The Best Grammar Checker
I bought & tested 7. Here are the results.

Bad grammar is everywhere.

But it doesn’t have to be. And you don’t have to have a degree in English to make sure your grammar is on par.

All you need is a grammar checking tool.

A grammar checker can instantly improve your writing, whether you’re a professional writer who needs to check an article or you’re a student who just needs to double check an essay before turning it in.

Or maybe you just want to be sure that the latest email you’ve written is free of any silly spelling and grammatical errors before hitting “send.” You can even use them to verify your writing in a non-native language. And grammar tools can also help you advance within your career.

Research shows that professionals who earned one to four promotions over ten years made 45% more grammar mistakes than those who earned six to nine promotions within ten years.

The best part about most grammar checkers?

Most of them are cheap (or free) and easy to use! But which ones are the cream of the crop?

Luckily, we analyzed seven grammar checking tools so you don’t have to. Before we dive in, let’s analyze the criteria we use to “grade” each grammar tool.

How these 7 Grammar Checkers were Graded (And Compare)

We chose seven grammar checkers to grade, research and analyzing their pros, cons, and costs. Here are the top seven we found:

Grammarly

➋ Citation Machine

➌ Scribens

➍ LanguageTool

➎ Reverso

➏ GrammarCheck

➐ Grammarix

Here's my 13-point review process

1. Usability

Is the tool easy to use/does it have a solid user interface? Are similar issues grouped together to help the writer learn how they can avoid common mistakes and improve their writing?

2. Accuracy

Does the tool consistently uncover the same issues, such as commas, punctuation, misspellings, etc?

3. Sophistication

How well does it check for comma use, parts of speech, hyphens, or words that are used incorrectly although spelled correctly?

4. Concision

Can the tool measure conciseness and/or give the writer suggestions to write with more clarity?

5. Plagiarism

Does it offer a feature that checks for instances of plagiarism? If yes, how well does it work?

6. Limitations

Are there daily, weekly, or monthly word or page limits and/or or file/page upload limitations?

7. Grammar Rule Source

Does the tool offer up any information about how they check content? What type of grammar rules are used and from what sources? (e.g., APA, MLA)

8. Reporting

Does the tool offer a feature that allows users to export reports? If so, how useful are they, what’s on them, and what formats are available?

9. Device Compatibility

What devices does the tool work with? Does the tool offer a mobile app, a browser extension, or some kind of Google doc/Microsoft Word compatibility?

10. Human Reviews

Does the tool offer the ability for human review? If so, how does this feature work and how much does it typically cost?

11. Multilingual

Can you check grammar in different languages? If so, how many and which ones?

12. Customer Service

How well is the customer service provided by the grammar checker, if any is offered? Are multiple options available like live chat, email, or a knowledge base?

13. Plans and Pricing

How do these seven services line up?

Best Grammar Checker 2018 (Review)

Ideally, I want a simple, easy-to-use grammar checker that’s still accurate and sophisticated. Plus, I’d like one with plagiarism support so I don’t have to check the same document in multiple tools.

Advertising disclosure: If you sign up for any of these tools here through my links, I might earn a small commission. That’s how I’m able to fund these week-long reviews, and pay for each service, to review them in-depth and keep the site free for you.

CHECKER ACCURACY SOPHISTICATION PLAGIARISM MULTILINGUAL RATING
Grammarly Very good Very strong Yes No ★★★★★
Citation Machine Very good Very strong Yes No ★★★★
Scribens Good Good No No ★★★★
LanguageTool Good Good No Yes ★★★
Reverso Good None No Yes ★★★
GrammarCheck Good Good No No ★★
Grammarix Average Average Not really No

Now, let’s check out each one in detail so you can see how these grammar checkers were rated.


1. Grammarly

Grammarly offers AI-powered solutions to “help people communicate more effectively,” according to the About Us section of their website.

The cloud-based app is loaded with algorithms that flag potential text problems, while also suggesting corrections for users.

The tool can check for a large range of issues, like grammar, spelling, wordiness, style, punctuation, and plagiarism.

Here’s what makes Grammarly great, along with the major drawbacks of the service.

Grammarly Pros

#1. Grammarly is extremely easy to use. Simply copy, paste, and you’ll immediately start getting results.

You’ll even start get a brief breakdown about (a) what’s wrong and (2) why it’s wrong. So you’re less likely to keep making the same mistake!

