Korr
Free offline grammar checker for 5 languages, no account
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Korr fixes French, English, Spanish, Italian and Portuguese right where you write: no account, no limit, no connection needed. Everything runs on your device. There is no analysis server, and you can check it: cut your connection after the first load and it keeps working. Every change is listed and can be rejected one by one. When a fix is uncertain, Korr changes nothing. Website and Chrome extension (Alt+Shift+C) for all five languages; Windows app (Ctrl+Alt+C) for French and English.
PH · launched Sep 15, 2026 · 1 upvote (top 69%) · 0 views
Niche: ai writing assistants · 186 launches, 8 in the last 7 days ▼ -64% · Explore this niche →
Category and tags
- Horizontal
- Content generation
- B2C
- Not AI
- Commercial product
- Chrome Extensions
- Writing
- Security
Visit website ↗ Source listing ↗
More like this: all 186 launches in ai writing assistants →
Could you build this?
Partial A basic UI wrapper is simple, but compiling and running an accurate offline, multi-language grammar checker in-browser/on-device requires specialized WASM compilation and model quantization.
What it would actually take: The architecture requires compiling an established NLP engine (such as LanguageTool or quantized small transformer models) to WebAssembly via Rust or C++, running inside a Web Worker. The critical difficulty is maintaining low memory usage (<150MB) and fast keystroke latency across five languages while packaging large rule/dictionary databases directly into client-side bundles. This requires expertise in WebAssembly performance tuning, client-side memory management, and computational linguistics.
Competitors
Other products that read as similar to this one : 113 launches clear the similarity bar, closest 8 shown.
Attention rank: #101 of 114 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 272 days after the earliest competitor.
- Korr for Chrome · ph · 2026-10-16 · 1 upvotes · similarity 0.58
- ABC Base Connect · ph · 2026-10-07 · 1 upvotes · similarity 0.41
- xliff.ai · ph · 2026-10-23 · 1 upvotes · similarity 0.40
- claude-grammar · github · 2026-10-29 · 26 upvotes · similarity 0.40
- OnlyTranslate · ph · 2026-10-05 · 1 upvotes · similarity 0.39
- AudioScript 声稿 · ph · 2026-11-03 · 2 upvotes · similarity 0.39
- Open Lingo · ph · 2026-10-12 · 2 upvotes · similarity 0.39
- Verbeo · ph · 2026-11-04 · 2 upvotes · similarity 0.38
The niche, labels, vibe code rating and competitor comparison on this page are analysis by Nicheloom. If you use them, please credit nicheloom.com. How you may use our data.