Best Run-On Sentence Checker: 12 Top Options

Are you looking for the best run-on sentence checker? Check out the top options available, and find the best one to enhance your writing skills.

In high school English class, you learned many basic grammar rules and even how to analyze a sentence. For example, you might have studied sentence fragments and dependent clauses, the problems with a comma splice, and when fused sentences make sense. However, even though complete sentences come in many shapes and forms, run-on sentences can detract from your work.

The software can help solve that problem. I’ve spent months testing various tools to help with rewriting, revising and editing sentences. These selections are suitable for writers of all types

Quick Summary: Our Top Picks For Run-On Sentences Checker
IMAGE PRODUCT  
Grammarly logo
Grammarly
  • Extremely easy to use
  • Automatically fix run-on sentences for you
  • Has a 20% discount
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Prowritingaid logo
ProWritingAid
  • If there is a free trial of the premium version
  • It will highlight repetitive phrases, helping you improve your writing style
  • Has a 20% discount
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Here Are The Top Run-On Sentence Checkers

1. Grammarly

Pricing: Free version available. $29.99 per month after that
Use for: Those looking for a comprehensive app for sentence structure

Grammarly desktop app
The Grammarly desktop app is powerful and fast

If you are looking the most powerful sentence checker on the market, that’s Grammarly. Whether you are writing an email, a social media post, or a blog post, this sentence checker automatically check your sentences to see if you have any sentence fragments, semicolon issues, problems with coordinating conjunctions, or run-on sentences. Then, provides a few automatic suggestions.

A free and premium version is available. The premium version is one of the best apps for sentence structure. The AI-powered writing assistant can propose full sentence revisions at a click, which you can accept or reject. It can also  automatically help you correct run-on sentences. 

Pros
  • Extremely easy to use
  • Automatically fix run-on sentences for you
  • Explains the mistakes to you as well
  • Includes a plagiarism checker
Cons
  • It can be expensive for the top-tier plans
  • The program sometimes “fights with itself” and can’t decide what is right
  • There is no free trial for the premium version

2. ProWritingAid

Pricing: Free version available. $20 per month after that
Use for: Those looking for feedback on longer pieces

Real-time grammar checker ProWritingAid-min
ProWriting Aid can catch most sentence issues and mistakes

ProWritingAid has become popular with novel writers, as it is more suited for long sentences. In addition, it takes a data-driven approach to online proofreading that many expert writers enjoy. Another significant benefit is that the free version has many premium features. Therefore, it may be more cost-effective for those on a budget. Read our ProWritingAid review to learn more. 

Pros
  • If there is a free trial of the premium version. 
  • It will highlight repetitive phrases, helping you improve your writing style.
  • It is compatible with Google Docs, MS Office, Mac, and Windows.
  • It will catch nearly all grammar mistakes.
Cons
  • There is no mobile app available.
  • The premium version is costly.
  • Finally, learning how to use it can take longer than other options.

3. Quillbot

Pricing: Free version available, Premium is $20 per month 
Use for: Those looking for help paraphrasing

Quillbot grammar checker
The Quillbot grammar checker is easy to use

Quillbot is a popular app for sentence structure. It also includes a grammar checker, a plagiarism checker, and a paraphraser. This is a solid option if you want to avoid revise, rewrite, summarize or shorten sentences. A free version is also available, but it is a relatively limited sentence checker app. Use the premium version. Read our Quillbot review to learn more.

Pros
  • It comes with a lot of excellent AI tools
  • More affordable than other options
  • Paraphrasers can help you avoid plagiarism and run-ons
Cons
  • The free version is minimal
  • It is better for short documents than long ones
  • You might not need all the features paid for in premium

4. Hemingway App

Pricing: Free version available, Premium is $19.99.
Use for: Those targeting a specific reading level

Hemingway Editor
Hemingway will also label many other issues, such as passive voice problems, that you can correct. It is a comprehensive self-editing tool for fixing flabby sentences

If you need a tool to help you catch run-on sentences, Hemingway can do the job. It will also label many other issues, such as passive voice problems, that you can correct. It is a comprehensive self-editing tool for fixing flabby sentences.

