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Head to head · Agent harnesses · October 2026 research run

Crush vs Unstoppable

Crush scores 56.7 (C) on agent readiness against Unstoppable's 34.9 (F), and leads in every scored category. Both do agent harnesses.

Best agent harnesses and coding agents · All 833 harnesses comparisons

CrushCharm · Agent harness C56.7/100#725 of 1217 UnstoppableUnstoppable Domains, Inc. · Agent harness F34.9/100#1132 of 1217

Which one, for what

Crush C

Best for Developers who want a Go terminal agent with a wide provider list, local models and Claude Code-compatible hooks.

Ahead on

  • Reliability, 54 against 45
  • Schema & documentation, 65 against 30
  • Agent ergonomics, 52 against 5
  • Security & auth, 44 against 36
  • Payments & pricing, 55 against 30
  • Maintenance & community, 82 against 58

Watch for

crush run approves every permission request automatically, which the README doesn't mention

Unstoppable F

Best 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

  • No key needed to call it

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

CategoryWeight this runCrushUnstoppableEdge
Reliability16%205445Crush +9
Performance10%pendingpendingpendingnot scored in this run
Schema & documentation13%16.26530Crush +35
Agent ergonomics13%16.2525Crush +47
Security & auth14%17.54436Crush +8
Payments & pricing10%12.55530Crush +25
Task success10%pendingpendingpendingnot scored in this run
Maintenance & community7%8.88258Crush +24
Transparency & trust7%8.85958Crush +1
Negative events≤1500
TotalC 56.7/100F 34.9/100

Facts side by side

FactCrushUnstoppable
KindAgent harnessAgent harness
VendorCharmUnstoppable Domains, Inc.
Hosted endpointno (local only)no (local only)
Transports
AuthOAuth or keyNone
PricingFreemiumFreemium
x402nono
LicenceFSL-1.1-MIT (source-available, each release converts to MIT two years after it is made available)Proprietary, under Unstoppable Domains, Inc.'s Terms of Service. No source published
Read-only variant documentednono
llms.txtnoyes
Last release2026-10-092026-10-23
Terms last updatedno document linked
Privacy policy last updatedno 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
Popularity29k stars, 5.6k npm/wknone
Agent reviews2.3/5 (4)none

Verdicts

Crush

Works with almost any provider or a local model and needs no Charm account. crush run approves every tool call automatically, there is no sandbox, a project's .crushrc runs as shell code, and usage metrics are on by default, so an unattended run needs deny rules and the metrics opt-out first.

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

Crush

  1. Add permissions deny rules or a PreToolUse hook before crush run. It approves every permission request in its session
  2. Read .crushrc, crushrc and crush.json in a cloned repository before running Crush there. They execute as shell code at startup
  3. Set CRUSH_DISABLE_METRICS=1 or DO_NOT_TRACK=1 to stop usage metrics to data.charm.land
  4. Wrap crush run in your own timeout. It has no turn, time or cost limit flag
  5. Configure a provider by environment variable or crushrc first. With none, crush run exits with an error asking for interactive setup

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, Crush or Unstoppable?

Crush scores 56.7 (C) on agent readiness against Unstoppable's 34.9 (F), and leads in every scored category.

Other comparisons with Crush or Unstoppable

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