#2. Grammarly’s grammar checker is also among the most sophisticated I tested. It catches a lot of the tiny details that often slip through the cracks, like passive voice.

#3. Online writing should be crisp and concise. Welp, Grammarly has you covered here, too. Their Conciseness feature will help simplify sentences and reduce redundancies.

This can be especially useful in formal writing situations, short emails, or blog posts and articles where writers need to get to the point quickly and efficiently without tons of extra fluff.

#4. Grammarly also boasts a built-in plagiarism checker that scans up to “16 billion web pages and ProQuest’s databases” for any issues.

Unlike other insights within the tool, plagiarism isn’t checked automatically. Users have to click the “Plagiarism” button on the bottom right hand of the screen.

Then, a percentage score out of 100 is given for how closely your text matches other sources.

The only catch? This feature is only available with a paid Grammarly plan.

#5. You can have Grammarly check any of the following five style guides:

  1. The Chicago Manual of Style
  2. APA 6th edition
  3. MLA for citation style guides
  4. Swan’s Practical English Usage
  5. The Cambridge Grammar of the English Language for grammar guides

#6. All free grammar check options are limited in some way, shape, or form. With some, you’ll hit that cap pretty soon. But you might not with Grammarly.

In a 30 day period, users can check up to 300 documents or up to 150,000 words. In a 24 hour period, users can check up to 100 documents or 50,000 words.

You can check up to 60 pages (or 100,000 characters with spaces included) at once. There are also no limitations with Grammarly for Microsoft Word and Outlook.

Documents cannot be larger than 4MB, but Grammarly supports Microsoft Word docs and Open Office docs, in addition to .txt and .rtf files.

These are much larger limit ceilings than most grammar checkers on the market offer.

#7. The whole point of a grammar checker isn’t just to fix one document or email. It’s to become a better writer.

Grammarly’s detailed reports can do just that:

And the reports include every insight given for your text, including your overall score, number of writing issues, and more.

The report even lists out the exact descriptions of each issue in your document.

#8. Grammarly doesn’t seem to have many device limitations.

It’s available on iOS, Android, a web or mobile browser, and via browser extension. Grammarly offers a browser extensions or Chrome, Safari, Firefox, and Edge browsers.

The Grammarly desktop app is also available for Mac or PC, and it’s compatible with:

  • Windows 7, Windows, 8, Windows 8.1, and Windows 10
  • macOS 10.9 and higher

With a Grammarly membership, users can access the tool on up to five different devices simultaneously.

#9. Grammarly also offers a simple, built-in way to get human proofreading. But they come at a small cost, depending on how fast you need your document returned.

It costs $0.03 per word to receive your document back in 24 hours, $0.08 per word to get your document back in three hours, and $0.11 per word to complete a human review in 30 minutes.

#10. Grammarly offers a 24/7 helpdesk service that’s available for registered users. All users can access the knowledge base and ticketing system.

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We sent in a customer support ticket to test Grammarly’s support quality and speed.

Sending in a request was simple: all the site needs is your email address and a brief description of your problem.

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Zach with Grammarly Support responded with a comprehensive answer in about 12 hours, which is about average, according to recent data.

Now that we’ve covered what’s great about Grammarly, let’s talk about the cons of the service.

Grammarly Cons

#1. No grammar checker will offer 100% accuracy. Grammarly is the most accurate one I’ve reviewed, but there are still a few issues from time to time. For example, in this case, the sentence should have read “your” instead of “you’re.”

#2. Grammarly does not support multilingual documents, only supporting English.

 

Grammarly Cost

While some Grammarly features are free, you’ll have to pay for access to all of the bells and whistles, like the plagiarism checker.

Monthly, Quarterly and Annual plans are available. Costs are as follows:

  • Monthly: $29.95 per month
  • Quarterly: $19.98 per month billed as one payment of $59.95 for three-month access
  • Annual: $11.66 per month billed as one payment of $139.95 for 12-month access

Available payment methods include:

  • Credit card
  • PayPal
  • Debit card (excluding for Visa Electron debit cards, Mastercard Maestro, and Interac)

Checks, money orders, and phone payments aren’t currently accepted.

Do I Recommend Grammarly?

Yes.

Grammarly is packed full of more features than most grammar tools out there.

Whether you need a grammar checker for academic, professional, or personal reasons, this one should have you covered.

