.

But before checking, I set a list of goals to give Grammarly a better sense of what we were looking for in this article:

Grammarly goals to improve grammar-checking accuracy.
This is where you could set up your goals when you start a new document.

Your intent helps Grammarly decide which mistakes it’ll flag or ignore.

Are you trying to inform, describe, convince, or tell a story? What kind of audience are you trying to reach? Are they experts in the field you’re writing about? Are they knowledgeable? Or are you dealing with a general audience, who may or may not know anything about your topic?

You can also decide if you’re writing in a formal or informal manner and if you’re going for a mild or strong tone.

Finally, you can tell Grammarly where this content is going so it can better decide how to handle certain mistakes:

  • General
  • Academic
  • Business
  • Technical
  • Creative
  • Casual

After you’ve decided on goals, it’s time to check the actual document.

Once I pasted the copy, the system got right to work. I had my results in less than ~10 seconds.

Grammarly has a ton of extra features once you drill down into the details. You can view them all in detail here based on our hands-on test:

1.2. In-Depth Recommendations Based on Context
Grammarly marked 14 different spelling mistakes throughout our sample article.

Just accurately flagging them is the first step, though. Grammarly also wants you to understand why each mistake is wrong so your writing style gets better over time.

In other words, most checker services simply tell you what. Grammarly tells you why.

Grammarly's spelling correction with recommended words.
This is a sample where you could see the correction made and why.

As you can see, it flagged the words “come back” and said that they should be one word based on the context. It not only explained why it gave this suggestion, but it gave a number of examples for me to read through.

The Grammarly Handbook also delves into more detail on these issues if you’re trying to understand how to catch them yourself.

I have the option to either accept their correction, reject it by clicking on the trash can icon, or flag it as wrong or offensive.

1.3. Recommendations Can Be Tailored to You

Like the spelling category, Grammarly’s proofreading also highlighted a number of problematic sections and gave reasons as to why each was a problem.

Here’s one example about sentence fragments:

Grammarly flagging a sentence fragment mistake.
This is a sample where you could see a sentence fragment correction.

The issue is highlighted in yellow on the left. Grammarly then explains on the right that it is an incomplete sentence, and goes on to explain what a sentence fragment is and how one can avoid them.

I love that they continue with examples, showing you both correct and incorrect sentences.

On the bottom, you can let Grammarly know that you’ll address this issue, or that it is not relevant or helpful.

For example, if you’re writing on the web, sentence fragments aren’t as big of a deal. And they can help add more voice to a piece.

So you can help give Grammarly feedback to let some of these proofreading mistakes fly if you understand the issue and are still fine with letting a few slip in.

1.4. In-Depth Punctuation Tips

There are 22 different punctuation errors highlighted throughout our sample article.

But, once again, Grammarly rises to the occasion, correcting the mistakes and informing you as to the grammar rules behind each mistake:

Grammarly punctuation issues around misplaced commas.
Sample of correction on punctuation and why.

What I love about this is that it not only gives you a mini-lesson about how to use independent clauses, it also gives you a number of different suggestions on how to fix them.

You can add a semi-colon, include the word “and,” or just plop a period on there and make them two complete sentences.

There’s a nuance in writing. And Grammarly gets that. There might be several ‘correct’ ways to write this so you have options.

All too often, grammar checkers will get by on the minimum and give you only one recommendation, but Grammarly is going above and beyond.

1.5. Helps You Write Better, Not Just More Accurately

Fluency is so important to a successful article. It’s something writers obsess over.

Finding the best word choices can be a daunting task, and sometimes a little help can go a long way. Grammarly provides that service to its users, offering suggestions and reasoning to improve upon your writing. That’s as true for Forbes as it is in college or writing for any old Hawaii vacation site.

Grammarly fluency recommendations to choose better words.
Sample where it shows you better word choices.

This is where Grammarly proves itself beyond the simple spell check of writing programs like Microsoft Word or other writing apps. Identifying fluency is some really advanced intuitive programming and I salute them for it.

In the example above, Grammarly identified that “content,” as a noun, might work better with the word “intellectual” as opposed to “thoughtful.” So it’s factoring in parts of speech in these recommendations.

I agree with their suggestion of 100%. That’s the kind of insight that you can normally only get from a human editor.

