Not a mail client. Not another app to check. A quiet agent that reads every thread each morning, keeps only what genuinely still needs you, and sets the rest aside. Reversibly.
macOS 26source-availableyour own Google + Claude
You don't have an email problem. You have a "did I miss something" problem.
The inbox is not full of important things. It's full of things you haven't decided about yet. That uncertainty is what keeps pulling you back, refreshing, scanning. You're not behind on email. You're behind on having a system you can actually trust.
Zero is that trust. It reads everything. It keeps only open loops. And because nothing is ever deleted, you can let go.
Letting an agent touch your inbox is a trust question, not a features question. Here is how we've answered it.
Archive means: remove the INBOX label, add a dated recovery label. One Gmail search undoes any run. Your mail never leaves All Mail.
Your Google credentials and your Claude key. Zero has no server and no access to your mail outside your Mac.
Runs once a morning and disappears. Nothing new to check.
Your keep-rule is one file, written in sentences. You can read the agent's reasoning for every thread. No black box, no brittle regex.
Source-available. Read exactly what runs on your inbox. No compiled binaries, no hidden logic. The keep-bar logic is a plain-language prompt you can inspect and edit.
Add as many Gmail accounts as you use. They're all read and judged together, against the same keep-bar. One run, one quiet result across all of them.
Claude powers the judgment layer today. Codex, Hermes, and other agent CLIs are supported through a provider abstraction. Zero uses whichever one you have.
You supply the API key. It stays on your machine. The abstraction is intentional: the judgment logic is provider-agnostic.
Let your inbox keep itself.
macOS 26source-availableyour own Google + Claude