Alpha Harness sits between your AI coding agent and your repo. It stops destructive commands before they run, brings your rules and notes into each session, and keeps your code on your machine. For Claude Code, Codex, Gemini CLI, Cursor and more.
Works with the tools you already pay for
Pricing
Every guardrail is free, in every plan. Paying adds the laws, the machines and the team around them. The first 100 Pro customers and the first 100 teams keep their price for as long as they stay.
Try it on your own projects
Includes
Everything that protects your work is free and always will be.
For developers who ship every day
Everything in Free, plus
After the first 100: $39/month. Yours stays $29 for as long as you keep paying.
For small teams that build together
Everything in Pro, for 3 people, plus
After the first 100 teams: $99/month. Yours stays $79 for as long as you keep paying. Grows 3 people at a time. Many more? Talk to us.
For companies of any size
Everything in Teams, plus
Tell us how many people and which AI tools they use, or email support@alphaharness.ai.
| Feature | Free | Pro | Teams | Enterprise |
|---|---|---|---|---|
| Protection | ||||
| Every guardrail, in the 9 tools that can block | ✓ | ✓ | ✓ | ✓ |
| The protection laws, in every tool | ✓ | ✓ | ✓ | ✓ |
| Laws | ||||
| Premium laws from our cloud | — | ✓ | ✓ | ✓ |
| The team law (one shared rulebook) | — | — | ✓ | ✓ |
| Your company’s rules and blocked commands | — | — | ✓ | ✓ |
| Laws written with you for your industry | — | — | — | ✓ |
| Memory and machines | ||||
| Memory across every session | ✓ | ✓ | ✓ | ✓ |
| Workspaces | 1 | Unlimited | Unlimited | Unlimited |
| Machines | 1 | 2 | 2 per person | 3 per person, more on request |
| People | 1 | 1 | 3 | Any number |
| Team | ||||
| Admins and invitations | — | — | ✓ | ✓ |
| Workspace record with export | — | — | ✓ | ✓ |
| Live hive mind across machines | — | — | ||
| Billing and support | ||||
| Monthly or yearly (two months free) | — | ✓ | ✓ | As agreed |
| Founding price, kept while you pay | — | First 100 | First 100 teams | — |
| 14-day money-back guarantee | — | ✓ | ✓ | ✓ |
| Card or PayPal | — | ✓ | ✓ | Invoice on your terms |
| Support | Founders, directly | Founders, directly | A named person | |
14-day money-back guarantee on paid plans · cancel any time · refer someone, earn 30%
Why Alpha Harness
Each one runs on your machine, each one is tested, and each one tells you exactly what it did.
Guards
Everything your agent tries to do is checked on your machine first. The destructive ones are refused, with a reason the agent understands, so it takes the safe path instead.
git push origin main --force | Blocked | rewrites shared history |
rm -rf ./build | Blocked | deletes with no way back |
echo "API_KEY=x" > .env | Blocked | overwrites your secrets |
npx drizzle-kit push | Blocked | changes a live database |
git status | Allowed | |
npm test | Allowed | |
git diff --stat | Allowed |
Memory
What you settled last month comes back at the moment it matters, and only then. When nothing is relevant, nothing is added: no padding, no bill for noise.
Laws
8 protection laws on every plan, 18 with Teams, and room for your own. Each tool gets them where it actually reads them, and every copy stays identical.
| Claude Code | Rules + full guards |
| Gemini CLI | Rules + full guards |
| Codex | Rules + full guards |
| Cursor | Rules + live guards |
| Antigravity | Rules + live guards |
| Hermes Agent | Rules + full guards |
| Kimi Code | Rules + full guards |
| GitHub Copilot CLI | Rules + live guards |
| OpenCode | Rules + live guards |
| Aider | Rules |
| Droid | Rules |
| Amp | Rules |
| Pi | Rules |
Doctor
Protection that quietly stopped working is worse than none. The Doctor tests every layer end to end on a schedule, repairs what is safe to repair, and shows you what it did.
Measured, not promised
Every check runs on your machine, in milliseconds. No server in the loop, so nothing waits on a network.
Measured 2026-10-17 on the current build, on an Apple M2 Max. What changed since: the changelog.
Trust
Guards, memory and the Doctor run locally and keep working offline. Your code and your notes are never uploaded.
Rules are plain files on your disk. What we add is clearly marked, and your own text is never rewritten.
Every block is logged with its rule. The Privacy screen prints the exact bytes of anything sent, and every part of it can be switched off.
Uninstall removes every file and hook it added, in every tool, and says what it did.
Questions
Does it slow my terminal down?
No. Each check is measured at 26 ms at the 95th percentile on an Apple M2 Max. You will not notice it.
Does my code leave my machine?
Never. Rules, notes and guards are files on your disk and work offline. Every plan sends anonymous usage data with no file names, prompts or commands in it, and you can switch any part of it off. Every switch is on the app's Privacy screen, next to the exact bytes.
Which AI coding tools does it support?
Claude Code, Gemini CLI, Codex, Cursor, Antigravity, Hermes Agent, Kimi Code, GitHub Copilot CLI, OpenCode, Aider, Droid, Amp, Pi. The download page lists exactly what each one gets, and what it cannot do.
How do I undo it?
In the app: Settings → Uninstall. One click, and every file goes back the way it was. Your notes are never deleted.