Press kit.

fidelius keeps your API keys in the iCloud Keychain, grouped by project, and lets AI coding agents use them without a .env file.

fidelius is a Mac app for developers who build with AI agents. It keeps API keys and key files grouped by project in the iCloud Keychain, so they sync to every Mac on the same Apple Account, end-to-end encrypted, with no account and no fidelius server. A command called accio runs anything with a project's keys as environment variables (accio myapp npm run dev), so there is no .env file in the repo for an agent to read or for git to pick up. fidelius writes the instructions into Claude Code, Codex and Gemini CLI, and when an agent runs accio, key values in the output are replaced with a placeholder. Free for one project; Pro is $24 once for as many projects as you need.

Maria Otworowska is an indie developer at Bliss Labs. She makes Mac and iOS apps, including Skin Bliss, N‑day and fidelius, and builds them with Claude Code.