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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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
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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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Not a very intelligent spell checker. Laggy, bad corrections, missing words, if it even finds a word to suggest. Uses punctuation that really is not relevant. Tries too hard to insert itself to make itself seem more useful than it really needs to be. Overall, it could be a great extension if it smartened up in some ways, and dumbed itself down in other ways. All the people want is a simple, straight forward spell checker that does not make constant or unnecessary corrections and has smarter suggestions for misspelled words.
Great effort unfortunately fails a basic test. Examples:(Too many False flags) "extention" will suggest extent<space>ion unless the split-word rule is disabled. "Ok" is being suggested by the spellchecker as oak / of / oh.
It's not working on zendesk
Why is it not working for me on Brave, i can see there is no mention of brave but all the other extension with spell checking capabilities are working properly but this is not working even for a second, its like i have installed it but it is not turning on or what, i tried clicking the extension and tried turning On/Off but nothing worked. I would really love to use this private open source Grammar checker. Note- giving one star so that you can guide me to fix this issue or provide an update (I couldn't find a fix online that would have worked for me)
it was great
Amazing grammar tool, clean and effective, always like compact tools like this!
It is very nice if you use only one language (English). If you are a multilingual writer and English is your second language, things become more complicated. The extension doesn't detect that text is not in English and is aggressively trying to correct every word, which is a bit disturbing. Still deciding whether to keep it or uninstall.
I got rid of Grammarly after it added ai slop, and this is a basically perfect replacement! It gets stuff wrong now and then but no biggie. My one issue is that it reads lists as sentences, so it keeps highlighting my entire document and saying it's a hundred-word-long sentence or something. Otherwise, chef's kiss!
Works extremely well! Sometimes the highlight gets misplaced but it is probably the sites fault and not harpers and a reload often fixes it
it does not work on every website (especially google websites) but it is good overall!