4.5 out of 5
Picks up most errors
3.5 out of 5
Premium plan $139.95/year
ease of use
4.5 out of 5
Pop-up suggestions, color-coded alerts
4 out of 5
Knowledgebase, ticketing system

Quick Summary

How many times have you pressed Send on an email or Publish on a blog post, and immediately noticed a mistake? Why couldn’t you see it earlier? Grammarly promises a fresh pair of eyes to look over your document and pick up on things you may have missed.

It’s much more than a basic spell-check. It will check for a range of English grammar and punctuation errors, taking context into consideration. For example, it will suggest you change “less errors” to “fewer errors,” pick up misspellings of company names and suggest readability improvements. It’s not perfect, but it is incredibly helpful. And you get much of that for free.

A premium version that’s even more helpful is available for $139.95/year (or $150/year/user for businesses). Here’s how the free and premium plans differ over five significant areas:

  1. Correctness: The free plan corrects grammar, spelling, and punctuation. The premium plan also checks for consistency and fluency.
  2. Clarity: The free plan checks for conciseness. The premium plan also checks readability.
  3. Delivery: The free plan detects tone. The premium plan also detects confident writing, politeness, formality level, and inclusive writing.
  4. Engagement: isn’t included in the free plan, but the premium plan checks for compelling vocabulary and lively sentence structure.
  5. Plagiarism: is only checked for with the premium plan.

Unfortunately, Grammarly isn’t available everywhere you write. Still, most people will find a way of bringing it into their writing workflow. It runs in your web browser and works with Google Docs. It works with Microsoft Office on Windows (but not Mac), and Grammarly Editor apps are available for both Mac and Windows. Finally, a Grammarly keyboard for iOS and Android allows you to use it with all of your mobile apps.

It certainly won’t replace a human editor, and not all of its suggestions will be correct. But it’s likely to pick up errors you missed and make useful tips to improve your writing. Is it for you? Read on to find out.

What I Like
  • Easy-to-use interface
  • Fast and accurate
  • Usable free plan
What I Don't Like
  • Expensive
  • Few apps supported
  • Must be online


Overall Rating: 4.1 out of 5
Web-based, Freemium

Quick Navigation

// Why Should You Trust Me?
// Grammarly: What’s In It For You?
// Reasons Behind My Ratings
// Alternatives to Grammarly
// Conclusion

Why Should You Trust Me?

I’ve always been good at proofreading, and when I was a student, I’d often submit a list of errors in the training manuals so they could be corrected for future classes. I worked as an editor for five years and never felt like I needed any help from an app.

But I’m highly aware that when reviewing my own work, I can allow mistakes to slip through more frequently. Perhaps that’s because I know what I meant to say. There’s also the issue of Australian spelling differing from US spelling.

When I started writing for SoftwareHow, I was always impressed with how many small errors JP picked up when editing my work. It turns out he was using Grammarly. He’s a good editor without the program, but even better with it.

So about a year ago, I started to use the free version of Grammarly. I don’t use it as I write—worrying about little mistakes at that stage will stall my momentum. Instead, I leave it until the final stage of my writing process, just before I submit my work.

I’ve been evaluating grammar checkers since the 1980s and never found them very helpful. Grammarly is the first one that I discovered that I actually find useful. Until now, I’ve only used the free version, but now that I’ve tasted the premium version while writing this review, I’m seriously considering subscribing.

Grammarly: What’s In It For You?

Grammarly is all about correcting and improving your writing, and I’ll list its features in the following six sections. In each subsection, I’ll explore what the app offers and then share my personal take.

1. Grammarly Checks Your Spelling and Grammar Online

Grammarly offers browser extensions for Google Chrome, Apple Safari, Firefox, and Microsoft Edge. It will check your grammar when filling in web forms, doing email, and more. The Chrome extension offers advanced support for Google Docs, but it’s currently in beta.

It’s been quite stable for me over the last year. There were a few weeks when it would crash Google Docs (thankfully without data loss), but that problem has been resolved.

