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If you want a heal.dev alternative that checks the specific change your coding agent just made, inside the running app, Reticle is built for that. If you want an agent that hunts bugs and vulnerabilities across your whole product in a production-like sandbox, Heal is the stronger choice.
What Heal does
Heal says: "Code review reads the diff; Heal runs the product. It builds a sandbox that replicates production and finds reproducible bugs and runtime vulnerabilities, each with the failing test that proves it" (heal.dev). You connect GitHub; it maps the product, mocks third parties such as Stripe and Slack, and files only issues a failing test reproduces. It runs locally or in the cloud.
Heal earlier sold an AI-plus-human service writing Playwright tests, so this is a newer direction (changelog). Pricing is not public (free trial, free credits for open source; checked 2026-10-25). It is not open source, and we found no MCP integration.
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. It also drives sites you don't own, reading network, console and DOM there; app state and file:line need its SDK in your build. The SDK is open source (Apache-2.0); the hosted platform runs the same checks on previews and pull requests.
Heal vs Reticle at a glance
| Heal | Reticle | |
|---|---|---|
| Goal | Hunt bugs and vulnerabilities across the product | Verify that a specific change did what it should |
| Environment | A production-like sandbox with mocked third parties | Your running dev or preview app |
| Output | Issues, each with a failing test | A verdict with evidence per flow |
| What it reads | The running product, from its sandbox | Network, app state, console and DOM after each step |
| Agent integration | None documented | MCP tools the agent calls while it works |
| Open source | No | SDK Apache-2.0; server FSL-1.1 |
| Pricing | Not public | Start free, no card; open-source SDK free |
Where Heal is the better choice
- You want bugs found that nobody was looking for. Heal explores the product broadly. Reticle checks the flows your agent drives and the changes it makes.
- You want security findings. Heal reports runtime vulnerabilities. Reticle is not a security scanner.
- You want a sandbox with third parties mocked. Heal builds one for you.
- Every finding should ship with a failing test. That is Heal's rule.
Where Reticle is the better choice
- You want this change checked before the PR. Reticle runs in the agent's session and checks the flow it just changed.
- You want a pass, not only bug reports. Reticle returns pass, fail or cannot tell with evidence for each flow.
- You want the fix location. The verdict names the failing request or state and, on React and Svelte, the source line.
- You want re-runs that cannot flake. Saved flows replay with no model in the loop: eight replays, one verdict, about 480 tokens for four flows.
On 88 seeded bugs, Reticle caught 85 with no false alarms; two of the other three are traps a correct tool must not flag, and one is a genuine miss. The method is in the benchmark scorecard.
Can you use both?
Yes. Heal looks for what is broken anywhere; Reticle proves the thing you just changed works. One is a search, the other a check.
See exploratory testing, rebuilt for agents for how the two kinds of testing fit together, and all alternatives for other tools.
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 Heal.dev?
The best alternative to Heal.dev depends on the job. For broad AI bug hunting or managed end-to-end coverage, look at QA Wolf, Momentic or other AI QA agents. For checking that a coding agent's specific change worked inside the running app, through network, state and console with the source line to fix, Reticle fits.
What does Heal.dev do?
Heal.dev builds a sandbox that replicates production, mocks third parties such as Stripe and Slack, and runs the product to find reproducible bugs and runtime vulnerabilities. Each issue it files comes with a failing test that proves it. It connects through GitHub and runs locally or in the cloud.
How is Reticle different from Heal.dev?
Reticle is different from Heal.dev in its goal. Heal hunts for bugs across the whole product. Reticle verifies a specific change your coding agent made, reading requests, state and console after each step, and returns a verdict with the source line to fix, so the agent can repair it before review.
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.