# Agent Zero vs Unstoppable

> Agent Zero scores 54.3 (C) to Unstoppable's 34.9 (F) for agent harnesses. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/agent-zero-vs-unstoppable
- Markdown: https://www.anchorterminal.com/compare/agent-zero-vs-unstoppable.md (~3,650 tokens)
- Slim: https://www.anchorterminal.com/compare/agent-zero-vs-unstoppable.min.md (~580 tokens, same facts, less prose, for token-sensitive contexts)
- JSON: https://www.anchorterminal.com/compare/agent-zero-vs-unstoppable.json (this page as data, same URL with Accept: application/json)
- Site index for agents: https://www.anchorterminal.com/llms.txt (full text: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-10-28

Agent Zero scores 54.3 (C) on agent readiness against Unstoppable's 34.9 (F), and leads in 6 of 7 scored categories. Both do agent harnesses.

- Agent Zero: grade C, 54.3/100, rank #805 of 1218. Markdown https://www.anchorterminal.com/tools/agent-zero.md · JSON https://www.anchorterminal.com/api/v1/tools/agent-zero.json
- Unstoppable: grade F, 34.9/100, rank #1133 of 1218. Markdown https://www.anchorterminal.com/tools/unstoppable.md · JSON https://www.anchorterminal.com/api/v1/tools/unstoppable.json
- Best agent harnesses and coding agents: https://www.anchorterminal.com/best/agent-harnesses/index.md
- All 833 harnesses comparisons: https://www.anchorterminal.com/compare/agent-harnesses/index.md

## Which one, for what

### Agent Zero (C)

Good for: A technical owner who wants an agent with its own Linux machine, reachable from Telegram, WhatsApp or email, with scheduled tasks and editable memory.

Ahead on:
- Reliability, 57 against 45
- Schema & documentation, 64 against 30
- Agent ergonomics, 62 against 5
- Security & auth, 54 against 36
- Payments & pricing, 60 against 30
- Maintenance & community, 75 against 58

Also in its favour:
- Open source

Watch for: No approval step before shell commands, file changes or outgoing messages. Tool Access defaults to allow

### Unstoppable (F)

Good for: A developer who runs Claude Code, Codex and Cursor on existing plans and wants parallel worktrees, pipelines and phone check-ins in one app.

Also in its favour:
- Free to start without a card
- No incidents deducted, where Agent Zero loses 6 points for them

Watch for: No API, MCP server, SDK or documented CLI for an outside agent. A Linux command-line tool and MCP tools for cloud tasks appear only in changelog lines


## Score by category

| Category | Weight | Agent Zero | Unstoppable | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 57 | 45 | Agent Zero +12 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 64 | 30 | Agent Zero +34 |
| Agent ergonomics | 13% (16.2 this run) | 62 | 5 | Agent Zero +57 |
| Security & auth | 14% (17.5 this run) | 54 | 36 | Agent Zero +18 |
| Payments & pricing | 10% (12.5 this run) | 60 | 30 | Agent Zero +30 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 75 | 58 | Agent Zero +17 |
| Transparency & trust | 7% (8.8 this run) | 56 | 58 | Unstoppable +2 |
| Negative events | ≤15 | -6 | 0 | |
| **Total** | | **54.3 · C** | **34.9 · F** | |

## Facts side by side

| Fact | Agent Zero | Unstoppable |
| --- | --- | --- |
| Kind | Agent harness | Agent harness |
| Vendor | Agent Zero, s.r.o. | Unstoppable Domains, Inc. |
| Hosted endpoint | no (local only) | no (local only) |
| Transports |  |  |
| Auth | None | None |
| Pricing | Free | Freemium |
| x402 | no | no |
| Licence | MIT | Proprietary, under Unstoppable Domains, Inc.'s Terms of Service. No source published |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-09-23 | 2026-10-23 |
| Terms last updated | no document linked |  |
| Privacy policy last updated | no document linked |  |
| Customer content may train models |  |  |
| Terms restrict automated access |  |  |
| Terms restrict benchmarking |  |  |
| Terms or service can change without notice |  |  |
| Arbitration or class-action waiver |  |  |
| Popularity | 19k stars | none |

## Verdicts

**Agent Zero.** Self-hosted under the MIT licence, with nine releases in the 90 days to 12 October 2026 and breaking changes listed in the release notes. The agent runs shell commands in its container with no approval step, the web interface has no login by default, and five CVEs from the past year have no published GitHub advisory.

**Unstoppable.** Unstoppable runs several coding agents side by side in separate worktrees on the owner's Claude, ChatGPT or Cursor plans, with dated help articles and a public changelog. It has no API, MCP server or documented command an outside agent can call, every chat starts in Full access, and its pages disagree on which parts need a paid plan.

