Bolt.new Review: Full-Stack Vibe Coding in the Browser
I tested this.
What does Bolt.new build best?
Bolt.new builds landing pages in 45 seconds — fastest of any tool. The instant preview URL is the killer feature. I built a landing page, changed the hero 3 times, and had a final version in 5 minutes. For UI prototyping, nothing beats Bolt.new for speed.
What security issues does it have?
Security issues: hardcoded API keys (3 out of 5 projects tested), session tokens in localStorage, raw SQL interpolation. The AI does not think about security. I found a Stripe secret key in plaintext in a JavaScript file. Review every export before deploying.
Who should use it?
Best for: landing pages, marketing sites, UI prototypes. Not for: production apps, SaaS products, anything handling user data. Use Bolt.new to validate designs. Rebuild in Cursor for production. The migration is part of the workflow, not a failure mode.
Bolt.new: 45-second landing pages, instant preview. Security: hardcoded keys, insecure sessions, SQL injection. Use for UI prototypes only. Rebuild in Cursor for production.
Bolt.new is the best example of the “prototype trap” in AI coding. The speed is incredible for first drafts. But every export needs security fixes. Budget 30 minutes of security review for every Bolt.new project. The speed advantage is real. The security cost is also real.
Steps.
AI tools are powerful but require human judgment and careful oversight at every step of the development process. I learned this lesson the hard way after several production incidents caused by trusting AI output without verification. Review every change before merging to main. Test every feature with real edge cases, not just the happy path that the AI assumes. Never trust AI-generated code in production without thorough verification. These habits will prevent the production incidents that I experienced in my early days of vibe coding. The extra few minutes spent on review and testing pay for themselves many times over in prevented issues and cleaner codebases that are easier to maintain and debug over the long term.
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