Riff

About Riff

Riff is a Chrome extension for people who spend time replying on social networks and messaging. It works on X, LinkedIn, Facebook and Instagram, drafting replies to posts, answering direct messages and writing original posts from a rough point you supply.

You give Riff your point, pick how smart, salesy or adventurous the reply should be, and it writes a draft fitted to that exact post or chat. It adjusts length and tone for each site and can repurpose a LinkedIn draft into an X thread or an Instagram caption. Riff inserts the text into the box you have open, but you read it and press send yourself.

The main difference is that Riff runs on Gemini Nano, the AI built into Chrome, so the site says no servers, API keys or monthly bill are needed. It lives in Chrome's side panel and can save brand voices and reusable presets.