The AI grammar checker uses AI technology and natural language processing methods to analyze and correct documents. They identify and correct errors in spelling, grammar, punctuation, and syntax, and provide advice on writing style and word expression.
Whether you're preparing to submit your academic ** to your professor, or you're going to deliver your work report to your boss's desk flawlessly, or you're writing your first one**, these grammar checking tools can improve the quality of your manuscript. However, with the market currently flooded with countless paid and free AI grammar checking tools, how should you choose?
This article lists some of the most popular grammar checking tools and compares their features as objectively as possible. The last section of this article explains our methodology for evaluating the instrument. If you want to choose a credible grammar checker tool, read on and you'll find the tool you want.
Wordvice AI English grammar checker finds and corrects grammatical, punctuation, and word choice errors in academics**, assignments, business emails, and other English documents. It also suggests improvements to vocabulary, tone, and writing style, providing easy-to-understand explanations and feedback to help writers improve their writing. In addition to the above grammar checking function, it is actually a comprehensive AI document editing tool, as well as an AI English article rewriting and paraphrasing tool, an AI summary article extraction and summary tool, an AI multilingual translation tool, and an AI **plagiarism checking tool. These tools can all be used on their own. This means that authors have complete control over how much they modify their manuscripts. In addition, Wordvice's editorial team also provides professional editing services so that authors who wish to have their manuscripts manually checked by a professional before submission.
Grammar check quality: High
Wordvice AI English Grammar Checker detects all errors in the following test documents and provides detailed explanations for changes. It also suggested how to improve the wording to make the document clearer. It also gives hints where human input is needed to decide on nuances.
Availability and **
The Wordvice AI grammar checker has a clean, straightforward, and easy-to-use interface that can be used in just a few seconds after completing a simple membership registration. So, the writer can simply copy-paste the sentence into the text box and get the desired result. It is recommended to try all of the above tools. What's really powerful about this tool is that it offers different levels of editing modes (depth levels), including light, standard, intensive, and concise, and can be adapted to different types of manuscripts (e.g., academic, business, creative, etc.). Some of these editing modes (depth levels) are available for a fee. However, it's cheap, only $9 per monthUS$95 (RMB67) (annual purchase.) US$95 (RMB108) (Semi-annual purchase.) US$95 (RMB138) (monthly purchase).
ProwritingAid isn't perfect in terms of features. In our tests, it was able to find some document errors, but when it was revised, it introduced new ones. It also randomly labels words as "business jargon" that should be avoided. In fact, the test manuscripts we provide are already highly academic and formalized. In addition, it repeatedly tells the user that a sentence is too complex without providing a solution, or even if the sentence contains grammatical errors, it does not provide a corrective solution.
Grammar check quality: Low
This tool can only identify the simplest mistakes, such as verb form errors, and it is easy to mix in new mistakes in the revision suggestion and cannot provide a clear explanation or modification instructions.
Availability and **
This tool comes with a browser extension. However, its software interface is crowded, and it's distracting. Moreover, users have no way of knowing how the mystery score it displays came about.
The free version of the tool allows you to use all the built-in grammar tools, but you can't limit the length of your document to 500 words. Its paid version requires a monthly payment of €10 (annual), or €30 per month (monthly). This paid premium version has no word limit and offers a range of extra features, from useful features like checking in-text citations to some mystery features like comparing your work with works by writers of different genres.
Whitesmoke seems to be a tool trusted by many universities and companies before 2023 to check for many grammar problems, long and monotonous sentences, tense transition problems, and a translator capable of translating into 55 different languages. However, there seems to be better tools out there after 2023, and in our tests, Whitesmoke didn't perform flawlessly. In terms of fees, it doesn't offer a trial version or trial period. The product demo is also too simplistic to really give an idea of what the software can do.
Grammar check quality: Medium
The web-based demo version of the software did correct most of the errors in our test documentation, but it also misreported some places. In order to be able to see a detailed explanation of grammar correction, users must register and purchase the paid version.
