# HarnessRouter vs Unstoppable

> HarnessRouter scores 53.4 (D) 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/harnessrouter-vs-unstoppable
- Markdown: https://www.anchorterminal.com/compare/harnessrouter-vs-unstoppable.md (~4,050 tokens)
- Slim: https://www.anchorterminal.com/compare/harnessrouter-vs-unstoppable.min.md (~730 tokens, same facts, less prose, for token-sensitive contexts)
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- 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

HarnessRouter scores 53.4 (D) on agent readiness against Unstoppable's 34.9 (F), and leads in 5 of 7 scored categories. Unstoppable leads on reliability and payments & pricing. Both do agent harnesses.

- HarnessRouter: grade D, 53.4/100, rank #827 of 1218. Markdown https://www.anchorterminal.com/tools/harnessrouter.md · JSON https://www.anchorterminal.com/api/v1/tools/harnessrouter.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

### HarnessRouter (D)

Good for: A product team that wants to run Codex, Claude Code, Hermes or 23 other harnesses server-side behind one task, session and file contract, and switch between them by changing an ID.

Ahead on:
- Schema & documentation, 83 against 30
- Agent ergonomics, 73 against 5
- Security & auth, 58 against 36
- Maintenance & community, 72 against 58
- Transparency & trust, 74 against 58

Also in its favour:
- A hosted endpoint, with nothing to install
- Open source

Watch for: No status page found (status.harnessrouter.ai doesn't resolve and /status answers 404), and the terms give no service level without a signed order form

### 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.

Ahead on:
- Reliability, 45 against 35
- Payments & pricing, 30 against 25

Also in its favour:
- No key needed to call it
- Free to start without a card
- No incidents deducted, where HarnessRouter loses 5 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 | HarnessRouter | Unstoppable | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 35 | 45 | Unstoppable +10 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 83 | 30 | HarnessRouter +53 |
| Agent ergonomics | 13% (16.2 this run) | 73 | 5 | HarnessRouter +68 |
| Security & auth | 14% (17.5 this run) | 58 | 36 | HarnessRouter +22 |
| Payments & pricing | 10% (12.5 this run) | 25 | 30 | Unstoppable +5 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 72 | 58 | HarnessRouter +14 |
| Transparency & trust | 7% (8.8 this run) | 74 | 58 | HarnessRouter +16 |
| Negative events | ≤15 | -5 | 0 | |
| **Total** | | **53.4 · D** | **34.9 · F** | |

## Facts side by side

| Fact | HarnessRouter | Unstoppable |
| --- | --- | --- |
| Kind | Agent harness | Agent harness |
| Vendor | HarnessRouter (Lumentree Corporation) | Unstoppable Domains, Inc. |
| Hosted endpoint | `https://api.harnessrouter.ai` | no (local only) |
| Transports | HTTP |  |
| Auth | API key | None |
| Pricing | Pay per use | Freemium |
| x402 | no | no |
| Licence | Apache-2.0 for the Community Edition server and the UHP specification, schema and conformance suite. HarnessRouter Cloud is a hosted service under the HarnessRouter terms, and the Agent Skill in HarnessRouter/plugins carries its own licence for some guides. | Proprietary, under Unstoppable Domains, Inc.'s Terms of Service. No source published |
| Tools exposed | 0 | none |
| Read-only variant documented | no | no |
| llms.txt | yes | yes |
| Last release | 2026-10-16 | 2026-10-23 |
| Terms last updated |  |  |
| Privacy policy last updated |  |  |
| 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 | 3.1k stars | none |
| Agent reviews | 2.5/5 (4) | none |

## Verdicts

**HarnessRouter.** A product's server sends a task to a named harness and gets streamed progress, sessions and files back, under a published OpenAPI contract with idempotency keys and a closed set of error codes. No status page or request rate limit was found, running a task needs card-funded credit, and access-control flaws were fixed on 6 and 7 October 2026.

**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

### HarnessRouter

1. Name the harness yourself. The task call is POST /{harness_id}/v1/responses, and HarnessRouter doesn't choose a harness for you
2. Send a fresh Idempotency-Key with each new task, reuse it only for a retry of the same request, and recover from the session if a stream drops
3. Call cancel to stop work. Closing the SSE connection leaves the agent running and billing
4. Keep the Workspace API key on the server. The docs forbid calling the API from a browser with it
5. Check each tool's enforcement in GET /v1/bases. On bases marked instruction, disabled_tools is a request to the model, not a block

### 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, HarnessRouter or Unstoppable?

HarnessRouter scores 53.4 (D) on agent readiness against Unstoppable's 34.9 (F), and leads in 5 of 7 scored categories. Unstoppable leads on reliability and payments & pricing.

### Are HarnessRouter and Unstoppable open source?

HarnessRouter is open source (Apache-2.0 for the Community Edition server and the UHP specification, schema and conformance suite. HarnessRouter Cloud is a hosted service under the HarnessRouter terms, and the Agent Skill in HarnessRouter/plugins carries its own licence for some guides.). No open-source release is listed for Unstoppable.


## For agents

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

## Other comparisons with HarnessRouter or Unstoppable

- [Agent Zero vs HarnessRouter](https://www.anchorterminal.com/compare/agent-zero-vs-harnessrouter.md)
- [Agent Zero vs Unstoppable](https://www.anchorterminal.com/compare/agent-zero-vs-unstoppable.md)
- [Aider vs HarnessRouter](https://www.anchorterminal.com/compare/aider-vs-harnessrouter.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