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 trend
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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
Growth overview
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1-day growthFlat
00%7-day growthFlat
00%30-day growthGrowing
+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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Just perfect. The sweet spot between incredible speed and relevant suggestions.
Não tem PT-BR
Thank you to all the developers for such an awesome, free extension. Works great!
I love that it is private! It's helps to review your text for mistakes and gives suggestions. It does not do as well as Grammarly; however, I prefer Harper because it values my privacy and does not use AI or sale my data. I recommend Harper to all my privacy conscious friends and family. I also like that it does not change my text for me.
Works greats over all, the only issue I would run into from time to time was using it the web interface of Discord.
put lines of code into all of my back-end website edit boxes that caused invisible errors (including input boxes that were hidden?!) why must it add a harper-render-box with a popover and style attribute everytime I open a page with an editable text box and then just leave them there?
good and easy
Does what is says on the tin.
I am going to keep it in my toolkit and disable Gra*** (you know the name) addon for a while - let's spellcheck my dirty texts domestically after about of month of using it - it is still a nice tool for writing features I'm missing: - disable for selected websites - a little bit more "human consumable" settings page (now it is 1km long, very flexible, but ..) - save settings somewhere (so i can use the same settings for more Harper integrations - like in other editors)
I love this grammar checker, it's not perfect but its free and private! Harper is a fantastic open source library for grammar checking in English if you need it, and the developer has plugin versions that extend beyond the chrome extension if you need it. The current bug I have is it doesn't automatically work on every site, and it cannot change text directly. Nor does it cover as much as a freemium or paid option. But at least it reminds you to review.