Tl;dr

We've built an AI testing agent that lets anyone on your team—engineers, PMs, and QA—create and maintain tests without writing code.

❌ The Problem / ✅ Our Value

Stop shipping bugs. Stop waiting for tests. Stop fixing broken test suites.

Stably is an AI QA engineer that understands your product, tests intelligently, and integrates seamlessly into your workflow.
https://youtu.be/p-cjcxjTH-E

💪 Our 3 Core Strengths

1. ⚡ Speed: 10x Faster Testing

• Smart test selection: Our AI analyzes PR diffs and runs only affected tests—when you change checkout, we test checkout, not your entire suite
• Automated test creation: Tests that once took hours of hand-coding in Playwright or Cypress now generate automatically in under 10 minutes.
• Intelligent caching: Tests run in cached Playwright until your app changes, then auto-heal

2. 🎯 Accuracy: AI That Actually Understands Your Product

• 99.7% assertion accuracy by learning from your Notion docs, Google Drive specs, PostHog recordings, and Git history
• Context-aware testing: Tell Stably "test checkout with expired coupons" in plain English—it knows what checkout means in YOUR app
• Catches real bugs: Not just UI changes, but actual business logic failures

3. 🧩 Easy Integration: Works for Everyone, Everywhere

• No-code for all teams: PMs describe tests in English, QAs point-and-click to show flows, and engineers get PR-ready tests
• One-click GitHub app or use our API for GitLab, local CLI, and Cursor MCP (upcoming)
• Human-in-the-loop: When AI needs help, anyone can step in and show it what to do—no coding required

💥 Real Impact

• OpenArt scaled from $0 to $16M ARR with just 10 employees using Stably
• Tofu saves 40+ engineering hours per week after migrating from Playwright
• Multiple customers replaced six-figure QA contracts, cutting testing costs by 80%

"I actually love testing now after switching to Stably" — Senior Engineer, Curebase (YC W18)

👩🏻‍💻🧑‍💻 About Us

Jinjing (CEO): Built the testing & release infrastructure that ships Google Chrome to billions of users

Neil (CTO): One of Uber's youngest Tech Leads; led multiple large-scale ML projects on Uber's Safety team

We've assembled a team of PhD graduates specializing in AI’s application in software reliability, plus ex-founders who've previously built and sold an AI startup.

🎉 Launch Week Special

We're looking for teams who:

• Wait too long for PR tests to run
• Have PMs/QAs who want to contribute to testing but can't code
• Are tired of updating tests every time they ship

Get the first month free on our starter plan. Just mention "YC Launch" when signing up.

Sign up or schedule a demo at stably.ai or contact us at jinjing@stably.ai