If you’re a blog writer or you own a website, this tool is a great, comprehensive option that can help you take your content to the next level.

And the paid version is worth it, considering all of the sophisticated, advanced features that you’ll have access to.

That being said, if you need a grammar tool with multilingual capabilities, this one misses the mark entirely.

Try Grammarly Now Or read the full review →


2. Citation Machine

Citation Machine is considered a ‘works cited’ generator.

That’s fancy language for professional citation slayer. (Or something.)

But they also offer a grammar and plagiarism checker. So let’s see how it stacks up.

Citation Machine Pros

#1. Citation Machine is pretty. They’ll even give you a step-by-step walkthrough when you first sign up.

#2. Citation Machine’s grammar check is accurate, catching all of my (many) misplaced commas, for example.

#3. I really liked the citation creator integration, to help you catch all sorts of advanced grammar issues. Not only will it correct your actual text, but then it’ll seamlessly create a citation for said text that’ll get added to your bibliography in the background.

#4. Citation Machine has no issue flagging unnecessary, superfluous words.

#5. Citation Machine does offer a plagiarism checker (hallelujah!). But it is paid.

#6. Citation Machine is compliant with major style guides, including APA, MLA, and Chicago Style.

#7. If you’d like to see improvements in grammar, or plagiarism scores across the board, you can easily keep export reports from your account.

#8. There is no live chat available for Citation Machine. But, they do have a good knowledge base for your viewing pleasure.

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Citation Machine Cons

#1. Unfortunately, Citation Machine’s free version is extremely limited. There is no word count limit, but you’ll only get 20 suggestions (on any content piece).

#2. I was pleasantly surprised with Citation Machine. The underlying technology is actually pretty good. It’s just too bad that they don’t extend that functionality to anything other than your web browser.

#3. No human proofreading is available through Citation Machine. Neither is multilingual support.

Citation Machine Cost

A three-day free trial is available with this grammar checker. After that, it is $9.95 per month. It appears that Citation Machine only accepts credit or debit card payments at this time.

Do I Recommend Citation Machine?

Yes and no.

I think it’s a great option for students or educators. The built-in citation feature will be a lifesaver for you.

But for everyone else, it seems a little expensive considering the drawbacks and no annual discount (like Grammarly).

Try Citation Machine Now Or read the full review →


3. Scribens

Scribens is yet-another-free grammar checker.

Except, this time, they claim to fix over 10X what Microsoft Word picks up.

Scribens Pros

#1. I do like that Scribens makes it easy to spot the most common mistakes you make. It’ll also provide a little extra insight to each suggested fix.

#2. Scribens picks up on subtle mistakes, too. For instance, it caught an incorrect bracket I used in one section.

#3. Although Scribens doesn’t officially have a concision feature, it will recommend words to replace that will improve the clarity of each piece you write.

#4. I couldn’t find a daily word, symbol, or page limit. No cap to worry about!

#5. Scribens doesn’t go into detail on which specific style guides they use. However, they do allow you to select between British English or American English.

#6. Scribens has TONs of available apps. It’ll work with Chrome, Firefox, and Safari browsers. Plus, Windows, Excel, LibreOffice, OpenOffice, Google Docs, and more.

Scribens Cons

#1. Scribens’ accuracy was good, but not flawless. They missed a simple “their” during my tests:

#2. While Scribens covers most of your grammar options, there are unfortunately no plagiarism or reporting options available.

So you’re going to need to run all of your work through an additional tool.

#3. Scribens also doesn’t offer any human review, or multilingual support.

#4. There is a customer service form on Scribens:

The issue is that I couldn’t get the “Send” button to work. I even tried switching devices, without any luck.

Scribens Cost

Scribens is absolutely free.

Do I Recommend Scribens?

Yes and no.

Scribens is pretty bare bones. It does provide strong grammar options.

However, the lack of plagiarism, reporting, and customer service means what you see is what you get.

Grammarly offers all of those things, with a similarly-liberal free plan, so the decision should kinda a no brainer.

Try Scribens Now Or read the full review →


4. LanguageTool

LanguageTool is a grammar checker like the others on this list, but with a few interesting twists. Check it out.

LanguageTool Pros

#1. LanguageTool’s interface won’t let you down, providing a simple color-coded workspace directly on their homepage.