Availability and **
The web version of WhiteSmoke works on all common web browsers. It makes it easy for users to correct mistakes with one click, and offers tutorials and more than 100 templates for a variety of writing projects. The only problem is that, as mentioned earlier, users can't try it out before signing up for the paid version. Users can choose between a web, basic, or advanced desktop version. The online version of ** is an annual purchase of 59$95, which translates to about $5 per month. The basic version of the ** is an annual purchase of 79$95, which translates to about $6 per month$66. The premium desktop version is an annual purchase of 137$95, which translates to about $11 per month$50.
Everyone has heard of Grammarly. It is currently used by about 20 million people worldwide. It's so popular for a reason, just as it performed so well on our test scripts. The tool has a clean look and makes suggestions that are understandable and easy for users to understand, ensuring that the revised text accurately conveys the original meaning. In addition, it is able to recognize many technical terms, including abbreviations and acronyms, without mislabeling them.
However, there are significant differences between the free and paid versions in terms of features. Not only does the free version offer fewer features, but it also has a weaker ability to identify and fix errors, i.e., the free version only flags errors that can be fixed, but can only be corrected when the user registers and purchases the paid version.
Grammar check quality: High
Grammarly is able to catch all grammatical mistakes. When users want to see explanations, it lets you sign up for a paid account. It allows users to choose the level of formality of the document and the type of reader. Some of these features are also only available in the paid version.
Availability and **
Grammarly is compatible with all commonly used browsers and Microsoft Office. Its interface is clean and easy to understand. However, the time to correct errors is a bit too long, as each correction requires two clicks from the user. All errors can only be corrected by the user after registering a paid account. The paid version is $29 per month$95 (Monthly.) $98 (Quarterly.) $66 (annual purchase).
Quillbot can be tried out without signing up and offers a lot of built-in tool features, although most of these features are only available in the paid version. On our test draft, it performed well and corrected all errors. However, it does not provide any explanations or recommendations. Since its output is generally accurate, users can trust it and feel comfortable using the "fix all errors" button, which is really convenient.
Grammar check quality: High
Quillbot effectively corrects any grammatical errors in your document. While it doesn't explain much and doesn't offer advice on improving your writing in terms of clarity or fluency, the overall quality of the edited manuscript is good.
Availability and **
Quillbot's interface is clean and friendly, and there is no unnecessary information to distract users. It offers browser extensions, and the "fix all errors" button saves users a lot of time. Users do not need to sign up for a trial. However, for manuscripts with more than 125 words in English, users need to upgrade to the paid version if they wish to get writing advice, which costs $8 per month$33 (Annual.) $33 (semi-annually) or $19$95 (Monthly.)
The Hemingway app is named after the American writer Ernest Hemingway, known for his simplicity and "muscular" writing style (imaginative, vivid style). As the name suggests, this tool not only checks grammar but also ensures that there are no lengthy and unnecessary complex sentences. It comments on the user's use of adverbs and passive voice, suggests alternatives, and flags complex sentences so that the user can split the sentence for reorganization.
Grammar check quality: Low
The tool is impressive in its ability to suggest clear wording, and the edited manuscript is really very fluid. However, it didn't pick out some even very simple errors in our test text. It simply corrects grammatical errors that happen to appear in long sentences that it would otherwise want to rewrite. Its correction feature is only available in the paid version.
Availability and **
This browser-based software is free. However, users are likewise required to register. It lists useful statistics such as the number of times the passive voice is used and the number of sentences that are difficult to read. Its interface is relatively clean overall. However, only paid Editor Plus editions flag issues in documents. The paid version is $10 per month (monthly purchase) or $8$33 (Annual.)
GrammarCheck is at a mediocre level in terms of functionality. It corrected about half of the errors in our test manuscript and didn't introduce new ones. It then directs users to Grammarly for an in-depth examination in order to identify some writing errors that are difficult to spot. It does not require user registration and is simple and straightforward to use. However, its features are very basic and it seems to lack some utility.
