Riff（リフ）
Free planAIJapanese UIEnglish UI
Overview
Riff is a free extension for Chrome, Brave and Edge. Chat in its dedicated tab, Riff Home, and write replies and posts in a side panel on X, LinkedIn, Threads, Facebook, Instagram, YouTube, and on the web versions of Slack and Teams. All models run on your computer, and Riff never posts for you. No server, no API key, no monthly fee. Gemini Nano writes in 5 languages, Gemma 4 in 16.
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A note from the maker
I built Riff as a free AI reply assistant that runs entirely on your own computer. It needs no server, no API key and no monthly fee, and Riff never posts on your behalf.
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Facts from official sources
Key features
- Chat with AI in a dedicated tab, Riff Home
- Write replies and posts in a side panel on X, LinkedIn, Threads, Facebook, Instagram and YouTube
- Also works on the web versions of Slack and Teams
- All models run on your computer (no server, API key or account)
- Learns your writing voice
- Gemini Nano writes in 5 languages, Gemma 4 in 16
Platforms
Chrome extension / Brave / Edge / Safari
Pricing
| Pricing type | Free |
|---|---|
| Free plan | Yes |
| Price | Free (no account, subscription or monthly fee) (checked 2026-11-14) |
Developer
| Web version | No |
|---|---|
| Languages | Japanese / English (Declared by the developer) |
| Uses AI | Yes |
| AI technology | Gemini Nano (built into Chrome), Gemma 4 (runs on device) |
| Indie / small team | Unverified |
| Released | Unverified |