## Before you call either

### Agent Zero

1. Set a UI login and password in Settings before publishing the port or opening a tunnel. The default has none
2. Fill `allowed_users`, `allowed_numbers` or `sender_whitelist` before enabling a channel. An empty list accepts every sender
3. Enable the Infection Check plugin when the agent reads mail, web pages or MCP results. It ships disabled
4. Run v2.12 or later. It fixes a Telegram webhook authentication bypass and a WhatsApp media path traversal
5. Call `POST /api_message` with the `X-API-KEY` header. The token changes when the UI login or password changes

### Unstoppable

1. Don't plan to drive Unstoppable from another agent. It has no documented API, MCP server or CLI. Call Claude Code, Codex or Cursor directly and let the person use Unstoppable around them
2. Inside Unstoppable, check the approval mode before acting. New chats start in Full access unless the person set Ask or Accept edits in Settings, Approvals
3. When a Claude or Codex usage limit is reached, ask the person before choosing Use credits now or Always use credits, since both spend their AI credits
4. Keep each task in its own worktree and let the person review the diff and press Create PR, rather than pushing to a shared branch

## Questions

### Which is better for AI agents, Agent Zero or Unstoppable?

Agent Zero scores 54.3 (C) on agent readiness against Unstoppable's 34.9 (F), and leads in 6 of 7 scored categories.

### Are Agent Zero and Unstoppable open source?

Agent Zero is open source (MIT). No open-source release is listed for Unstoppable.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/agent-zero-vs-unstoppable.json, and with the fewest tokens: https://www.anchorterminal.com/compare/agent-zero-vs-unstoppable.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "agent-zero", "b": "unstoppable"}`. From a terminal: `anchor compare agent-zero unstoppable`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/agent-zero.json and https://www.anchorterminal.com/api/v1/tools/unstoppable.json

