Freebuff is a free AI coding agent from the team behind Codebuff, built to remove the subscription barrier from agentic software development. The open-source client is published on GitHub under the Apache-2.0 license, where it has collected more than 13,600 stars, and the project was actively developed through 2026. Its pitch is simple: frontier coding models, available to everyone, funded by advertising instead of a monthly bill.
Freebuff works the way modern coding agents do: you describe a task, and the agent explores your codebase, edits files, runs commands and iterates until the job is done. It runs in the terminal, as a desktop app for macOS, Windows and Linux, on the web, and through a mobile app, with threads stored in the cloud so a session started at your desk can be reviewed from your phone. One-click integrations connect it to tools such as GitHub, Linear and Stripe so the agent can act across your existing stack while it works.
Freebuff is completely free to use โ $0 forever, with no card and no credit system to watch. The service is funded by advertising; the separate paid Codebuff product targets users who want an ad-free, higher-limit experience.
Freebuff is aimed at students, hobbyists, indie hackers and professional developers who want a capable coding agent without paying for another subscription, and who are comfortable with an ad-supported model in exchange for free frontier-model access.