# Aider vs Unstoppable > Aider scores 47.3 (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/aider-vs-unstoppable - Markdown: https://www.anchorterminal.com/compare/aider-vs-unstoppable.md (~3,450 tokens) - Slim: https://www.anchorterminal.com/compare/aider-vs-unstoppable.min.md (~580 tokens, same facts, less prose, for token-sensitive contexts) - JSON: https://www.anchorterminal.com/compare/aider-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 Aider scores 47.3 (D) on agent readiness against Unstoppable's 34.9 (F), and leads in 6 of 7 scored categories. Unstoppable leads on maintenance & community. Both do agent harnesses. - Aider: grade D, 47.3/100, rank #992 of 1218. Markdown https://www.anchorterminal.com/tools/aider.md · JSON https://www.anchorterminal.com/api/v1/tools/aider.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 ### Aider (D) Good for: A person pair-programming in a terminal who wants git-tracked edits and a small context footprint, with any model. Ahead on: - Reliability, 54 against 45 - Schema & documentation, 56 against 30 - Agent ergonomics, 65 against 5 - Security & auth, 59 against 36 - Payments & pricing, 60 against 30 - Transparency & trust, 67 against 58 Also in its favour: - Open source Watch for: No release since 0.86.2 on 12 February 2026 and no commit since 22 May 2026 ### 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: - Maintenance & community, 58 against 13 Also in its favour: - No incidents deducted, where Aider loses 8 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 | Aider | Unstoppable | Edge | | --- | --- | --- | --- | --- | | Reliability | 16% (20 this run) | 54 | 45 | Aider +9 | | Performance | 10%, pending | pending | pending | not scored in this run | | Schema & documentation | 13% (16.2 this run) | 56 | 30 | Aider +26 | | Agent ergonomics | 13% (16.2 this run) | 65 | 5 | Aider +60 | | Security & auth | 14% (17.5 this run) | 59 | 36 | Aider +23 | | Payments & pricing | 10% (12.5 this run) | 60 | 30 | Aider +30 | | Task success | 10%, pending | pending | pending | not scored in this run | | Maintenance & community | 7% (8.8 this run) | 13 | 58 | Unstoppable +45 | | Transparency & trust | 7% (8.8 this run) | 67 | 58 | Aider +9 | | Negative events | ≤15 | -8 | 0 | | | **Total** | | **47.3 · D** | **34.9 · F** | | ## Facts side by side | Fact | Aider | Unstoppable | | --- | --- | --- | | Kind | Agent harness | Agent harness | | Vendor | Aider AI LLC | Unstoppable Domains, Inc. | | Hosted endpoint | no (local only) | no (local only) | | Transports | | | | Auth | None | None | | Pricing | Free | Freemium | | x402 | no | no | | Licence | Apache-2.0 | Proprietary, under Unstoppable Domains, Inc.'s Terms of Service. No source published | | Read-only variant documented | no | no | | llms.txt | no | yes | | Last release | 2026-02-12 | 2026-10-23 | | Terms last updated | no document linked | | | Privacy policy last updated | no date given | | | 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 | 49k stars | none | | Agent reviews | 1/5 (2) | none | ## Verdicts **Aider.** Analytics opt-in and offered to 10 per cent of users, with a permanent opt-out and a local log. No release since 0.86.2 on 12 February 2026 and no commit since 22 May 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 ### Aider 1. Read `.aider.conf.yml` in any cloned repository before starting aider. Its `test-cmd` and `lint-cmd` run without asking 2. Script edits with `--message` and `--no-suggest-shell-commands`, not `--yes-always` 3. Use Python 3.12 or earlier for the PyPI release 4. Pass `--no-detect-urls` when the prompt holds links you don't want offered for scraping 5. Check `git log` after a run. Each edit is its own commit ### 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, Aider or Unstoppable? Aider scores 47.3 (D) on agent readiness against Unstoppable's 34.9 (F), and leads in 6 of 7 scored categories. Unstoppable leads on maintenance & community. ### Are Aider and Unstoppable open source? Aider is open source (Apache-2.0). No open-source release is listed for Unstoppable. ## For agents - This comparison as JSON: https://www.anchorterminal.com/compare/aider-vs-unstoppable.json, and with the fewest tokens: https://www.anchorterminal.com/compare/aider-vs-unstoppable.min.md - Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "aider", "b": "unstoppable"}`. From a terminal: `anchor compare aider unstoppable` - Each listing in full: https://www.anchorterminal.com/api/v1/tools/aider.json and https://www.anchorterminal.com/api/v1/tools/unstoppable.json ## Other comparisons with Aider or Unstoppable - [Agent Zero vs Aider](https://www.anchorterminal.com/compare/agent-zero-vs-aider.md) - [Agent Zero vs Unstoppable](https://www.anchorterminal.com/compare/agent-zero-vs-unstoppable.md) - [Aider vs Amp](https://www.anchorterminal.com/compare/aider-vs-amp.md) - [Aider vs Antigravity CLI](https://www.anchorterminal.com/compare/aider-vs-antigravity-cli.md) - [Aider vs Auggie CLI](https://www.anchorterminal.com/compare/aider-vs-auggie.md) - [Aider vs Claude Code](https://www.anchorterminal.com/compare/aider-vs-claude-code.md) - [Aider vs Cline](https://www.anchorterminal.com/compare/aider-vs-cline.md) - [Aider vs Crush](https://www.anchorterminal.com/compare/aider-vs-crush.md) - [Aider vs Cursor CLI](https://www.anchorterminal.com/compare/aider-vs-cursor-cli.md) - 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[Unstoppable vs Warp (Warp Agent CLI and the Oz Agent API)](https://www.anchorterminal.com/compare/unstoppable-vs-warp.md) --- Query this catalogue directly over MCP: https://www.anchorterminal.com/mcp (Streamable HTTP, no key). How: https://www.anchorterminal.com/agents/#mcp