VibeEval is your go-to tool for catching bugs, securing your code, and stress-testing your vibe-coded apps built with tools like Lovable, Cursor, and Bolt. Its AI agents simulate real users, run full browser tests, and sniff out vulnerabilities so you can launch with confidence. Here are some practical use cases to show how VibeEval keeps your projects tight.
1. Catching UI Bugs in a Lovable-Generated Landing Page
You've just used Lovable to whip up a sleek landing page for your new e-commerce store. You described it in plain English, and boom—Lovable generated a responsive React app with Tailwind CSS. It looks dope, but you're worried about broken links, misaligned buttons, or forms that don't submit on mobile.
How VibeEval Helps:
- AI Browser Testing: VibeEval's agents crawl your landing page in multiple browsers (Chrome, Firefox, Safari) and devices (desktop, iPhone, Android) to check for UI glitches, like buttons that don't click or images that don't load.
- Regression Testing: After you tweak the design with another Lovable prompt, VibeEval re-runs tests to ensure your changes didn't break anything, like a form that now fails to validate.
Outcome: You catch a mobile menu that doesn't collapse on iPhones and a checkout button that's unresponsive on Firefox, fixing them before launch.
Why It Matters: Lovable's no-code approach is great for speed, but AI-generated UI can have quirks. VibeEval ensures your page looks and works perfectly for every user.
2. Stress-Testing a Bolt Full-Stack App
You used Bolt to build a Next.js app with a login system and Supabase backend in minutes—zero setup, just vibes. It's a Micro SaaS for tracking crypto portfolios, and you're stoked to deploy. But what if the app crashes under heavy traffic or the login flow fails for some users?
How VibeEval Helps:
- Load Testing: VibeEval simulates hundreds of users hitting your app simultaneously, checking if your Supabase auth and API endpoints hold up or choke.
- Functional Testing: AI agents test the entire login flow—sign-up, password reset, and session persistence—across different scenarios (e.g., wrong password, expired token).
- Security Checks: VibeEval scans for common vulnerabilities, like exposed API keys or unvalidated inputs, that Bolt's one-click deployment might overlook.
Outcome: You discover the app slows down when 50+ users query the portfolio API at once and fix it by optimizing a database query. Plus, VibeEval flags an XSS vulnerability in a user input field.
Why It Matters: Bolt's rapid prototyping is perfect for MVPs, but untested apps can buckle under real-world use. VibeEval ensures your app scales and stays secure.
3. Validating Cursor's AI-Generated Code Changes
You're a developer using Cursor's Composer feature to refactor a React app. You asked it to add a new feature—a real-time chat module—and Cursor edited multiple files like a pro. But you're nervous: did Cursor's AI introduce bugs or break existing functionality?
How VibeEval Helps:
- Code Diff Testing: VibeEval analyzes Cursor's changes (via diffs) and runs targeted tests on modified files, ensuring the new chat module doesn't break the app's core features.
- End-to-End Testing: AI agents simulate users sending messages in the chat, checking if WebSocket connections stay alive and messages display correctly.
- Regression Suite: VibeEval re-runs your existing test suite to confirm Cursor's edits didn't mess up unrelated parts, like the user profile page.
Outcome: You catch a bug where the chat crashes if a user sends an emoji and a regression where the profile page fails to load after Cursor's refactor.
Why It Matters: Cursor's AI is a coding superpower, but its autonomous edits can be overzealous. VibeEval keeps those changes in check, so you don't ship broken code.
4. Ensuring Cross-Platform Consistency for a Collaborative Lovable Project
Your team used Lovable to build a collaborative task management app, with real-time editing and GitHub integration. Everyone's vibing, tweaking the UI via Lovable's visual editor. But with multiple team members prompting changes, you're worried about inconsistent behavior across platforms.
How VibeEval Helps:
- Cross-Platform Testing: VibeEval's AI agents test the app on Windows, macOS, and Linux, plus mobile browsers, to ensure the UI and functionality (e.g., task creation, real-time updates) work everywhere.
- Collaboration Validation: It simulates multiple users editing tasks simultaneously, checking if Lovable's Supabase backend syncs data correctly without conflicts.
- Prompt Iteration Safety: After a team member updates the UI with a new prompt, VibeEval runs regression tests to ensure the change doesn't break existing features, like task filtering.
Outcome: You find that real-time updates lag on Safari and a new button added via prompt breaks the layout on Android. You fix both before stakeholders notice.
Why It Matters: Lovable's collaborative features are great for teams, but rapid changes can lead to chaos. VibeEval keeps your app consistent and reliable.
5. Securing a Bolt App Before Public Launch
You built a social media dashboard with Bolt, letting users connect their X profiles to track analytics. It's ready to go public, but you're paranoid about security flaws—could hackers exploit your vibe-coded app?
How VibeEval Helps:
- Vulnerability Scanning: VibeEval's AI scans your Bolt-generated code for OWASP Top 10 issues, like SQL injection or insecure API calls to X's endpoints.
- Penetration Testing: AI agents attempt to break your app by submitting malicious inputs (e.g., script tags in forms) or bypassing auth checks.
- API Testing: It validates that your X API integration handles rate limits and token refreshes correctly, preventing outages or data leaks.
Outcome: VibeEval flags an unescaped input field vulnerable to XSS and an API call that exposes sensitive user data. You patch both before launch.
Why It Matters: Bolt's browser-based coding is fast, but security isn't its focus. VibeEval acts like a hacker, catching risks before they become disasters.
6. Debugging a Cursor-Generated Game
You used Cursor to vibe-code a 2D Zelda-like game in Replit, prompted with: "Create a 2D game with combat and enemy AI." Cursor delivered, but players report bugs—sometimes the player can't move, or enemies freeze.
How VibeEval Helps:
- Gameplay Testing: VibeEval's AI agents play the game, simulating player actions (moving, attacking, interacting with enemies) to replicate reported bugs.
- Error Logging: It captures runtime errors and stack traces, pinpointing where Cursor's AI-generated code fails (e.g., a null reference in the enemy AI logic).
- Regression Testing: After you prompt Cursor to fix the bugs, VibeEval re-tests to ensure the fixes don't introduce new issues, like broken combat animations.
Outcome: You fix a bug where the player gets stuck on certain tiles and an enemy AI loop that crashes on low-end devices.
Why It Matters: Cursor's great for complex projects like games, but AI-generated logic can be brittle. VibeEval ensures your game is fun, not frustrating.
Why VibeEval + Vibe Coding Tools = A Winning Combo
- Speed Meets Stability: Lovable, Cursor, and Bolt let you build fast; VibeEval ensures you don't sacrifice quality.
- Non-Coder Friendly: Even if you're not a dev, VibeEval's AI does the heavy lifting, catching issues you might miss.
- Scales with You: From quick prototypes to production apps, VibeEval's tests grow with your project's complexity.
- Peace of Mind: Launch knowing your app won't crash, leak data, or frustrate users.
Tips for Using VibeEval with Lovable, Cursor, and Bolt
- Be Specific with Prompts: Just like vibe coding, clear test prompts (e.g., "Test the login flow for invalid inputs") get better results.
- Iterate Often: Run VibeEval after every major prompt or code change to catch issues early.
- Use the Community: Check X for VibeEval tips from other vibe coders, especially for tricky integrations like Supabase or X APIs.
VibeEval's AI agents are like your personal QA team, breaking your app before hackers or users do. Whether you're vibing with Lovable's no-code magic, Cursor's developer-friendly AI, or Bolt's full-stack power, VibeEval's got your back.