If you have a very long document, Grammarly won’t check it automatically. You need to click the icon at the bottom of your screen and activate it manually.


The free version of Grammarly picks up a variety of mistakes, including basic typing errors.


You can make corrections with a single click to a suggested word. Unlike the Premium plan, you’re not given an explanation of what you did wrong.

I generally write in US English, but quite often, my Australian spelling slips through anyway. Grammarly helps me pick up on this.


Better still is when Grammarly picks up spelling errors based on the context that other spell checkers may miss. Both “some” and “one” are in the English dictionary, but Grammarly understands that the right word for this sentence is “someone.”


The same with “scene.” It’s a valid word, but incorrect in context.


But not all of its suggestions are correct. Here it suggests I replace “plug in” with the noun “plugin.” But the original verb was actually right.


Grammarly’s real strength is identifying grammatical errors. In the following example, it realizes I’ve used the wrong case. “Jane finds the treasure” would be right, but the app realizes that “Mary and Jane” is plural, so I should use the word “find.”


I appreciate when the app picks up more subtle errors, for example, using “less” when “fewer” is correct.


The app helps with punctuation, too. For example, it will tell me when I’ve used a comma that shouldn’t be there.


It tells me when I’ve missed a comma, too.


I know that not everyone uses the “Oxford” comma at the end of a list, but I’m glad the app made the suggestion. Grammarly can be quite opinionated! Just take the alerts as suggestions.

Besides Google Docs, the other place I most value Grammarly when I’m online is composing emails in a web interface such as Gmail. Not all emails need Grammarly—you don’t need perfect grammar in an informal email. But some emails are particularly important, and I appreciate that Grammarly is there when I need it.

My personal take: My primary use of Grammarly so far has been online: checking documents in Google Docs and emails in Gmail. Even when using the free plan, I’ve found the app incredibly helpful. When you subscribe to the Premium plan, the extra features will automatically appear, and we’ll explore those below.

2. Grammarly Checks Your Spelling and Grammar in Microsoft Office

You can use Grammarly in your desktop word processor, too, as long as you use Microsoft Office, and as long as you run Windows. Fortunately, that’s an app that a lot of people use, but I hope that they improve support for other desktop apps in the future. Mac support would be appreciated, as would support for other word processors like Pages and OpenOffice.org, and writing apps like Scrivener and Ulysses.

Grammarly’s Office plugin allows you to use the app in Word documents and Outlook email. Grammarly icons will be available in the ribbon, and you will see suggestions at the right of the screen.


Image: Grammarly

If you use a different word processor, you’ll have to paste or import your text into Grammarly. You can use the web interface at Grammarly.com, or their Editor app for Windows or Mac (see below). Rich text is supported, so you won’t lose your formatting.

My personal take: Many people choose Microsoft Word as their word processor. If that’s you, and you’re a Windows user, you can use Grammarly from within the app. Unfortunately, if you use a different app, you’ll have to find a workaround. Typically, that involves copying or importing your text into Grammarly manually.

3. Grammarly Checks Your Spelling and Grammar on Mobile Devices

Grammarly is available as a keyboard on both iOS and Android. It’s not as pleasant an experience as with Grammarly’s other interfaces, but it’s not bad.

I find this the most convenient way to use Grammarly with Ulysses, my favorite writing app. I can’t use it from within the Mac version of the app, but all of my work is available synced to my iPad where I can use the Grammarly keyboard.

I copied the test document I used in Section 1 (above) from Google Docs into Ulysses and used the iOS Grammarly keyboard to check it. The keyboard section of my iPad displays a series of cards explaining each error and allowing me to make the correction with a single tap. I can swipe left or right to navigate the cards.

Like the web version, it identifies spelling mistakes based on context.


It recognizes a large number of proper nouns, including company names.


It identifies incorrect grammar.



It also identifies problems with punctuation.


If I use the Grammarly keyboard to type the document, it will make suggestions in real-time.