1.6. Conventions

While not many conventions were identified in this test piece, those that were made a major difference. Here’s a perfect example:

Grammarly catches a dialectal convention for spelling out numbers under ten.
Sample of convention check.

Once upon a time, editors had to rely on style guides, constantly flipping through them to find conventional rules.

Grammarly offers all of these rules built-in. AP writing style recommends writing out all numerals under 10, and I’ve never seen an artificial intelligence program catch that before.

The other recommendation was fixing the spacing between two words. That’s something most systems can identify, but it was still nice to see a program like Grammarly catching both the everyday spelling mistakes and some more advanced problems.

The Grammarly Chrome plugin, for instance, will help you fix everything from emails to social posts. But more on that in a few minutes…

1.7. Formality -- Write 'Right' for the Context

Formality is one of those things that make grammatically-inclined people absolutely crazy.

It goes beyond a formal or informal tone and into the realm of some of the unwritten rules that exist within the English language.

Grammarly formality issue with ending sentence with a preposition.
Sample of formality check.

The example highlighted above is a huge no-no.

Ending a sentence with a proposition like “with” drives editors insane. Grammarly catches it and gives you the mini-lesson to cut out the bad habits.

It goes on to give a number of examples, such as not using “and/or” in a formal writing piece and starting sentences with a coordinating conjunction like “and” or “but.”

1.8. Write with More Clarity by Writing Confidently

When you write, it’s important to have confidence backing up your words.

You’re an expert in your field, so it’s important to sound like one.

Weak and ineffectual language can soften your message, clouding your knowledge behind a wall of timid uncertainty.

Grammarly confidence score helps improve clarity.
Sample result when checking for weak or uncertain language.

Grammarly’s Confidence score helps you write with more clarity at the end of the day.

Grammarly once again goes above and beyond to help professional writers sharpen their craft. Novice writers also learn something new that will help them in the long-run.

1.9. Catches Concision Issues

Verbose, overly purple prose can tire a reader out, losing your message along the way. Concision doesn’t make writing dry, then, it boosts clarity, instead.

Grammarly catches concision issues around unnecessary words.
Example of how Grammarly catches unnecessary words.

Grammarly combs your work for erroneous words or phrases that take away from the overall article.

Wordiness is the enemy when trying to create engaging content. And Grammarly has proven itself to be a beneficial proofreading tool in that fight.

1.10. Spots Passive Voice Issues

A passive voice can obscure your message, and Grammarly understands this.

Whether you write 1,000 words or 100,000 words, if your message is not easy to understand, it’s worthless.

Grammarly spots passive voice issues, too.
Sample where Grammarly checks for clarity.

Grammarly is also advanced enough to detect passive phrasing.

Sometimes it’s difficult to see when your own voice turns passive, so it’s great that Grammarly has the ability to point that out.

The passive language might slip by the tired eyes of a human being, but a program like Grammarly can tirelessly hunt down unclear phrasing, bringing it to your attention.

1.11. Helps You Improve Word Choice Variety

It’s true that variety is the spice of life. It’s also the key to effective writing.

Overusing certain phrases or words might take the reader out of the moment, causing your voice to become repetitive and lazy.

Grammarly is quick to point this out, identifying overused terms and giving you suggestions on how to change them up.

Grammarly variety score catches overused words.
Sample where a variation of words are suggested to avoid overuse or redundancy.

As an editor, I can tell you that it’s easy to see a word or phrase pop up and go, “wait, didn’t I see that before?” Having a service like Grammarly identify tricky grammar rules with the push of a button can make the lives of copy editors very easy for years to come.

2. Extremely Accurate (16+ Billion Database)

Grammarly pulls from a proprietary database of over 16 billion websites. That’s a whole lot of internet real estate, and they cover it in under a minute.

But the bigger the database, the more sources they’ll have to pull from and match to make sure accuracy is never an issue.

As mentioned, we use the same control article to check every tool.

So we can immediately tell whether each checker is accurate or not.

Grammarly ranks at the top of that list, spotting just about every issue we had in the document.

When it’s finished analyzing your text, you’re left with a marked-up article and a sidebar on the right-hand side which lets you navigate the recommendations by category.

Grammarly sidebar with recommendations.
Sidebar where you could navigate recommendations per category.

