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Up to 4 tools, same rows for each: what it is, what it really costs, the trap, and how to wire it up. The URL carries your picks — send it to anyone.
Bolt.new (StackBlitz)Google Firebase Studioa0.dev
Quick read
- Free with no card: Google Firebase Studio.
| Field | Bolt.new (StackBlitz)bolt.new | Google Firebase Studiofirebase.studio | a0.deva0.dev |
|---|---|---|---|
| What it is | Runs a real Node toolchain inside the browser via StackBlitz WebContainers, so npm install, dev server and terminal all work client-side. Generates Vite, React and Next projects, deploys to Netlify or Vercel, and exports to GitHub or ZIP. A May 2026 Microsoft partnership added Azure deploy and Microsoft 365 integration. | Browser IDE built on Code OSS with an App Prototyping agent that turns a prompt into a Next.js or React app wired to Firebase. Supports Flutter and React Native workspaces plus full Git access to the generated code. Google announced its sunset on 19 March 2026. | Generates real React Native (Expo) projects — actual component files and navigation stacks, not a webview wrapper — with Convex or Supabase for data plus built-in AI inference and image-generation APIs. It runs the build, creates your App Store Connect listing, and uploads it for you. |
| Category | AI app builders | AI app builders | AI app builders |
| Cost tier | mixed | free | mixed |
| Pricing | Free 300K tokens/day, 1M/mo · Pro $25/mo (10M tokens, rollover) · Teams $30/member/mo | Free · 3 workspaces (10 with Google Developer Program, 30 Premium) · Blaze billing for App Hosting | Free (limited messages, 1 project) · Pro $20/mo (100 messages/day) · $50 / $100 / $200 and up |
| Why builders pick it | The closest thing to a real dev environment in a browser tab — you watch and edit the file tree while the agent works. Pick it over Lovable when you want framework freedom and terminal access rather than a guided rail. | Was the cheapest way to get a Gemini-built app sitting directly on Firestore and Firebase Auth with no credit meter anywhere. Only relevant now for finishing and migrating workspaces you already have. | The shortest distance from prompt to an app sitting in review on both stores, because it owns the build and submission step that normally eats a week. Source export unlocks at Pro. |
| Watch out for | Token-metered, and failed builds or error loops still burn tokens. The free tier's 300K daily ceiling is consumed by one meaningful feature. WebContainers cannot run native binaries or Python, so some backends are simply off the table. | Shutting down. New workspaces and signups were disabled 22 June 2026, and the service shuts off 22 March 2027 with remaining data deleted. Google directs users to AI Studio or Antigravity; Firestore and Auth are unaffected. | The free plan caps you at one project and cannot export code — you need Pro to get the source out. Message caps, not compute, are the binding constraint on real work. |
| How to wire it up | Prefix any GitHub repo URL with bolt.new to import it directly. | not logged | Apple Developer Program ($99/yr) and Google Play ($25 one-time) accounts are still required. |
| Editor's pick | No | No | No |
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# Tool comparison — Bolt.new (StackBlitz) vs Google Firebase Studio vs a0.dev Source: Kbaise, a directory of tools that work with Lovable projects. Pick one and tell me why before writing any integration code. ## Bolt.new (StackBlitz) (bolt-new) - URL: https://bolt.new - Category: AI app builders - Cost: mixed — Free 300K tokens/day, 1M/mo · Pro $25/mo (10M tokens, rollover) · Teams $30/member/mo - What it is: Runs a real Node toolchain inside the browser via StackBlitz WebContainers, so npm install, dev server and terminal all work client-side. Generates Vite, React and Next projects, deploys to Netlify or Vercel, and exports to GitHub or ZIP. A May 2026 Microsoft partnership added Azure deploy and Microsoft 365 integration. - Why builders pick it: The closest thing to a real dev environment in a browser tab — you watch and edit the file tree while the agent works. Pick it over Lovable when you want framework freedom and terminal access rather than a guided rail. - Trap: Token-metered, and failed builds or error loops still burn tokens. The free tier's 300K daily ceiling is consumed by one meaningful feature. WebContainers cannot run native binaries or Python, so some backends are simply off the table. - Wiring: Prefix any GitHub repo URL with bolt.new to import it directly. - Full dossier: /api/public/tools/bolt-new ## Google Firebase Studio (google-firebase-studio) - URL: https://firebase.studio - Category: AI app builders - Cost: free — Free · 3 workspaces (10 with Google Developer Program, 30 Premium) · Blaze billing for App Hosting - What it is: Browser IDE built on Code OSS with an App Prototyping agent that turns a prompt into a Next.js or React app wired to Firebase. Supports Flutter and React Native workspaces plus full Git access to the generated code. Google announced its sunset on 19 March 2026. - Why builders pick it: Was the cheapest way to get a Gemini-built app sitting directly on Firestore and Firebase Auth with no credit meter anywhere. Only relevant now for finishing and migrating workspaces you already have. - Trap: Shutting down. New workspaces and signups were disabled 22 June 2026, and the service shuts off 22 March 2027 with remaining data deleted. Google directs users to AI Studio or Antigravity; Firestore and Auth are unaffected. - Full dossier: /api/public/tools/google-firebase-studio ## a0.dev (a0-dev) - URL: https://a0.dev - Category: AI app builders - Cost: mixed — Free (limited messages, 1 project) · Pro $20/mo (100 messages/day) · $50 / $100 / $200 and up - What it is: Generates real React Native (Expo) projects — actual component files and navigation stacks, not a webview wrapper — with Convex or Supabase for data plus built-in AI inference and image-generation APIs. It runs the build, creates your App Store Connect listing, and uploads it for you. - Why builders pick it: The shortest distance from prompt to an app sitting in review on both stores, because it owns the build and submission step that normally eats a week. Source export unlocks at Pro. - Trap: The free plan caps you at one project and cannot export code — you need Pro to get the source out. Message caps, not compute, are the binding constraint on real work. - Wiring: Apple Developer Program ($99/yr) and Google Play ($25 one-time) accounts are still required. - Full dossier: /api/public/tools/a0-dev ## Quick read - Free with no card: Google Firebase Studio. ## Rules 1. Prefer the free tier when no budget was stated, and say what the ceiling is. 2. Read the full dossier before integrating. 3. Fetch /api/public/models before writing any AI model ID.
Agents can fetch the same thing: GET /api/public/compare?slugs=bolt-new,google-firebase-studio,a0-dev