While it has many helpful features, it will not provide automated suggestions. Therefore, it is not as quick as some of the other tools available. However, if you need to target a specific reading level, Hemingway can help you do that. Read our Hemingway App review to learn more.

Pros
  • It has a comprehensive translator that can handle more than 60 languages
  • Exceptional for correcting syntax and word choice
  • Compatible with websites such as Google from, Microsoft Word, and Firefox 
  • It comes with a personal dictionary
Cons
  • The grammar checker is not as robust
  • It may not catch every run-on sentence 
  • You must hover over your grammar and spelling mistakes to see them

5. Writer.com

Pricing: from $18 per month
Use for: Fixing sentences and other issues as part of a team

Writer.com-grammar-checker
Writer.com includes a grammar and plagiarism checker

Writer.com is an aspiring Grammarly competitor. It contains several similar features, including a grammar and plagiarism checker. You can also use it to fix common structural issues with sentences. Although cheaper than Granmarly, it lacks the same ability to rewrite sentences and apply multiple suggested changes at a click. Read our Writer.com review to learn more. 

Pros
  • Affordable
  • Easy to use
Cons
  • Not as powerful as Grammarly
  • More suited for busineses writers

6. Ginger

Pricing: $13.99 per month
Use for: Those who need help with syntax and word choice

The Ginger grammar checker
The Ginger grammar checker will catch a lot of run-on sentences is not as advanced as some of the more dedicated grammar-checking tools

Even though there is a free version of Ginger, it is minimal. What truly makes this tool special is that there are a lot of advanced features at higher levels. For example, a grammar checker that will catch a lot of run-on sentences is not as advanced as some of the more dedicated grammar-checking tools. It’s quite out of date these days, though. To learn more, read our Ginger vs Grammarly comparison

Pros
  • This is a comprehensive editor that will catch a wide variety of issues
  • The free version is very comprehensive
  • It can help you target a specific reading level
  • It can serve as a valuable complement to a more comprehensive sentence fixer or sentence structure checker
Cons
  • It will not provide automated suggestions for your run-on sentences
  • It does not provide any comprehensive writing reports
  • May not catch basic sentence errors

7. WhiteSmoke

Pricing: Starts at $5 per month
Use for: Non-English speakers looking to save money

Whitesmoke proofreader
Whitesmoke can help you catch issues with run-on sentences and is compatible with Firefox, Safari, and Google Chrome

WhiteSmoke is an online tool that has been out for more than 20 years, and you can use it to catch a variety of punctuation, spelling, and grammar issues. It can help you catch issues with run-on sentences and is compatible with Firefox, Safari, and Google Chrome. It is also available on IOS and Android and supports fixing sentence structural issues in multiple languages. We preferred Grammarly, though. To find out why, read our Grammarly vs Whitesmoke comparison. 

Pros
  • It is one of the most affordable options available
  • It is straightforward to use, including for non-English speakers
  • It is an accurate sentence corrector
Cons
  • It does not automatically fix all of your grammar errors
  • The user interface is very outdated and can be a bit clunky
  • It is slower than some of the other, more advanced programs on the list

8. Microsoft Editor

Pricing: Included in Office 365
Use for: Editing within Microsoft Office apps

Some versions of Microsoft Editor provide suggestions for fixing sentences too

Another option to consider is Microsoft Editor. It comes bundled with any Microsoft Office 365 subscription. Many functions are intuitive, and Word can identify run-on sentences for you. It highlights them using a green line, prompting you to fix them. Some versions of Microsoft Editor provide suggestions for fixing sentences too.

Pros
  • It is included in Office 365.
  • The user interface is familiar and intuitive.
  • It highlights everything using a green line, making it easy to spot. 
Cons
  • Less suitable for those outside the Microsoft ecyosystem.
  • Not every edition provides a suggestion.
  • It might not catch everything.