My personal take: By providing a mobile keyboard, Grammarly can work with all of your mobile apps, whether on iOS or Android.

4. Grammarly Provides A Basic Word Processor

It seems that many users don’t just use Grammarly to check their writing, they use it to do their writing as well. Grammarly’s web and desktop apps offer basic word processing features. You need to be connected to the web to use the apps—they don’t have an offline mode at this time.

I’ve never used Grammarly’s editor before, so I downloaded it and installed it on my iMac, then logged into a premium account. It’s the first time I’ve tried the premium features, too. It’s a basic word processor that offers all of Grammarly’s features as you type. Rich text formatting is available, including bold, italics, underline, two levels of headings, links, and ordered and unordered lists.


A word count is displayed at the bottom of the screen, and clicking on it gives additional statistics.


The language can be easily switched between American, British, Canadian, and Australian English.


One unique feature is its goals. Writing apps like Scrivener and Ulysses help you track word count goals and deadlines, but Grammarly is different. It wants to know about the type of audience you are writing for, how formal the document should be, and its tone and intent. The app can then give you input on how to more effectively communicate your purpose to your intended audience.


Grammarly can import Word and OpenOffice.org documents, as well as text and rich text, or you can simply copy and paste directly into the app. I imported an old Word document and set some goals. The app immediately notified me that I can see synonyms of a word simply by double-clicking it. That’s handy!



The rest of the app’s features focus on Grammarly’s core strengths of correcting and improving your writing, and we’ll look at those below.

My personal take: Grammarly’s editor offers enough editing and formatting functionality for most writers. But the real reason to use the app is Grammarly’s unique correction and suggestion features, which we’ll look at next.

5. Grammarly Suggests How to Improving Your Writing Style

I’m interested in Grammarly’s premium features, particularly those that promise to improve the readability of my writing. The app splits its suggestions (alerts) into four categories:

  • Correctness, marked in red,
  • Clarity, marked in blue,
  • Engagement, marked in green,
  • Delivery, marked in purple.


There are 88 red “Correctness” alerts for my document, indicating problems with spelling, grammar, and punctuation as we looked at in Section 1 above.

I receive high scores for “Clarity” and “Delivery,” but not “Engagement.” Grammarly finds the article “a bit bland.” I’m curious to see how it recommends I spice up the content, so I scroll down looking for suggestions marked in green.

I come to an alert about the word “important,” one that Grammarly warns is often overused. It suggests I use the word “essential” instead. That makes my sentence sound more opinionated, and I guess that’s spicier. Clicking on the suggestion makes the change.


The same goes for the word “normal,” though the suggested alternatives don’t seem any more engaging.


Grammarly doesn’t just look for words that are overused in general, it also considers words that are used repeatedly in the current document. It identifies that I’ve used “rating” frequently, and suggests using an alternative.


When checking for clarity, the app shows me where something can be said more simply, using fewer words.


It also warns when a sentence may be too long for the intended audience. It suggests that any unnecessary words be removed, or that you split the sentence in two.


My personal take: This has been my first real look at Grammarly’s premium features. I appreciate that it evaluates my document in several ways, and uses different colors to differentiate between the different types of suggestions. I found many of its recommendations useful. For example, when writing a lengthy article you may not notice that you’ve used a word too frequently, but Grammarly will let you know.

6. Grammarly Checks for Plagiarism

Grammarly detects plagiarism by comparing your document with billions of web pages and ProQuest’s academic databases. You get an alert when your text matches one of these sources. The feature was designed for students but is useful for any writer who wants to make sure their work is original. That’s especially important when publishing to the web, where takedown notices are a real risk.

To test this feature, I imported two long Word documents, one that contains several quotes, and one that doesn’t contain any. In both cases, the plagiarism check took less than half a minute. For the second document, I received a clean bill of health.


The other document had major plagiarism issues. It was found to be virtually identical to an article found on the web, but that turned out to be where my article was published on SoftwareHow. It’s not 100% identical because some changes were made before it was published.