See that 87 at the top? That’s our overall score. It’s saying that this copy is better than 87% of the documents uploaded to Grammarly with similar goals.

It then runs down the entire list of categories that fall under the Grammarly software umbrella, like grammar, punctuation, conciseness, and more. The number beside each category is the number of suggestions the system has for you on that particular subject.

So, for example, there were six instances where Grammarly felt our variety was off. The spell checker also found 14 different spelling corrections, 22 perceived punctuation mistakes, and so on.

I found all of the advice given to be highly accurate and helpful to the overall piece. Let’s go through a few of them individually.

3. Most Accurate Plagiarism Checker (#1 out of 10)

Plagiarism is a stain on the writing world.

Taking credit for someone else’s work is a reprehensible offense.

An act of plagiarism can be met with a series of consequences, up to and including a costly lawsuit, so you’ll want to make sure that everything you’re posting on a business website is on the up and up.

Even if it’s other writers doing the work on your behalf.

We’ve tested over ten different plagiarism checkers and found Grammarly to be the most accurate. (Please note that you’ll need the premium option to access the plagiarism features.)

The sample article that we used to check these programs is loaded with plagiarized content. A good plagiarism checker will quickly see that more than 80% of this piece is unoriginal.

Grammarly tore through it like a jungle cat on a gazelle, coming to the conclusion that 86% of this article was taken from other sources. It went on to identify 11 different sites with similar or matching content.

Grammarly Plagiarism Test Article Results
Sample of Grammarly’s plagiarism check.

Most plagiarism is accidental, so it’s great that Grammarly is providing you with sources to properly cite your information. Remember, anything that is not original has to be cited, or your business could face severe penalties.

But sometimes, like in the case of this article sample, it’s not. Someone is blatantly copying other people’s work.

The plagiarism checker for Grammarly is not a separate application. The beauty of Grammarly’s design is its simplicity. One copy and paste gets you the whole shebang, from grammar and spelling all the way to plagiarism.

Grammarly isn’t unfair in its assessment either. We also uploaded a totally original piece and let Grammarly work its magic:

Grammarly's plagiarism checker is also accurate, not flagging any in this clean article.
Grammarly’s plagiarism check on an original piece.

We got a very positive plagiarism report back, citing only one fragment from one source that was the only kind of similar.

It should be noted that Grammarly’s plagiarism detector is only available with their paid premium version, and free users have no access.

As an aside, you should also do a few manual checks if you think plagiarism is an issue.

For example, check out the two benefits listed in this post we purchased from a popular writing tool:

Example article we purchased from a writer that plagiarized.
Benefits of purchasing Grammarly.

Then, we looked up the top-ranking pages for that word in Google, and found this:

Example of an article that Grammarly caught.
Sample of top-ranking words in Google.

Bottom line: Plagiarism is tough to spot. But a tool like Grammarly Premium can help cut down on the big mistakes tremendously.

4. High Limits (150k+ Words)

Grammarly’s limits are more than fair, and they should serve the purposes of professional writers and editors as well as most businesses.

Five different devices can be connected to a Grammarly Premium version.

They allow 300 reviewed documents or 150,000 words to be reviewed in a 30-day period. To put that in perspective, a full-length novel is 60,000 words, so you’re getting a lot.

There is also a daily limitation. You can review 100 documents, or 50,000 words, in 24 hours. So, in theory, you could use up your entire allotment in a three day period at the fastest, but you’d have to be putting in a lot of information to do so.

Size matters when uploading a document. Grammarly requires all files to be 4MB or less. Supported file types include Microsoft Word documents, OpenOffice, .rtf, and .txt.

5. Detailed, Downloadable PDF Reports

Another of Grammarly’s more useful features is its ability to generate reports and export them as a PDF document.

You can start by clicking on the insights tab on the right of the page. It generates a mini-report that looks like this.

Grammarly Document Insights example from a downloadable report.
Shows a mini report which is downloadable.

Click on the bottom of the tool where it says “DOWNLOAD PDF REPORT.” Your download should begin automatically.

A four-page PDF was generated for me, showing the overall percentages and major mistakes identified in my doc.

Complete Grammarly report flagging all issues and recommendations.
Report showing the overall results and major issues.

From here, you can see how things like sentence structure and writing style have improved (or haven’t) over recent documents.

