DeArrow - Better Titles and Thumbnails
Functionality & UI
FreemiumConfidence 64
Crowdsourcing titles and thumbnails to be descriptive and not sensational
Users
100K
Rating
4.3
Reviews
310
7D Growth
0|0%
Stable signalFree or hybridMedium-risk permissions
Private Grammar Checker - Harper
The private grammar checker for 21st Century English
Users40KCurrent public install base
Rating4.2Store average score
Reviews101Public review volume
Manifest versionV3Extension platform version
7-day growth0Net users gained this week
7-day growth rate0%Relative weekly velocity
Preview
3 assetsPrivate Grammar Checker - Harper Media preview
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User Growth Over Time
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7-day rating change
Start
4.14
Latest
4.17
7-day rating change
+0.03
2026年7月15日2026年7月21日
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1-day growthFlat
00%7-day growthFlat
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+10K+33.3%Technical snapshot
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Version1.12.0
ManifestV3
Size15.46MiB
Languages1English
Published
Store updated
Last crawled
English
Overview
Product summary
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Harper is an English grammar checker designed to be just right. I created it after years of dealing with the shortcomings of the competition.
Grammarly was too expensive and too overbearing. Its suggestions lacked context, and were often just plain wrong. Not to mention: it's a privacy nightmare. Everything you write with Grammarly is sent to their servers. Their privacy policy claims they don't sell the data, but that doesn't mean they don't use it to train large language models and god knows what else. Not only that, but the round-trip-time of the network request makes revising your work all the more tedious.
LanguageTool is great, if you have gigabytes of RAM to spare and are willing to download the ~16GB n-gram dataset. Besides the memory requirements, I found LanguageTool too slow: it would take several seconds to lint even a moderate-size document.
That's why I created Harper: it is the grammar checker that fits my needs. Not only does it take milliseconds to lint a document, take less than 1/50th of LanguageTool's memory footprint, but it is also completely private. That's the power of open source.
Reviews
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Store average score4.2Chrome Web Store aggregate rating, including ratings without synced review text
Synced text average3.9Average computed only from synced review bodies below
Reviews with text70Synced review bodies
Total ratings / reviews101Chrome Web Store public rating/review count
Store average score: 4.2. The bars below are calculated from synced review text only, so they may be empty for extensions that have public ratings but no synced comments yet.
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It's fine. The UI is a bit clunky it seems to flag up errors that aren't errors more often than LanguageTool. Doesn't work on every site, but the devs are quick to fix bugs.
Piece of garbage.... does a TERRIBLE job of finding grammar errors. Also, the tool gets in the way more than it helps... it does not easily allow editing an error, forcing you to choose one of its options even if none apply, Disappointed in the LanguageTool going the paid route. It works really well.
Could use some work, but overall my experience has been good.
Works great for English, but trashing LT for not being as fast while it's handling way more language than yourself is a bit cheap.
The extension is only available in English, with no other language options, making it pointless. Furthermore, it doesn't work in Google Docs, making it doubly pointless. It works well, checking text directly on the page, replacing the now-paid Language Tool.
What a great addon. It's not as featureful as the cloud versions, but it's opensource and it's FAST. Thank you!
it works great for what i have uses for. 8/10 would recommend. slight issue that brings it down to 4 stars is that in some websites i tested, it didn't work well, if at all.
Great! Small suggestion: Make it so that there's some delay or checks the written word after a space is inputted. Example: If I try to write the word tremendous, when I write "trem", it is already highlighting and saying its misspelled. Add some delay or wait until I type "trem " for it to determine if it's misspelled or not.
Overall, good. I'd expect more grammar rules to be implmented and also has dictionary spell check e.g. to check if word "implmented" is missing letters or misspelled.
I enjoy this more than Grammarly, but it doesn't tend to work on Google Docs. I can only recall seeing it in action briefly, but I have used the Harper website, and it does give great spellchecks and grammar fixes. That being said, if the developer does fix this and gets it to activate on Docs, then this is a five-star extension. Keep up the good work Elijah.