Grammar check quality: Medium
The tool was able to correct a large number of errors in our test documents, but ignored a lot of others. It only seems to be able to handle very basic grammatical correction issues.
Availability and **
Users don't need to register, just copy and paste the text into the dialog box and click "Free Check". Users can accept all the changes with one click, which can save a lot of time. The "Deep Check" button directs the user to Grammarly.
LanguageTool performed well on our test documents, recognizing most, but not all, spelling, word choice, and punctuation errors. However, it does require the user to go through multiple clicks to correct the error, which makes the whole modification process a bit tedious as there is no "one-click fix" feature. The tool will also alert you to some other issues, but it won't explain what they are unless you sign up for a paid account. This tool does offer to rephrase sentences based on AI suggestions, but we found that the rephrasing was too verbose and the writing style was inconsistent.
Grammar check quality: Medium
Most of the errors in our test documentation were identified and corrected by the tool, but some (even simple mistakes, such as the wrong article) were not. When we asked the tool to rewrite the entire sentence, there were no grammatical errors, but the sentence was too verbose and many of the changes were unnecessary.
Availability and **
The software requires no registration to use, and getting started is quick and easy. The software** has a clean user interface and offers browser extensions. However, users need to click twice to correct the error. To view some flagged issues, you need to purchase a paid version. The paid version offers Microsoft Office plug-ins and a customized writing style guide. The paid version is $59 per year (annual purchase, equivalent to $4. per month.)$99), $39 per quarter$90 (quarterly purchase, equivalent to $13 per month.)$30) or $19 per month$90 (monthly).
Ginger didn't perform well on our test draft. It only flags and corrects less than half of the errors. Even more lethal, it only accepts very short documents (up to 450 English characters) as input material, ignoring anything beyond that length unless the user buys a paid version. This makes the tool unsuitable for academic manuscripts.
Grammar check quality: Low
Ginger only found some bugs in our test documentation, at least in the free version. We didn't sign up for an account to test the features of the paid version.
Availability and **
The tool comes with a browser extension and automatic input correction. However, if the manuscript is longer than 450 characters, users will need to register for a paid account to use it. The paid version claims to have all bug fixes, can handle longer manuscripts (5,000 English characters), and can be translated into more than 40 languages. The paid version is $6 per month$99 (Annual.) $19 (quarterly purchase) or $13$99 (monthly).
While Wordtune does a pretty good job of finding and correcting the number of errors, it's actually more of a paraphrasing tool than a standard grammar checker. Users need to go through the bugs one by one, making a lot of clicks – which is a bit tedious. Moreover, the tool does not provide any explanation for the errors pointed out.
If you allow the tool to completely rewrite sentences, it will provide a list of suggestions. These suggestions may seem good at first, but they may be far from the structure of the original text, and occasionally change the meaning of the manuscript. For this reason, we don't recommend using Wordtune for grammar checking, especially for non-native English speakers and authors who aren't very proficient in English. However, it is a great revision tool for writers who already have advanced writing skills to improve the tone and flow of their manuscript.
Grammar check quality: Medium to high
This tool was able to correct most of the errors in our test documents. However, some corrections changed the intent of the manuscript. Therefore, Wordtune should only be used as a writing style tool, and only for authors with a high level of English proficiency.
Availability and **
Users need to create an account to use Wordtune. The free version has certain feature limitations. "To unleash the power of AI and take reading and writing to the next level" (its slogan), the paid version of Wordtune includes $9 per month$99 for the Plus version and $14 per month$99 unlimited version.
As shown above, we provide the same 150-word document for different grammar checking tools. Documents contain many errors in grammar, spelling, word choice, and punctuation. Based on this, we compared different grammar checking tools and also looked at the overall usability, speed, number of error correction clicks, account registration requirements, interface clarity, user-friendliness, etc.
On the Wordvice AI Blog**, you can read more critical articles about AI-assisted English writing tools, including the best article summary tools, the best AI research writing tools, and the best AI ** writing tools. You're sure to find the best English writing aid for you!