Short answer: Bolt.new is the better choice for prototypers who want to try five app ideas this week without paying, and who are comfortable steering an AI through the rough edges. v0 by Vercel is the better choice for developers and technical founders who want the AI to produce code they would have written themselves, on a stack they already deploy to. On price, Bolt.new starts at $25/mo and v0 by Vercel at $30/user/mo. Full table, real strengths and real limitations below — and a third option at the end if neither is quite the shape you need.
| Area | Bolt.new | v0 by Vercel |
|---|---|---|
| What it is | StackBlitz's in-browser AI app builder: prompt it and a full-stack app is written, run and deployed without leaving the tab. | Vercel's AI builder for full-stack apps and UI: prompt or sketch a screen and get production-grade React, Tailwind and shadcn/ui code that deploys to Vercel. |
| Free tier | 1M tokens per month with a 300K daily limit — the most generous free allowance among the AI builders. | $5 of included monthly credits with a 7-message-per-day limit. |
| Entry price | $25/mo | $30/user/mo |
| Best for | Prototypers who want to try five app ideas this week without paying, and who are comfortable steering an AI through the rough edges. | Developers and technical founders who want the AI to produce code they would have written themselves, on a stack they already deploy to. |
| Strongest at | The most generous free tier of any AI app builder here — 1M tokens/month without paying | The cleanest, most idiomatic frontend code of any builder here — a real developer would ship it |
| Biggest limitation | Tokens are consumed by failed attempts, so error loops are expensive | Priced per seat, so a two-person team pays $60/mo before anything is built |
| The number worth knowing | Bolt.new's free tier gives 1M tokens per month, and Pro at $25/mo starts at 10M tokens with unused tokens rolling over. | v0's free tier caps you at 7 messages per day; Plus is $30 per user per month including $30 of credits. |
Prices and claims about Bolt.new and v0 by Vercel were checked against the sources below on 2026-08-30: Bolt.new — pricing page · Bolt.new — product homepage · v0 — pricing page. Pricing changes: the number on their own site wins over the number on ours. Product names are trademarks of their owners; these are independent comparisons.
Bolt.new is the best free way to find out whether an app idea is buildable, and the token rollover on Pro is the fairest metering in the builder category. What it does not do — like every builder here — is tell you whether the thing is worth building; it will happily burn 10M tokens on a product with no market. Use Bolt to answer "can this be built and how hard is it". Use kitty.build to answer "should it be", and then to keep the answer alive after launch with a site on your domain, code in your repo and daily operating cycles.
v0 produces the best frontend code in this comparison and it is the right choice for anyone technical who lives on Vercel. It is also the most explicitly a tool rather than a co-founder: per-seat pricing, a seven-message free tier, and no opinion at all about whether your product should exist. kitty.build sits at the opposite end — it will argue with your idea before it writes a line, and it keeps running the venture after launch. If you can code and want leverage, use v0. If you want judgement and operations, that is a different purchase.
kitty.build is the only tool in this set that both refuses to build a bad idea and builds the good one. Nine boards research the live web, cite what they find and return a GO / PIVOT / NO-GO verdict for free; if the verdict is GO, the same product ships the site on your domain, writes the code into your GitHub repo and runs daily cycles where a task only counts as done with evidence attached. The trade is that it is a subscription and it is opinionated. If you want a single document, or you want to art-direct every pixel yourself, something else on this list fits you better.
If what you want is exactly what Bolt.new or v0 by Vercel is best at, buy theirs — we say so on every page. If the gap you keep hitting is that nothing checks whether the idea is worth building, that is the gap kitty.build was built for, and the first verdict costs nothing.
Nine boards research the live market, cite every claim and return GO / PIVOT / NO-GO — free, no card. Then pick your builder, or let Kitty ship it.
Start free — no cardNo revenue share, ever · Failed tasks are free · Your repo, your domain, your data