#2. I tried fooling LanguageTool a few times, giving it the same section of content to see if they’d slip up and miss anything. Well, they got the last laugh. They routinely corrected me, catching just about every potential hyphen opportunity imaginable.

#3. The free LanguageTool plan, meanwhile, allows up to 20,000 characters. That’s not as bad as some on this list, but you’ll probably hit the cap over the course of a few weeks if you use it religiously.

#4. LanguageTool is available on so many devices. Seriously. It covers most writing apps imaginable, including LibreOffice, Microsoft Word, Firefox, Chrome, and Google Docs. Plus, because it’s open sourced, you can also get a ton of different plugins that will add it to even more.

#5. Finally! LanguageTool does exactly what it sounds like — let you check grammar in many, many different worldwide languages.

#6. Last but not least, they have a forum for support, where other users will chime in with help or their experience.

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LanguageTool Cons

#1. LanguageTool caught the major grammar issues, but let a lot of little ones through its cracks. For example, it almost didn’t catch any of my passive voice examples:

#2. Unfortunately, there is also no plagiarism or reporting support. That’s a bummer, because it drastically reduces what you can use this tool for, and almost forces you to patch several different ones together. No one has time for that!

#3. LanguageTool’s accuracy seems legit. Except, it doesn’t really tell you which style guides are used. They also don’t support any human review through the platform.

#4. While LanguageTool offers a TON of different device options, many are reportedly not supported. So they might be hit or miss.

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LanguageTool Cost

You can pay monthly, quarterly, or annually for LanguageTool premium. Here’s the breakdown:

  • Monthly subscription: $19 per month
  • Three month subscription: $39 every three months
  • Yearly subscription: $59 every year

Do I Recommend LanguageTool?

Yes and no.

If you absolutely need multilingual support, look no further! This will be your best bet.

However, if you’re looking for a good all-around grammar checker, this one lacks some basic features like plagiarism or reporting.

Try LanguageTool Now Or read the full review →


5. Reverso

Reverso has a grammar checker, even though it’s usually best known as a translation tool. Does that hinder its performance at all? Let’s find out.

Reverso Pros

#1. Reverso will immediately highlight all improper words or punctuation after dropping in your content and hitting “Check.”

#2. Reverso is also pretty good at catching most basic issues, including punctuation problems or misspellings.

#3. Reverso was also one of the only options here that caught the correct “your” vs. “you’re” usage.

#4. Instead of basing their grammar grades off well-known style guides, they’re using their own Reverso-Softissimo translation software.

#5. Reverso offers a Chrome Extension to help check everything you write, on every site you visit.

#5. Reverso also offers a multilingual option to help fix your grammar mistakes in several different languages.

Reverso Cons

#1. There’s a lot to like about Reverso. But I was blown away by how limited their restrictions were. You can only check up to 600 characters at a time on their free plan! Unfortunately, you can’t even upgrade if you wanted to open up more access, either. You’re stuck here.

#2. Reverso offers zero support for both plagiarism and concision. Kinda disappointing, to be honest.

#3. You can’t have a human review or proofread your information through Reverso.

#4. Customer support comes in the form of a form (ha!).

Despite filling everything out, I never heard back. Bummer.


Reverso Cost

Reverso is a free service that uses ads to help pay for everything. You can, and should probably sign up for the free account, though, so you can track your old usage.

Do I Recommend Reverso?

Yes and no.

I liked a lot about Reverso. The accuracy was good, and the multilingual options were great.

Unfortunately, the severe restricted 600-character limit means this tool is only good for short sections of content.

Realistically, it’s probably going to be too limited for most people.

Try Reverso Now Or read the full review →


6. GrammarCheck

GrammarCheck sounds like a new grammar check option.

But once you dig below the surface, you’ll quickly realize it’s not. It’s a unique site, masquerading as a Grammarly clone, relying on their technology to power it.

GrammarCheck Pros

#1. Paste your info into GrammarCheck, and it’ll quickly return your results.

 

#2. Because GrammarCheck leverages Grammarly’s software, you’ll get access to the same best-in-class sophistication.

#3. Once again, you also benefit from GrammarCheck’s, err, Grammarly’s higher-than-normal restrictions for word count.

GrammarCheck Cons

Accuracy is Off

#1. We still saw some of the same inconsistencies with GrammarCheck, where “your” vs. “you’re” still threw it for a loop.

