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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Does not work on google docs or outlook. I can't seem to get it to work on Word either, this is really disappointing. I've been trying to find a replacement for languagetool since they now require subscription, and grammerly is awful. Should this be resolved and the extension actually works on docs and outlook, and perhaps create an IOS app version to install on mac for Word I'd reconsider it.
Extremely promising, I love the privacy focus, but it does not support enough websites yet. My main use case is Slack in the web browser, and it does not seem to work there, so it is not yet a viable choice for me compared to competitors. I have found a Github discussion mentioning Slack, but it seems dead. Edit: It is now working well in Slack, so I was able to remove the lesser competitor QuillBot. Great tool, thank you!
just needs german support then its perfect
The only grammar extension you need. You should probably also disable the system and browser spell check and use this for that as well as grammar usage. The open-source community is great.
Thank you very much for making this! It works great and works smoothly! This is a must install after every new chrome install.
In doesnt work for the only 2 reasons i've installed this: youtube and reddit coments. In youtube doesnt even detect words, and in reddit it underline errors but the correction pop up doesnt show up when you click on it.
Works like a charm, better than the overly expensive alternatives.
It's helping me catch mistakes I wouldn't have noticed right away. When I looked at some of the flags and thought they were wrong i just looked for a different word or read the sentence out and realized where I went wrong. For my needs it's great. It does have some bugs, but I'm expecting they will eventually get worked out. Like some of the capitalization flags.
I really wanted to like this and escape Grammarly but unfortunately it doesn't seem up to the task, missing many grammar errors that Grammarly picks up and most annoyingly, given that I do most of my writing within the Wordpress editor, marking any sentence which contains a link as an uncapitalised sentence error proceeding and following the link. I might check it out again in the future but as is, Harper feels not at all production ready for what is a very common writing case.
I've been using Harper instead of Grammarly for a few months already, and I can't be happier! I can't wait to see the great improvement when this tool reaches version 1.0.0! Great job! I hope that, eventually, it will also support languages other than English.