Riff

Riff is a free Chrome extension that helps you reply on X, LinkedIn, Facebook and Instagram. You paste your rough point and Gemini Nano, the AI built into Chrome, writes a fresh reply for that post. You read it, edit it if you want, and send it yourself. Riff also answers DMs in LinkedIn Messaging, Messenger on facebook.com and Instagram Direct, and can draft your own posts. Everything runs on your computer: no account, no API key and no servers. Riff never posts or sends anything for you. Requires desktop Chrome 138 or newer.