Grammarly also correctly identified the sources of all seven quotes found in the article. Checking for plagiarism isn’t foolproof, however. I experimented by blatantly copying and pasting text directly from some websites, and Grammarly sometimes incorrectly assured me that my work was 100% original.

My personal take: In our current climate of copyright concerns and takedown notices, Grammarly’s plagiarism checker is an invaluable tool. While not foolproof, it will correctly identify most copyright infringements contained in the text.

Read on to find out why I gave Grammarly the ratings as shown above.

Reasons Behind My Ratings

Effectiveness: 4.5/5

Grammarly brings together a spell checker, grammar checker, writing coach, and plagiarism checker in one helpful app. Most of its suggestions are useful, accurate, and go beyond pointing out errors to improving your style and readability. However, I wish that more word processors and writing apps were supported.

Price: 3.5/5

Grammarly is a subscription service and an expensive one at that. While the free version is quite useful, writers who want to access all of its features need to pay $139.95/year. Some other grammar checkers are similarly priced, but this cost is more than a Microsoft Office 365 Business subscription. Many potential users may find that excessive.

Ease of Use: 4.5/5

Grammarly highlights words that need your attention with a color-coded underline. When hovering your mouse over the alert, suggested changes are displayed along with an explanation. A single click will make the change. The total number of alerts and clearly displayed on the page, and navigating between them is easy.

Support: 4/5

Grammarly’s Support Page offers a comprehensive, searchable knowledgebase that deals with billing and accounts, troubleshooting, and the use of the app. If further help is needed, you can submit a ticket. Phone and chat support are not available.


Alternatives to Grammarly

ProWritingAid ($70/year, $240 lifetime) checks your grammar, helps improve your style, checks for plagiarism, and acts as a writing coach. It’s Grammarly’s closest competitor and works on the web (including with Google Docs), and on the desktop with Microsoft Office and Scrivener (on Mac and Windows). It’s also included with a $10/month Setapp subscription.

Ginger Grammar Checker ($150/year) is a grammar checker that works on the web, with Microsoft Office, and on Windows, Mac, iOS, and Android.

WhiteSmoke ($79.95/year) is an English writing tool for the web, Microsoft Office, Windows, and Mac.

StyleWriter 4 (Starter Edition $90, Standard Edition $150, Professional Edition $190) is a plugin for Microsoft Word that offers plain English manuscript editing.

Hemingway Editor is a free web app that will help you improve the readability of your text. A desktop version is available for Mac and Windows for $19.99.

After the Deadline is an open source app that’s free for personal use. It includes contextual spell checking, advanced style checking, and intelligent grammar checking.


Grammarly is the most helpful grammar checker I’ve ever used. In fact, so far it’s the only one I’ve found worth using. Its functionality goes well beyond my expectations and includes:

  • context-sensitive spelling, grammar, and punctuation corrections,
  • checking for conciseness and readability,
  • suggestions on how to improve your writing, taking tone, confidence, politeness, formality, and inclusiveness into account,
  • advice on how to make your writing more compelling and engaging,
  • checking for plagiarism, and identifying the original sources the text was copied from.

I’ve found the free plan to be functional and helpful. Now that I’ve had a taste of the premium version, I’m seriously considering subscribing. The only question is whether it provides enough value for money. A yearly subscription of $139.95 per year is quite expensive, so you need to decide whether it offers enough value to you.

Casual writers will find the free plan helpful and can use their experience with the app to gauge whether they want to pay for additional help. Once the company has your email address, they’ll let you know when you can subscribe at a discount. There are regularly half-price offers.

But when the accuracy and effectiveness of your writing really counts, Grammarly offers genuine peace of mind. It won’t replace a human editor, and not all of its suggestions should be followed. Still, based on its alerts, you’re likely to make corrections and improvements to your text that you wouldn’t have made otherwise.

Many professional writers rely on it and consider it a useful tool. I recommend you give it serious consideration.

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