Private Grammar Checker - Harper
Extension Actions
CRX ID
lodbfhdipoipcjmlebjbgmmgekckhpfb
Status
- ★Featured
- Live on Store
Description from extension meta
The private grammar checker for 21st Century English
Image from store
Description from store
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.
Latest reviews
- Marie Becker
- This is a a good spell checker, although, sometimes when you accept another spelling, it creates a weird word the includes the letters already present - so care has to be taken to watch for that. The grammar check seems okay, again, sometimes the change is a jumbled mix of letters. My fix is often to dismiss the issue and then correct it myself. One downside, it doesn't always seem to remember new words when added to the dictionary - almost like you must add the words for each page or app being used. I enjoy that it is private and doesn't keep my words or work - like AI spelling and grammar checks do.
- Hector Lopez
- I enjoy this addon but I dont know where to Leave a bug fix so I will do it here, I sometimes have to write in an RTF field and this addon seems to be uniquely adding this empty string at the end <p> </p>. This is adding extra padding to text im writing. I hope the devs read this and fix this bug, it was happening on the optimizely CMS if it helps you.
- Spaceturd 64
- It's great for spellchecking.
- Tanakrit
- "Control + E" as the default shortcut for applying the last suggestion is dumb. It overlaps with the very common "go to the end of a line" shortcut.
- Untemi
- I wish we had more tools like this
- CyanoTex
- Good tool. While I wish it had some of Quillbot's functions, it's perfectly usable. Just don't use it when you got a lot of text! Slows your page down. :-P
- Lucas Nunes Garcia
- Open source tool for many different environments (Neovim, Obsidian, Chrome, etc) works great with everything
- Barbara Christensen
- Love this thing! Less annoying in the UI than the -ly app and doesn't use AI or store my data? Perfect.
- Jim Habib
- I love this grammar checker. it does what it was made for, and for free. kudos to the developers.
- Veer Mehta
- Great just some minor tweaks need to be made and only for my mac google docs it doesn't.
- Sivasakari Raja
- this was the only checker which aint selling off my text to AI training. and is very good but has major issues= its spelling is still bad for very basic words. and many other issues hope u fix it
- Peter Wang
- Amazing, does the job, no complaints.
- Robert Willis
- One of the only Grammar checkers that hasn't joined big tech in the AI frenzy, one of the last ethical ones.
- Ross Rose
- This app works great for google and other popular search engines. But I use Ecosia, and it doesn't work at all on that search engine. Can this be fixed?
- Tone Price
- Breath of fresh air compared to the other bloated options. It may not be perfect, but it beats the alternatives. Hopefully the developers continue improving on it!
- Elisabeth (witchygraph)
- I'd rather use something that's free to use and doesn't rely on AI than having to use extensions like Grammarly or SpellChecker. Of course there is still a lot of room for improvement, but that's what I'm cheering for. I'll keep reporting issues with incorrect reviews to give feedback and help the dev team develop Harper.
- David Becker
- It's ok, but it often suggests a single correction that is no where near the correct grammar. I understand it's still in development and will try it out again in the future, but for now it's less useful than Googles built in spell checker.
- Saiful Islam
- free, open-source, still developing. much love to the dev team <3
- Louis Hilden
- I'm so happy I don't have the Grammery keylogger installed anymore, it makes me want to cry.
- Eric Ketzer
- Unfortunately, too many false negatives recently. Ironically, it often wrongly says to write "too" for "to" or "then" for "than". It would need itself a spell checker. It needs a lot of improvement.
- Ari hollars
- As a dyslexic person who hates AI, this is a total lifesaver! I haven't encountered any bugs at the moment, and it doesn't lag my laptop at all.
- HxI리처드
- Works for me. I don't mind going an extra mile if there are any issues.
- Peter Laws
- Zendesk functionality is unreliable, works about 40% of the time, requiring a page refresh to restore functionality, sometimes just cutting out mid writing. The UI is really nice but the spell checker is quite limited, it really struggles to handle words where a letter should be repeated and has been missed.
- Steve B
- 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.
- hemanth kumar
- 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.
- Edin Abdulahi
- It's not working on zendesk
- Parth Pathak
- 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)
- Christiana osuji
- it was great
- Yingjie Liu
- Amazing grammar tool, clean and effective, always like compact tools like this!
- Michael Newbeing
- 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.
- Michael Coles
- 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!
- Emrik Östling
- Works extremely well! Sometimes the highlight gets misplaced but it is probably the sites fault and not harpers and a reload often fixes it
- Aymen Chraf
- it does not work on every website (especially google websites) but it is good overall!
- Justin Quinn
- 5 stars until it stopped working, turning off spellcheck without being able to be turned on again.
- Kai Al
- great tool i love it
- Madison Dillard
- this is exactly what I was looking for. A free grammar correcter without AI that can be customized to you.
- rahul ganesh
- now with google docs support, it's just an objectively better grammarly, as it is signifigantly faster and free
- Jonno Andrews
- Brilliant. Exactly what I was looking for
- Rogerio Taques
- 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.
- Alexander Dalat
- 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.
- Jazz-axy
- 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.
- Paul Matthews
- Great extension, so refreshing to have one that isn't trying to get you to subscribe every five minutes.
- Ceb Bec
- Just perfect. The sweet spot between incredible speed and relevant suggestions.
- David Swanson
- Thank you to all the developers for such an awesome, free extension. Works great!
- Becky Foshee
- 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.
- Tom Lawrence
- Works greats over all, the only issue I would run into from time to time was using it the web interface of Discord.
- John Voegtlin
- put lines of code into all of my back-end website edit boxes that caused invisible errors 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?
- David
- good and easy
- Edward van Tonder
- Does what is says on the tin.
- m k
- 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)