Proofly

Hey Product Hunt 👋 I’m Önder, the maker of Proofly.

For years I loved how tools like Grammarly and LanguageTool make writing easier, but I never felt fully comfortable sending every email, doc, and DM to someone else’s servers - especially for sensitive work, legal stuff, or private conversations. On top of that, most extensions inject heavy scripts and UI that slow pages down and clutter the host interface.

Proofly is my attempt at a different path: a privacy-first, open-source writing assistant that lives entirely in your browser and runs on Chrome’s built-in on-device AI (Gemini Nano). Your text never leaves your machine, it works offline after the initial model download, and there’s no account, no telemetry, no tracking as you can verify in the code.

Under the hood, Proofly uses native and modern Web Tech without relying on bloated frameworks and dependencies: Web Components, Shadow DOM, CSS Highlights, and a custom overlay system to paint precise underlines without mutating the page DOM. That keeps the footprint tiny, avoids layout bugs, and ensures the host site stays fully in control while Proofly just “floats” on top. It supports inputs, textareas, and contenteditable fields by respecting web semantics with the same lightweight UX, plus a side panel for power users who like to navigate through issues and triage them in bulk. The user experience of getting a proofreading assistance and fixing the issues are revamped with a fresh look at the problems. Watch the introduction video to see some of the amazing features and fresh ideas that Proofly introduces.

This launch is our first public alpha, focused on people who care about both writing quality and privacy: developers, founders, lawyers, journalists, therapists, and anyone who writes sensitive stuff in the browser. You’ll see "spelling", "grammar", "punctuation", "capitalization", "preposition", and “missing word” issues highlighted, with on-point inline suggestions instead of overly chatty AI.

I’d love your help with three things:
1. Tell me where privacy around writing matters most in your workflow (Emails, instant messages, helpdesk, CRM, docs, etc.).
2. Compare the suggestions to your current grammar checking tool - are they accurate and fast enough for real use?
3. Share what local AI writing assistance you’d want next (rewrites, tone shifts, templates, etc.) so we can shape the roadmap.

If you believe people shouldn’t have to trade privacy for good writing assistance, an upvote, comment, or share would mean a lot and help Proofly reach more writers. And if you’re into open source, you’re very welcome to star the repo, open issues, or jump into discussions on GitHub - links are in the launch sidebar.

Thanks for checking Proofly out 🙏

Awesome! This is something the world needs!

Congratulations on the launch! And can I set up automatic translation of what I write? Sometimes I need to translate into Spanish, which I don’t know. I have to copy from ChatGPT every time and paste it into the necessary browser windows. I’ve been thinking for a long time about an app that would free me from this useless activity.

My b2b company allows only white-listed extensions and Grammarly is not one of them. Big chances I can get this one through and write better emails.

How's it better then Gammarly?

Finally a writing assistant I can actually use. Congrats on the launch!

good stuff bro 👏