Bolt vs Replit: build and launch an app with AI
Bolt gets a web prototype on screen fastest: you describe the app, it writes the full-stack code, runs it in your browser and deploys in one click. Replit suits an idea that has to keep running, because its agent plans and builds the app and the workspace already includes a database, hosting and secrets storage. Build the same small app in each before you commit, which costs nothing on either. For a same-day demo pick Bolt, for a small tool people will use pick Replit.
Which one to pick
You want a clickable web prototype for a pitch or a customer test today, or you plan to plug in Supabase for data and push the code to GitHub.
Your app needs somewhere to store data and keys from day one, or you are building a small internal tool that has to stay online after the demo.
Side by side
Questions
Do I need to know how to code to use Bolt or Replit?
No, both start from a plain description of the app you want. You keep prompting to add or change features. Knowing some code helps once something breaks, since both let you open the files and edit them yourself.
Which one handles the database better?
Replit has a database built into the workspace, so your app can save data without extra setup. Bolt connects natively to Supabase when your app needs a backend. If you already like Supabase, Bolt fits well; if you want nothing else to sign up for, Replit is simpler.
Can I take my code elsewhere later?
Yes. Both connect to GitHub, so the code can live in your own repository. From there a developer can carry on in any editor. Push early so you keep a history of what the AI changed.
Are Bolt and Replit free?
The free tier on either is enough to test an idea. We do not quote paid prices here because they change and depend on how much AI work you use. Build one small app in each on the free tier before paying for either.
Who makes Bolt?
Bolt is the AI app builder from StackBlitz, the company behind the in-browser development environment. That is why your app runs live in the browser tab with nothing to install. Replit also runs fully online, through its own cloud workspace.