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
Version, languages, and crawl freshness
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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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Local. Privacy focused.
Best free grammar checker that I've ever used! Also big plus that it all stays local.
I finally got a big enough ick using Language Tool given the widely-understood security and privacy concerns that I picked my head up to find something else. I am absolutely over the moon with what Harper provides. Slots in like a charm and works in the exact way I used LT, minus the shady key-logging and targeting potential. Thank you so much for building this!!
Doesn't work with any MSFT product, Excel, Outlook, etc.. Basically anywhere you would actually need to use it.
Harper related files in TypeScript are requested regardless if I disable it on a specific website. Missing many rules, e.g. misuse of verb tenses e.g. use of relating or related does not make a difference in a sentence, misuse or overusing of pronouns, it's good to detect some typos though. Also it misses an editor for cases on which the extension doesn't work in an input field.
Does not work in Google Documents, but LanguageTool does it
I've been using Harper in Neovim for a long time and am glad to see it as an extension!
Awesome extension! It's privacy focused, that means that every check it done locally on your computer, there is no server where your data goes! And because of that it's blazingly fast compared to Grammarly.
Harper is the privacy-focused grammar checker the world needs! I've been incredibly frustrated with overbearing suggestions from alternatives like Grammarly and concerned about their privacy policy. I've been using Harper on my notes in Obsidian for months, and it's been a game-changer! I'm so happy that it's available for the browser!
It works great!