I also love that it gives you the reading and speaking time for the document. This is helpful for anyone working on a speech or presentation.

6. Tool compatible with Mac, Windows, Chrome, Firefox, Safari, Word, Outlook, Google Docs, and More.

Personally, I like the Grammarly online editor.

But the good news is that there’s an app available for pretty much every circumstance.

You can use a Grammarly extension on basically any tool, including browser plugins for Chrome, Firefox, and Safari. You can correct your emails and social media postings before putting them up. This is essential for social media marketing managers and business people who have a lot of email communication with clients.

I tried it out for myself using their Grammarly Chrome Extension, enabling Grammarly to check my terrible email skills:

Grammarly Chrome Extension can flag Gmail issues.
Checking Gmail with the Grammarly Chrome plugin.

I purposely made a number of mistakes and all of them were highlighted.

At first, I was dismayed to see that they weren’t catching my punctuation mistakes, but then I saw a Grammarly browser button in the bottom right-hand corner of my email window, and when I clicked on it, my faith was restored.

Grammarly Chrome can pull up detailed reports.
Sample of how Grammarly looks like on the Google Chrome extension.

Honestly, don’t leave home without the Grammarly Chrome extension.

There is also a Grammarly desktop app. I tested it with the Microsoft Word extension and liked it a lot. It adds a lot of these helpful extra tools that Word usually lacks.

Grammarly Word integration example.
Sample of how Grammarly looks like on Microsoft extension.

Once activated, the Word add-in works just like the standalone Grammarly desktop version.

You’ve got the marked-up article on the left and suggestions on the right. They also have an app for Microsoft Outlook, too. So you can enable Grammarly to check everything from emails to essays with the Office add-in.

You can customize the experience by deciding what Grammarly will check for in the bar at the top. Advanced mistakes, genre, vocabulary enhancement, and plagiarism are for the premium level accounts only and are not accessible to free members.

Grammarly also has an extension for Google Docs that’s perfect for double checking informal, one-off pieces like blog posts. So you can now add the extension and write like normal, taking advantage of the real-time collaboration while still getting detailed insights to improve your sentence structure.

Last but not least, you can install Grammarly on both iOS and Android mobile devices.

The mobile app is actually a keyboard that installs into your operating system. It requires some additional changes in your phone’s settings but acts as a constant editing companion for all of your text messages and mobile content. It’s very helpful for the business person on the go.

So whether you prefer the Grammarly online editor or one of the numerous extensions, apps, or plugins, you’re covered no matter where you go.

7. In-Depth English Language Recommendations

While some may think that the English language is the same everywhere, there’s a huge difference between American English and British English.

For example, an American writer would write the word “center” while a British writer would write “centre.”

British English also throws a lot of “u’s” in seemingly random places. In both the UK and Canada, the word “color” is written “colour.”

Grammarly allows you to pick whether you’re creating content in American or British English, so you can easily proofread any English variation no matter if you’re writing for the US, Canada, or Great Britain.

8. Premium Human Proofreaders Available

Grammarly’s base service is pretty darn good. It’s already head and shoulders above the competition in accuracy and plagiarism detection.

But they take it one step further with the option for a built-in human proofreading review if you need more than a simple spell check.

For an additional cost (quite a bit, as you’ll see), you can have a real human editor look over your work to catch complex sentence structure issues or nuanced writing style mistakes.

The link for this is on the bottom right-hand corner of the Grammarly user interface. Once you click it, a number of options come up.

Grammarly Human Proofreading options and costs.
Human Proofreading feature on Grammarly.

They charge by the word. And work is returned in either 24 hours, three hours, or 30 minutes, when the proofreaders are available for it. The shorter the time frame the higher the per word price goes.

9. 1-Hour, Friendly Customer Service

Customer service is huge for me when reviewing a product. I want to make sure that my mistakes are being answered quickly and properly.

Grammarly’s customer support team is a delight.

Unfortunately, they don’t have a live chat function. But they do have a contact form that is actually answered pretty quickly.

I sent them a question regarding human proofreaders. I like to ask questions that are readily available on the website because I’m also testing the patience of their support staff. If they’re annoyed at my question and it shows, that’s bad service.

Grammarly support contact form test.
This is where you could ask Grammarly’s Customer Service some questions.

