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 exact post. You read it, edit it, and press send yourself. It also answers DMs in LinkedIn Messaging, Messenger on facebook.com and Instagram Direct, and drafts your own posts. Everything runs on your computer: no account, no API key, no servers. Riff never posts or sends anything for you.