Jeradin uses on-device screen understanding and semantic code analysis to detect bugs in any vibecoding environment — Lovable, Cursor, Replit, Gemini and beyond. It points to the exact line. It explains the cause. It shows the correction. You stay in control.
const { data: user } = useUser()
- return <h1>Hello, {user.profile.name}</h1>
+ return <h1>Hello, {user?.profile?.name ?? "there"}</h1>useUser() resolves asynchronously, so on the first render user is undefined. Reading .profile.name throws before the fetch completes. Add optional chaining or guard with a loading state.
Most linters catch typos. Jeradin catches intent mismatches — when your code runs but doesn't do what you meant.
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Screen frames and stack traces are processed on-device when possible. Cloud is opt-in for heavy reasoning.