I received an answer right around the one hour mark. That’s amazing, considering most other services we tested took days to respond.

Grammarly's email support response from Christine.
A sample response from Grammarly’s Customer Service.
Grammarly's full customer service response.
Sample response from Customer Service.

This was a great answer, so complete and patient. Christine over at Grammarly really knocked it out of the park with this one.

She started off cheerfully, didn’t make me feel foolish for asking a question that is answered on their site, and walked me through the process. Perfect

Grammarly Cons: Is Grammarly Premium Worth the Cost?

That was an awful lot of pros. Just one shy of 20. The Grammarly browser option alone should be essential.

But Grammarly is not a perfect system. There are definitely some cons that we have to outline.

For starters, the free Grammarly version is just merely OK. They really really really want you to upgrade to Premium. And, I’ll be honest: it’s not the cheapest option out there if you’re just checking a few blog posts.

They also don’t support any foreign languages at this time.

Here’s a quick overview of the drawbacks.

1. Free Grammarly Version is OK (You’ll Need to Upgrade to Get Full Value)

The Grammarly free version is a good way to get your feet wet. It will make some minor edits on emails and other documents.

But it is limited in what it can do.

For example, it might tell you that you’ve got 34 issues and 47 advanced issues. Those advanced mistakes can only be seen with the Grammarly Premium version, and you’ll eventually need to upgrade to get the full value out of it.

2. Expensive Monthly Premium Version (Need to Switch to Annual Discount)

The premium version of most grammar, proofreading, and plagiarism checkers we’ve reviewed fall in the $10/month range.

A Grammarly account does, too. But only if you upgrade to the annual plan. Otherwise, the month-to-month option will set you back $29.99/month.

I started out monthly to try out the service:

Grammarly monthly billing receipt
Grammarly’s monthly receipt.

Fortunately, Grammarly offers more long-term plans to bring down this high monthly rate. We switched to annual billing years ago to take advantage of the huge discount (slashing the monthly price in half to only $11.66 / month):

Grammarly annual billing receipt
Grammarly’s annual receipt.

Of course, you can’t beat free. And they do have a good free version.

But the annual Grammarly discount is really the only way to go if you’re serious about using the premium version to unlock all this goodness.

3. Grammarly Only Supports English

Unfortunately, a Grammarly account only supports the English language at this time.

They let you choose between American English and other forms of English, such as British. But that’s about as far as the program’s language capabilities go.

So international customers will, unfortunately, have to look elsewhere. Our multilingual pick is WhiteSmoke that includes over 55 different languages.

Grammarly Premium Pricing & Plans: How Much Does Grammarly Cost a Month?

You can sign up for Grammarly for free to test it out.

And when you’re ready to upgrade, Grammarly costs anywhere between $11.66 – $29.95 a month.

Here’s how the Premium plans break down:

Grammarly's current plans and pricing.
Grammarly’s available plans and prices.

A month-to-month plan will cost $29.99 per month. A quarterly plan costs $19.98 per month, which is billed as one payment of $59.95 and lasts for four months. An annual plan, marked here as the best value, is $11.66 per month and is billed as a one-time payment of $139.95.

The annual Grammarly discount saves you the most, and I think it’s a good investment for professional writers. (You can write it off as a business expense on your taxes!)

They accept major debit and credit cards along with PayPal.

Do I Recommend Grammarly?

Yes, I recommend Grammarly.

It will cost you. It’s not the cheapest option by a long shot.

But after reviewing over 20 different grammar and plagiarism tools, Grammarly is the clear winner across both categories.

The good news is that you can test Grammarly for free to see the value for yourself.

You can use the web Grammarly version across every single browser, or download the desktop app to check Word, Outlook, and more.

Just know that Grammarly’s true potential is realized when the Premium version is allowed to shine. It works across a variety of platforms, including Microsoft Word or with the Grammarly Chrome browser extension.

The plagiarism checker is very accurate, and I’m a huge fan of how Grammarly presents its findings. It’s more than just a spell checker — it tries to educate, which I really appreciate.

Grammarly is about more than making good edits, it’s trying to make good writers.

I think this is a sound investment for any professional writer, editor, or business pereson.

It might be a bit pricey for your average college student. But if they can afford it, I could see this being a tremendous tool to use in crafting your next term paper.

Two thumbs up. 👍👍

 

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