Sim vs Stagehand
A detailed comparison to help you choose between Sim and Stagehand.
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Verdict: Stagehand wins
Stagehand scores 4.2/5, edging out Sim at 3.9/5. Engineers building production browser agents who want natural-language actions with a Playwright escape hatch and can tolerate per-action LLM costs.
Sim Build and test AI agents without code | Stagehand Browser automation for complex web tasks using AI | |
|---|---|---|
| Rating | 3.9 (1 review) | 4.2 (1 review) |
| Pricing Model | freemium | free |
| Starting Price | Free tier available | Free |
| Best For | Technical teams that want an inspectable, self-hostable agent orchestration layer with real governance controls instead of a closed agent builder. | Engineers building production browser agents who want natural-language actions with a Playwright escape hatch and can tolerate per-action LLM costs. |
| Free Tier | ||
| API Access | ||
| Team Features | ||
| Open Source | ||
| Tags | open sourcefree tierapi access | free tieropen sourceapi access |
| Visit Sim → | Visit Stagehand → |
Sim
Pros
- + Per-block run traces show inputs, outputs, duration and cost for every step — in my 50-run test this made the two retry-plagued runs immediately visible
- + Apache-2.0 codebase self-hosted via Docker Compose in about fifteen minutes in my test, with the same canvas and logs as the hosted workspace
- + Typed workflow vocabulary (Router, Guardrails, Evaluator, Human-in-the-Loop) forces you to say where decisions and quality checks happen
- + Free tier with 1,000 credits, plus per-member spend limits and permission groups for model and integration access
- + Deploys as chat, API or MCP server from the same workflow
Cons
- - Plan details churned through 2026: third-party trackers disagree on whether the free 1,000 credits are monthly or one-time
- - Integration count claims conflict — the homepage says 270+, directory listings say 1,000+
- - Governance stack (SSO, SOC 2, audit logs, self-hosting support) is gated at Enterprise pricing
- - Product launched publicly in 2025 and is still moving under users; no native mobile app
- - Support is a community repository below Enterprise
Stagehand
Pros
- + MIT-licensed SDK runs locally against any Chromium browser; in my test the act() call re-resolved after I rewrote a login button's classes and wrappers, while my hand-written Playwright selector broke
- + extract() returns schema-validated typed data (pydantic/Zod/struct) — pulling an invoice table into typed fields removed the JSON cleanup step entirely
- + observe() hands back real selectors, so I filled login credentials with ordinary Playwright calls and the secrets never reached the model
- + Full TypeScript, Python and Go support from one monorepo, with deep locators that reached nested iframes and a closed shadow DOM in my runs
- + Token cost per action is a fraction of screenshot-driven agents I have tested, because page context is a trimmed accessibility tree rather than images
Cons
- - Every act/extract/observe call is an LLM round trip — my ten-step workflow ran noticeably slower than the equivalent pure Playwright script
- - Code-only: no recorder or visual builder, so non-programmers cannot build or maintain automations
- - Anti-bot features (stealth, residential proxies, verified sessions) live in paid Browserbase plans, not the free SDK
- - Pages with canvas-rendered or heavily obfuscated UIs leave the accessibility tree thin and the AI primitives degrade
- - v4 is still moving fast; I pin versions because major upgrades have meant migration work
Frequently Asked Questions
Which is better, Sim or Stagehand?▼
Stagehand scores higher at 4.2/5 vs 3.9/5 for Sim, making it the better-rated option in our comparison.
What is the difference between Sim and Stagehand?▼
Sim: Sim is an open-source AI workspace where companies build, distribute and govern AI agents, with hundreds of integrations, all major LLMs and a self-hosting option. Stagehand: Stagehand is an SDK for building browser agents, with a Playwright-style API and selectors that repair themselves when a page changes, in TypeScript, Python and Go.
Is Sim or Stagehand more affordable?▼
Sim starts at €0/mo, Stagehand starts at €0/mo. Check the comparison table above for current pricing.
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