## Other comparisons with Agent Zero or Unstoppable

- [Agent Zero vs Aider](https://www.anchorterminal.com/compare/agent-zero-vs-aider.md)
- [Agent Zero vs Amp](https://www.anchorterminal.com/compare/agent-zero-vs-amp.md)
- [Agent Zero vs Antigravity CLI](https://www.anchorterminal.com/compare/agent-zero-vs-antigravity-cli.md)
- [Agent Zero vs Auggie CLI](https://www.anchorterminal.com/compare/agent-zero-vs-auggie.md)
- [Agent Zero vs Claude Code](https://www.anchorterminal.com/compare/agent-zero-vs-claude-code.md)
- [Agent Zero vs Cline](https://www.anchorterminal.com/compare/agent-zero-vs-cline.md)
- [Agent Zero vs Crush](https://www.anchorterminal.com/compare/agent-zero-vs-crush.md)
- [Agent Zero vs Cursor CLI](https://www.anchorterminal.com/compare/agent-zero-vs-cursor-cli.md)
- [Agent Zero vs DeepSeek Harness (dsh)](https://www.anchorterminal.com/compare/agent-zero-vs-deepseek-harness.md)
- [Agent Zero vs Devin](https://www.anchorterminal.com/compare/agent-zero-vs-devin.md)
- [Agent Zero vs Droid CLI](https://www.anchorterminal.com/compare/agent-zero-vs-droid-cli.md)
- [Agent Zero vs Pi](https://www.anchorterminal.com/compare/agent-zero-vs-earendil-pi.md)
- [Agent Zero vs Gemini CLI](https://www.anchorterminal.com/compare/agent-zero-vs-gemini-cli.md)
- [Agent Zero vs GitHub Copilot CLI](https://www.anchorterminal.com/compare/agent-zero-vs-github-copilot-cli.md)
- [Agent Zero vs goose](https://www.anchorterminal.com/compare/agent-zero-vs-goose.md)
- [Agent Zero vs Harness²](https://www.anchorterminal.com/compare/agent-zero-vs-harness2.md)
- [Agent Zero vs HarnessRouter](https://www.anchorterminal.com/compare/agent-zero-vs-harnessrouter.md)
- [Agent Zero vs Jules](https://www.anchorterminal.com/compare/agent-zero-vs-jules.md)
- [Agent Zero vs Junie CLI](https://www.anchorterminal.com/compare/agent-zero-vs-junie.md)
- [Agent Zero vs Kilo Code CLI](https://www.anchorterminal.com/compare/agent-zero-vs-kilo-code-cli.md)
- [Agent Zero vs Kimi Code CLI](https://www.anchorterminal.com/compare/agent-zero-vs-kimi-code-cli.md)
- [Agent Zero vs Kiro CLI](https://www.anchorterminal.com/compare/agent-zero-vs-kiro-cli.md)
- [Agent Zero vs mini-swe-agent](https://www.anchorterminal.com/compare/agent-zero-vs-mini-swe-agent.md)
- [Agent Zero vs MiniMax Code](https://www.anchorterminal.com/compare/agent-zero-vs-minimax-code.md)
- [Agent Zero vs Mistral Vibe CLI](https://www.anchorterminal.com/compare/agent-zero-vs-mistral-vibe-cli.md)
- [Agent Zero vs Muse Code](https://www.anchorterminal.com/compare/agent-zero-vs-muse-code.md)
- [Agent Zero vs OpenAI Codex](https://www.anchorterminal.com/compare/agent-zero-vs-openai-codex.md)
- [Agent Zero vs OpenCode](https://www.anchorterminal.com/compare/agent-zero-vs-opencode.md)
- [Agent Zero vs OpenHands](https://www.anchorterminal.com/compare/agent-zero-vs-openhands.md)
- [Agent Zero vs Prime Agent](https://www.anchorterminal.com/compare/agent-zero-vs-prime-agent.md)
- [Agent Zero vs Qoder CLI](https://www.anchorterminal.com/compare/agent-zero-vs-qoder-cli.md)
- [Agent Zero vs Qwen Code](https://www.anchorterminal.com/compare/agent-zero-vs-qwen-code.md)
- [Agent Zero vs Mirror CLI](https://www.anchorterminal.com/compare/agent-zero-vs-reflection-mirror.md)
- [Agent Zero vs Rovo Dev CLI](https://www.anchorterminal.com/compare/agent-zero-vs-rovo-dev-cli.md)
- [Agent Zero vs Vibe-Trading](https://www.anchorterminal.com/compare/agent-zero-vs-vibe-trading.md)
- [Agent Zero vs Warp (Warp Agent CLI and the Oz Agent API)](https://www.anchorterminal.com/compare/agent-zero-vs-warp.md)
- [Aider vs Unstoppable](https://www.anchorterminal.com/compare/aider-vs-unstoppable.md)
- [Amp vs Unstoppable](https://www.anchorterminal.com/compare/amp-vs-unstoppable.md)
- [Antigravity CLI vs Unstoppable](https://www.anchorterminal.com/compare/antigravity-cli-vs-unstoppable.md)
- [Auggie CLI vs Unstoppable](https://www.anchorterminal.com/compare/auggie-vs-unstoppable.md)
- [Claude Code vs Unstoppable](https://www.anchorterminal.com/compare/claude-code-vs-unstoppable.md)
- [Cline vs Unstoppable](https://www.anchorterminal.com/compare/cline-vs-unstoppable.md)
- [Crush vs Unstoppable](https://www.anchorterminal.com/compare/crush-vs-unstoppable.md)
- [Cursor CLI vs Unstoppable](https://www.anchorterminal.com/compare/cursor-cli-vs-unstoppable.md)
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- [Devin vs Unstoppable](https://www.anchorterminal.com/compare/devin-vs-unstoppable.md)
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- [goose vs Unstoppable](https://www.anchorterminal.com/compare/goose-vs-unstoppable.md)
- [Harness² vs Unstoppable](https://www.anchorterminal.com/compare/harness2-vs-unstoppable.md)
- [HarnessRouter vs Unstoppable](https://www.anchorterminal.com/compare/harnessrouter-vs-unstoppable.md)
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- [mini-swe-agent vs Unstoppable](https://www.anchorterminal.com/compare/mini-swe-agent-vs-unstoppable.md)
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- [Mistral Vibe CLI vs Unstoppable](https://www.anchorterminal.com/compare/mistral-vibe-cli-vs-unstoppable.md)
- [Muse Code vs Unstoppable](https://www.anchorterminal.com/compare/muse-code-vs-unstoppable.md)
- [OpenAI Codex vs Unstoppable](https://www.anchorterminal.com/compare/openai-codex-vs-unstoppable.md)
- [OpenCode vs Unstoppable](https://www.anchorterminal.com/compare/opencode-vs-unstoppable.md)
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- [Unstoppable vs Vibe-Trading](https://www.anchorterminal.com/compare/unstoppable-vs-vibe-trading.md)
- [Unstoppable vs Warp (Warp Agent CLI and the Oz Agent API)](https://www.anchorterminal.com/compare/unstoppable-vs-warp.md)

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Query this catalogue directly over MCP: https://www.anchorterminal.com/mcp (Streamable HTTP, no key). How: https://www.anchorterminal.com/agents/#mcp