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If you want a Debugg.ai alternative that checks your coding agent's page changes from inside the app (requests, state, console), runs on your own machine, and replays without a model, Reticle is built for that. If you want very cheap, zero-config AI tests in managed remote browsers with a free tier for public repos, Debugg.ai is the stronger choice.
What Debugg.ai does
Debugg.ai's site says "Better apps. Happier users." and pitches "AI App Testing, No Code Needed" (debugg.ai). You connect the app once, and an AI agent explores it like a user, runs plain-English tests in managed remote browsers, and returns pass or fail with screenshots and video, including comments on pull requests. It can tunnel to a local dev server, so you do not have to deploy first.
Its MCP server, with a tool called debugg_ai_test_page_changes, works with Claude, Cursor and Codex and is open source under Apache-2.0 (debugg-ai-mcp); the platform is closed. Pricing is public: free for 100 tests a month on public repos, Pro at $20 a month, Grow at $40 a month, and Enterprise on request (checked 2026-10-25).
What Reticle does
Reticle checks an AI coding agent's change from inside the running web app and returns a verdict with evidence. It reads the network calls, the application state and the console, and on React and Svelte it names the file:line to fix.
Your agent calls it through MCP while it works. Flows it drives are saved and replay deterministically, with no model in the loop. The SDK is open source (Apache-2.0) and runs on your machine; the hosted platform runs the same checks on previews and pull requests.
Debugg.ai vs Reticle at a glance
| Debugg.ai | Reticle | |
|---|---|---|
| Where it looks | Remote browser, outside the app | Inside the app (SDK), plus a driven browser |
| Where it runs | Its managed browsers, tunnelled to your dev server | Your machine, CI, or the hosted platform |
| What a check reads | What the page shows, with screenshots and video | Network count, app state, console and DOM after each step |
| Re-running | The agent runs the tests again | Deterministic replay, no model in the loop |
| Points to the fix | Pass or fail with recording | The failing request or state, and file:line on React and Svelte |
| Open source | MCP server Apache-2.0; platform closed | SDK Apache-2.0; server FSL-1.1 |
| Pricing | Free (public repos); from $20/month | Start free, no card; open-source SDK free |
Where Debugg.ai is the better choice
- You want the lowest entry price. A free tier for public repositories and $20 a month for Pro.
- You want nothing in your build. Debugg.ai needs no SDK. Reticle drives sites without its SDK too, but app state and file:line need it.
- You want a managed browser. Tests run in its remote browsers, tunnelled to your dev server, so there is no browser to run yourself.
- You want plain-English tests that an agent explores like a user.
Where Reticle is the better choice
- The failure is under the screen. A request sent twice, a write that never persists, a store that disagrees with the page. A screenshot of each looks right; Reticle reads them.
- You want the source line. On React and Svelte the verdict names the
file:line, so the agent edits the right file. - You want re-runs that cannot flake. Eight replays gave one verdict, and four flows re-verify in about 480 tokens, about 251 times less than a model re-driving them.
- You want the check to stay on your machine. The SDK runs locally; nothing from your app leaves it unless you link a project.
On 88 seeded bugs, Reticle caught 85 with no false alarms, with one genuine miss (scorecard).
Can you use both?
Yes. Debugg.ai can explore the app like a user and comment on pull requests, while Reticle reads what each step did inside the app. Why the two answers differ is covered in why a green check isn't proof. Related: the TestSprite alternative and all alternatives.
Try Reticle in five minutes
Paste one line to your coding agent, and it installs and wires the SDK in your app:
Follow https://raw.githubusercontent.com/reticlehq/reticle/main/SKILL.md
Or run npx @reticlehq/core init yourself. The README has the details.
FAQ
What is the best alternative to Debugg.ai?
The best alternative to Debugg.ai depends on what you want checked. For checks inside your web app that your coding agent runs, reading network, state and console with the source line, Reticle fits. For hand-written cross-browser tests, Playwright fits. For another low-cost managed AI browser tester, look at other AI QA agents.
How is Reticle different from Debugg.ai?
Reticle is different from Debugg.ai in where it looks and runs. Debugg.ai explores the app in managed remote browsers and reports pass or fail with recordings. Reticle runs inside the app on your machine, checks requests, state and console after each step, names the source line on React and Svelte, and replays saved flows with no model.
Is Debugg.ai open source?
Debugg.ai is partly open source: its MCP server is Apache-2.0 on GitHub, while the testing platform is closed. Reticle's in-app SDK is open source under Apache-2.0 and runs locally, and its server is source-available under FSL-1.1, which becomes Apache-2.0 after two years.
Can Reticle test my local dev server?
Yes, Reticle tests your local dev server directly. Its SDK connects to a bridge on your machine, and your coding agent drives the app and reads the verdict through MCP, with no tunnel and no deploy. The same saved flows replay in CI with npx @reticlehq/server verify.
Why Reticle
Your agent says it works. Reticle checks.
- Checks each change inside the running app: network, state and console, not a screenshot.
- Returns a pass or fail with the evidence and the file:line to fix.
- Open-source SDK on your machine, or the platform on every preview and PR.
No credit card required.