HARPA AI vs Stagehand
A detailed comparison to help you choose between HARPA AI and Stagehand.
🏆
Verdict: Stagehand wins
Stagehand scores 4.2/5, edging out HARPA AI at 4.0/5. Engineers building production browser agents who want natural-language actions with a Playwright escape hatch and can tolerate per-action LLM costs.
HARPA AI Browser automation and data extraction powered by AI | Stagehand Browser automation for complex web tasks using AI | |
|---|---|---|
| Rating | 4.0 (1 review) | 4.2 (1 review) |
| Pricing Model | freemium | free |
| Starting Price | Free tier available | Free |
| Best For | Solo researchers, marketers and operators who want browser-based extraction, page monitoring and scheduled automation without writing code. | 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 | browser extensionno codefree tierbyok | free tieropen sourceapi access |
| Visit HARPA AI → | Visit Stagehand → |
HARPA AI
Pros
- + Web monitors and scheduled commands run real automation — my price monitor fired on a listing change without me touching the tab, which no chat sidebar I tested does
- + Free DEMO tier let me test extraction, monitors and custom commands for two days of real use before paying anything
- + Three connection modes (CloudGPT, free web sessions to ChatGPT/Claude/Gemini, own API keys) meant I could route scheduled tasks through CloudGPT and casual chat through free sessions
- + Extraction to CSV worked first-run on clean listing pages once I enabled the scroll options for infinite-scroll results
- + Runs locally in the browser; the vendor states page data is not stored on its servers, which mattered for client dashboards
Cons
- - Scheduled commands and advanced automation are gated to the $19/month annual tier, so the automation use case costs more than the headline $12
- - Chrome/Chromium only — no Firefox or Safari, and no desktop application control at all
- - Web-session connections are rate-limited and broke twice for me when the underlying chat service changed its page layout
- - The $240 lifetime plan ships with only 30 Megatokens, less than half the cheapest monthly plan's annual allowance
- - No refunds per third-party reviews of the FastSpring checkout, so the DEMO caps are the only real trial
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, HARPA AI or Stagehand?▼
Stagehand scores higher at 4.2/5 vs 4.0/5 for HARPA AI, making it the better-rated option in our comparison.
What is the difference between HARPA AI and Stagehand?▼
HARPA AI: HARPA AI is a Chrome extension that runs several AI models on the current page, summarising, extracting data and automating repeated browser tasks. 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 HARPA AI or Stagehand more affordable?▼
HARPA AI starts at €0/mo, Stagehand starts at €0/mo. Check the comparison table above for current pricing.
Stay in the loop
Get weekly updates on the best new AI tools, deals, and comparisons.
No spam. Unsubscribe anytime.