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
Review the store description, core capabilities, and common use cases.
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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5 stars until it stopped working, turning off spellcheck without being able to be turned on again.
great tool i love it
this is exactly what I was looking for. A free grammar correcter without AI that can be customized to you.
jak będzie polski język, to dam 5 gwiazdek
now with google docs support, it's just an objectively better grammarly, as it is signifigantly faster and free
Brilliant. Exactly what I was looking for
Usually, I don't rate products with 5 starts because I believe there is always room for improvements. However, while Harper still has to improve in some aspects, it is an outstanding initiative and great effort to bring such a feature for FREE. I can't thank you guys enough for doing it, so the minimum I can do is definitely rating it with 5 starts. Maintaining tool like this is, indeed, a piece of work, and I'm really glad these guys have been doing a great job on it. It has been a while since I started using Harper (replacing Grammarly entirely). I do use it as a browser extension and, also, as an LSP in Zed/VScode when working on my projects.
I love the hard work put into the details of this extension. Some features are missing, yes, but it's progress towards the decaying open-source support for grammar checking (looking at you, LT). Showing love so that support can expand to Google Docs! Edit: also, as an extension developer myself, I know how difficult it is to support features involving input boxes, so show some love in the reviews and keep in mind that the developer is going out of their way to respond to most feedback (rare these days)! This is why it deserves a 5 in my eyes.
Unimpressed by the actual correction. It detects mistakes quickly, yes, but the suggested correction is too often wrong and makes no sense. Then I have to manually fix the word anyway, basically doing its job. There's no way to give feedback that the suggestions were incorrect. Uninstalled from it giving me more work to do instead of less.
Great extension, so refreshing to have one that isn't trying to get you to subscribe every five minutes.