Upsetter

An agent on your computer,
without the terminal.

Upsetter installs an open-source agent harness, gets it a model — local or cloud — and proves it answers before it tells you it is done. In plain language, with one action at a time.

Download Windows · macOS See what it does

How it works

  1. It looks at your machine first. Memory, disk, and whether a graphics card can help — then it picks the smallest model that will actually run well, and tells you why in one sentence.
  2. It installs a harness you choose. Hermes, OpenClaw, OpenCode or another open-source harness, from a version it pins. No terminal, no build tools.
  3. It gets you a model. A local model it downloads and verifies, or a cloud provider — with the sign-up walked through and the key stored in your system's credential store, never a file we wrote.
  4. It proves it works. One question, one answer, shown to you. An install that cannot answer is not finished, and it rolls back to nothing rather than leaving a half-installed machine.

Harnesses

Hermes

The harness this was built alongside. Gateway, tools, and a Discord or Telegram front door.

OpenClaw

The original: sessions, skills, and long-running work on your own machine.

OpenCode

A coding-first harness for people who want an agent in their editor and their repo.

Anything open

The installer speaks one adapter contract, so another open-source harness is one file — not a rewrite.

Download

Windows 10 / 11

Signed installer, x64. Build not published yet.

macOS 13+

Universal .dmg, notarized — double-click, no App Store. Build not published yet.

Questions

Does it need my password?

No. Sign-ins happen in your own browser with a code; Upsetter never shows a password field.

What does it send home?

Nothing about your files. The only thing that leaves is what you type into the agent.

Can I uninstall it cleanly?

Yes — every file it creates is recorded, and removing it removes exactly that list.