If you have spent an afternoon comparing Lovable, Bolt, v0, Cursor, and Replit, you have probably noticed the marketing pages all sound similar. "Describe your app, get your app." In practice, these five tools do three quite different jobs, and picking the wrong one for what you are actually trying to build wastes real time. Here is the honest breakdown, and what to expect from each once you are past the demo.
The short answer
- Lovable, Bolt, and Replit are full-stack generators. They produce a working front end and a working backend (auth, a database, storage) from a prompt. They differ mainly in where that backend runs and how production-ready it is by default.
- v0 is a UI-only generator. It produces polished React and Tailwind components, not a backend, not auth, not real data.
- Cursor is not a generator at all. It is a code editor with AI assistance, built for a developer who is already writing and reviewing code, not for someone who wants an app to appear from a description.
- Whichever one you use, the output is a fast, convincing first version, and every one of them needs a hardening pass before you point real users at it.
Lovable, Bolt, and Replit: full-stack, but not the same underneath
These three get grouped together because they all promise the same headline: describe the app, get the app, backend included. The differences show up once you look at what "backend" means in each case.
Lovable generates a React front end paired with a Supabase backend, so you get auth, a database, and storage wired up automatically. The most common failure we see is Supabase Row-Level Security left off or misconfigured, which means data that should be private, other users' records, admin data, is readable or writable by anyone. It is invisible in the demo and painful the first time someone finds it. If this sounds like your project, our Lovable fix-up work covers exactly this pattern.
Bolt runs a full Node.js sandbox in the browser using WebContainers, so it can generate and preview a full-stack app instantly, without any local setup. The catch is in that word "sandbox": what gets built is shaped for the in-browser demo, not for real traffic, real secret management, or a production deployment. Moving a Bolt project to something that can actually take load and handle credentials safely is usually the first real piece of work. We cover the specifics on the Bolt fix-up page.
Replit, through Replit Agent, scaffolds, runs, and hosts the app inside Replit's own environment. That is genuinely convenient for getting something live fast. The tradeoffs are that secrets and access controls tend to get treated casually inside the sandbox, and the app ends up tied to Replit's hosting rather than infrastructure you actually own and can move. If you are trying to get a Replit project onto infrastructure you control, that is the situation our Replit fix-up work is built for.
None of this means these tools are bad. It means they are optimized for "get something working and visible", which is a genuinely useful and different goal from "get something safe to run with real users and real money."
v0: a UI generator, not an app generator
v0, built by Vercel, is worth understanding on its own terms because it gets lumped in with the full-stack tools and it is not one. It generates React and Next.js components styled with Tailwind and shadcn/ui, and it is very good at that specific job. What it does not do is generate a backend, authentication, or real data handling.
The common failure is predictable once you know this: a polished-looking screen with mocked data, a sign-up form that does not actually create an account, buttons that go nowhere. That is not a flaw in v0, it is simply outside what it was built to do. If you have a v0 interface and now need it connected to something real, that gap is the work, and our v0 fix-up page walks through what that involves.
If your project is genuinely front-end-only, v0 can be exactly the right tool. The mistake is assuming a good-looking UI means the app is further along than it is.
Cursor: not a generator, an editor for someone who already codes
Cursor deserves a category of its own because it is not trying to do what the other four do. It is a VS Code-based editor with inline completion and an agent mode, built for a developer who reads, accepts, or redirects the AI's suggestions line by line. Nothing appears from a one-line prompt. A person who understands the codebase is still driving.
That makes Cursor a poor fit if you are a non-technical founder hoping to skip hiring a developer entirely. It is a strong fit if you already have an engineer, or are one, and want AI to move faster inside a project someone is actively steering. The common failure with Cursor is subtler than the others: without architectural direction, a codebase accumulates inconsistent patterns from many individually-reasonable accepted suggestions, occasional hallucinated APIs slip through review, and test coverage stays at zero because nothing forced the question. Our Cursor cleanup work usually starts by finding where those inconsistencies pile up.
The pattern behind all five tools
Look past the branding and a pattern holds across every one of these: the tool gets you from nothing to something fast, and that something looks far more finished than it is underneath. That is not a criticism of any single product. It is what happens whenever generation speed and production hardening are two different problems, and the demo only proves the first one was solved.
The gap shows up in the same places regardless of which tool produced the app: authentication that was never actually locked down, database rules that trust the client, secrets sitting somewhere they should not, no real test coverage, and a deployment shaped for a demo rather than for traffic and real users. This is the exact ground our vibe-code cleanup work covers, and it is not specific to one tool. We built tool-by-tool fix guides precisely because the failure pattern differs slightly by generator, even though the underlying story, fast start, missing hardening, is the same everywhere.
Key takeaways
- Lovable, Bolt, and Replit generate a working full stack, but each has its own weak point: RLS misconfiguration, sandbox-only backends, and hosting lock-in, respectively.
- v0 builds UI only. A polished screen from v0 is not evidence of a working backend.
- Cursor is an editor for developers, not a generator for founders without one. It needs someone steering it.
- Every one of these tools needs a security and production-readiness pass before real users and real data show up. That is normal, not a sign you picked wrong.
Your next step
Picking the right tool for the job matters, but it is not the last decision you will make. Whichever of these you used, or are about to use, the honest next question is what it will take to get the result production-ready: locked-down data access, a backend built for real traffic, and tests that let you change things without gambling. Browse the specifics for your stack on /fix, or if you would rather start with a straight read on where your project actually stands, our vibe-code cleanup work exists for exactly this handoff point. Send us a short note through contact and we will tell you, plainly, what a free written first read would find.