#2. GrammarCheck is able to coast off of Grammarly’s coat tails so far. But here’s where things start to fall off the rails.

GrammarCheck is unable to measure both conciseness and plagiarism. So you’re missing out on some key features.

#3. You’re also missing out on any potential human proofreading, too.

#4. GrammarCheck only has a web browser. There is no Chrome extension, app, or plugin of any kind.

#5. GrammarCheck does not offer any multilingual support.

#6. There are no customer services options, either. You don’t get the usual knowledge base content. And the content form is currently closed, meaning you can’t even get in touch with them if you tried.

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GrammarCheck Cost

GrammarCheck is mostly free. They do have a “Deep Check” option, but it’s pretty misleading. Instead of actually doing anything, it’s just going to redirect you straight to Grammarly Premium.

Do I Recommend GrammarCheck?

No, I don’t.

This grammar checker is pretty misleading, if we’re being honest. They’re not doing anything original, relying 100% on Grammarly’s free option.

You’re better off just bypassing this and going straight to the source.

Try GrammarCheck Now Or read the full review →


7. Grammarix

Grammarix prides itself on being a complete-free grammar tool. They even go so far as to boast that they “won’t attach a premium price tag” to their app.

But, is that a good thing? Do you want to save a few bucks, or do you want something that works properly?

Let’s find out.

Grammarix Pros

#1. The Grammarix interface is extremely simple. Paste the content, and you’re good to go.

Uh oh. Unfortunately, that’s all I have under the Pros column for Grammarix.

Here’s why.

Grammarix Cons

#1. ‘Free’ is good. But not when it jeopardizes accuracy or sophistication. And unfortunately, that’s exactly what happens with Grammarix.

In my tests, it missed both double punctuation issues and passive voice. (Stuff that Grammarly, despite it faults, easily caught each time.)

#2. Grammarix also badly misses concision, helping you to write with more clarity. This means, at best, you’ll need to run your content multiple tools.

#3. Technically speaking, Grammarix does have a plagiarism checker. However, if my tests are anything to go off of, it’s not very good.

I literally used a plagiarized copy of The Great Gatsby, and it came out completely clean. Huh?!

#4. Grammarix only allows you to check up to 2,000 symbols at a time. That’s super disappointing, considering 2,000 words is the average length for most of my content. That means you’d potentially have to run multiple checks on the same piece!

#5. Grammarly transparently tells you which databases they’re using to check your content. Grammarix, on the other hand, does not. You have no idea.

Plus, there’s also no reporting options, either. So you’re unable to get feedback on different pieces it checks.

#6. Grammarix is only available through a web browser. No other plugins, extensions, or apps available.

#7. No human proofreading or review options are available.

#8. No multilingual support, either. It’s trying to change Spanish to English!

#9. Grammarix does have a contact form available. But don’t expect to see anything from it. I fired off a message, received the standard confirmation reply, and have yet to receive a real response from the company (after over five days and counting).

Grammarix Cost

Grammarix is free, with no paid plans.

Do I Recommend Grammarix?

No, I do not.

‘Free’ can only get you so far. I’d MUCH rather pay a few bucks than miss out on accuracy, plagiarism, and even customer support.

Try Grammarix Now Or read the full review →


Conclusion

Most grammar checkers are either free or cheap. But there are tons out there to choose from. So how can you decide which one(s) are right for you?

If you’re looking for an easy-to-use, all-around option, look no further than Grammarly.

Opt for the paid version if you want the most sophisticated and advanced features.

Avoid GrammarCheck and Grammarix. GrammarCheck seems to be a site built from embedded Grammarly software. Skip the middleman and use Grammarly (or another tool) instead.

Grammarix has too many cons to make it a real competitor in the grammar checking space.

If you just need a basic, plain Jane checker for everyday use, opt for Scribens. It’s free, so you aren’t risking anything to try it out.

Citation Machine is best for students and educators. If you need to analyze your latest paper or get some assistance grading students’ writing, try this tool.

If you decide you want to use it long term after trying it out, commit to the premium upgrade.

If you’re looking for a multilanguage grammar checker, LanguageTool or Reverso are wonderful services.

LanguageTool is compatible with more languages than Reverso, and has fairly high limitations. Reverso is great for checking small bits of text, like emails.

Now that you know which of these grammar checkers is the best one for you based on your needs, what are you waiting for? Try it out and boost your writing now.