Riff is a free Chrome extension that helps you reply on X, LinkedIn and Facebook. You paste your rough point. Gemini Nano, the AI built into Chrome, writes a fresh reply for that exact post. You read it, edit it if you want, and press send yourself. Riff also answers your DMs in LinkedIn Messaging and Messenger on facebook.com, and drafts your own posts. Everything runs on your computer. There is no account, no API key, no server and no monthly bill. It needs desktop Chrome 138 or newer and a large one-time model download, with about 22 GB of free disk space. Riff never posts or sends anything for you.
Built by Michael Zima, CMO at Zima Media OÜ. He replies a lot on X and LinkedIn and wanted a reply tool with no account, no API key and no monthly bill, so he built Riff on the AI inside Chrome.