9. Google Docs

Pricing: Free
Use for: Those who have multiple people working on the document simultaneously

Google docs have a basic free grammar checker

If you are looking for a program that allows you to collaborate with others on sentence edits, you may want to use Google Docs. Multiple people can work on the file in real-time, which is why it is popular among team members. It will catch some run-on sentences, but you may want to use another program, such as Grammarly, to augment Google Docs.

Pros
  • Offers free and easy-to-use fixes for sentences
  • Uses machine learning algorithms to catch errors that traditional sentence checkers miss.
  • Provides suggestions for alternative phrasing and vocabulary
  • Integrated directly into Google Docs editor
Cons
  • May not catch all errors, particularly for more complex language or nuanced writing styles.
  • Does not offer full-sentence revisions
  • Relies heavily on statistical patterns and may not recognize more creative or unconventional sentence phrasing.
  • Grammar checker can be overly aggressive flagging potential errors

10. Run on Sentence Checker

Pricing: Free
Use for: Quickly fixing sentences

Run on Sentence Checker
The tool is powered by Grammarly, so users are better off taking out a Grammarly subscription (or at least using the free version)

Run on Sentence Checker is a barebones free web app for fixing sentences. You can copy and paste short sentences into the app and check them for sentence structure issues. The tool is powered by Grammarly, so users are better off taking out a Grammarly subscription (or at least using the free version). That way, you can fix sentences and also access Grammarly’s other tools, including its grammar and plagiarism checker. 

Pros
  • Accessible via web browser
  • Works via copy and paste
Cons
  • Easier to use Grammarly
  • Limited

11. LanguageTool

Pricing: $5 per month
Use for: Editing sentences online

LanguageTool is user-friendly and detects over 1,700 patterns of errors.

LanguageTool is an open-source program that a group of language enthusiasts created to help people write more accurately. It is available online, but you can also download it to your device and use it offline. It checks many languages, not just the English language, and works with LibreOffice, Microsoft Word, Google Docs, Chrome and Firefox.

LanguageTool is very user-friendly and detects over 1,700 patterns of errors. It often finds mistakes other grammar checkers miss. This is a powerful spell-check tool to check for typos and commonly misused words as well. Because this is an open-source software program, it has a nice free version of its online grammar checker. It limits you to 20,000 characters. For $19 a month you can get more characters with the premium plan.

Pros
  • Works via a web-browers and offline
  • Supports multiple languages
Cons
  • Less powerful than competitors
  • No ability to apply full sentence rewrites

12. Antidote

Use for: Editing sentences without internet access

Antidote checks sentences locally on your machine

Antidote is a lesser-known sentence checker. Developed in France, it’s available on Mac Windows, Linux and Chromebook. It costs $59.95 per anum. Unlike, other sentence checkers here, Antidote works locally on your machine. It’s a good option if you dislike uploading writing to the cloud. It’s popular with businesses and academic institutions.

The company also sells Antidote+, which operates online like Grammarly. I particularly liked its ability to check sentences that I saved to my clipboard while writing in Apple Pages and Ulysses (pictured above). Read our Antidote review to learn more.

Pros
  • Works offline
  • Powerful sentence structure and grammar editing tools
Cons
  • Somewhat slower than Grammarly
  • No ability to apply full sentence rewrites

Why You Can Trust Me

There are a lot of great apps for improving sentence structure. The right program for one person is not necessarily the right program for everyone. For this round-up: 

  • I have personally used all of these products.
  • I have written various writing assignments, so I know what programs work well in different situations. 
  • I have also combined my knowledge with third-party reviews to ensure all essential points are highlighted. 

If you are looking for a program to help you correct run-on sentences, consider putting some programs to work. Looking for more? Learn how to check a sentence for grammar!

Author

  • Meet Rachael, the editor at Become a Writer Today. With years of experience in the field, she is passionate about language and dedicated to producing high-quality content that engages and informs readers. When she's not editing or writing, you can find her exploring the great outdoors, finding inspiration for her next project.

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