Bolt vs Lovable vs Replit vs v0: Which to Use

Every AI app builder demo looks the same: type a sentence, watch a working app appear. The differences that actually matter show up later, when you need to add a database, wire up login, or hand the project to someone else. Here is how Bolt, Lovable, Replit, and v0 handle exactly that.

The four, in one line each

• Bolt.new: full-stack iteration and speed, with real framework choice (React, Vue, Svelte, Astro) and mobile app support through Expo

• Lovable: the fastest path from idea to a deployed app for someone who does not want to see code, with tight Supabase integration built in

• Replit: the only one of the four with a real built-in database and auth system out of the box, aimed at internal tools that need persistent data

• v0: the strongest front-end output of the four, especially for teams already deploying on Vercel

That framing is not just marketing language, it lines up with how each tool is actually positioned in the market. Lovable had reached $400M in annual recurring revenue by February 2026, at a $6.6B valuation after a $330M Series B, largely on the strength of non-technical users shipping real products without touching a terminal.

The test: add auth and a database to a bare prototype

Start each tool from a simple prototype (a single-page form, no persistence) and ask for the same thing: user accounts and a database to store submissions.

Lovable's Supabase integration means this is close to a checkbox: authentication, a Postgres database, and storage arrive without you leaving the chat interface or touching a config file, per a 2026 founder comparison of the category. The tradeoff is that you are now committed to Supabase as your backend, which is a fine default and a real constraint if you already have infrastructure elsewhere.

Replit handles this natively too, since a real database and auth system are built into the platform rather than bolted on through a third party. Replit's Agent 4, which shipped in March 2026, can carry out the whole request in natural language and manage the database and auth wiring directly, which fits Replit's positioning around internal tools that need to persist real data from day one.

Bolt.new can absolutely do this too, but it leans on you specifying more of the stack yourself, which is the same tradeoff that gives it framework flexibility in the first place. You get to choose your database and auth approach rather than inheriting one, at the cost of Bolt doing less of the decision-making for you.

v0 is the weakest fit for this specific test. Its strength is front-end generation, and its full-stack capability, while real, is newer and less deep than Lovable's or Replit's, which shows up exactly at the moment you need backend state, not just a good-looking form.

Where each one is the right call

A common working pattern among developers is not picking one tool permanently at all: use v0 to get UI components right, then Bolt.new to wire the full-stack logic around them, a combination raised in industry coverage of the category. That is a reasonable split if you already write code and just want AI to accelerate specific stages, rather than own the whole build.

What you actually own when you stop paying

This is where the four diverge more than their demos suggest. Bolt.new and v0 both output code you can take with you, React and its ecosystem in Bolt's case, front-end components in v0's, since neither ties your data layer to a proprietary runtime by default. Lovable's output is also real code, but the Supabase backend it wires up is the default path most users never leave, which is a soft lock-in rather than a hard one. Replit is the most tied together of the four: the app, its database, and its hosting live inside Replit's own environment, and pulling all three apart cleanly takes real work.

None of this is a reason to avoid any of them. It is a reason to ask the lock-in question before you are six weeks and a real customer base into a project, not after. Our deeper look at AI app builder vendor lock-in walks through what you can and cannot take with you from each style of tool.

The honest limitation across all four

None of these tools removes the need to understand what your app actually does once it is running in production. Our broader look at the limitations of AI app builders covers this in more depth, and it applies to all four names here equally: fast generation is not the same as an app you can maintain, scale, or debug without help.

If you are weighing an app builder against hiring someone, see our cost breakdown of an AI app builder versus hiring a developer. For the broader category context, our guide on building an app with AI covers the fundamentals these four tools all sit on top of.

FAQ

Which of these four is cheapest?

Bolt.new's entry paid tier starts around $25 a month. Lovable and Replit both offer free tiers with paid plans scaling by usage, and pricing across all four shifts often enough that it is worth checking current plans directly before committing.

Can I switch tools after starting a project?

Not cleanly. Each tool generates code in its own structure and, for Lovable and Replit especially, ties your app to their integrated backend. See our guide on exporting an app from an AI app builder before you assume portability.

Is Replit's Agent 4 the same as the other three tools' AI?

No. Agent 4 is Replit's own agent, built to operate inside Replit's existing database and hosting environment, which is why it handles persistent data natively rather than through a third-party integration.

Do any of these require me to know how to code?

Lovable is the most deliberately built for non-coders. Bolt.new and v0 assume more comfort reading and adjusting generated code. Replit sits in between, usable without code but more powerful if you can read what it produces.