Simple pricing,
serious power.
Start free, upgrade when you're ready. No surprises, no hidden fees — just the tools you need to go from idea to prototype.
Compare plans
A detailed look at what each tier includes.
| Feature | Free | ProPopular | Max |
|---|---|---|---|
| Concepts & Pipeline | |||
| Active concepts | 3 | Unlimited | Unlimited |
| Pipeline stages (Idea → PRD → Prototype) | |||
| AI Generation | |||
| AI generations / month | 5 | 60 standard + 10 Opus | 200 standard + 50 Opus |
| Model selection | Gemini Flash | All 6 models | All 6 models |
| AI critique & PRD generation | |||
| Prototype code scaffolding | |||
| Integrations & Export | |||
| External links per concept | 1 | Unlimited | Unlimited |
| "Build with..." tools (v0, Lovable, etc.) | |||
| Export to PDF | |||
| Support & Extras | |||
| Real-time cloud sync | |||
| Dark/light mode | |||
| Search (title, tags, summary) | |||
Concepts & Pipeline
Active concepts
Free
3Pro
UnlimitedMax
UnlimitedPipeline stages (Idea → PRD → Prototype)
Free
Pro
Max
AI Generation
AI generations / month
Free
5Pro
60 standard + 10 OpusMax
200 standard + 50 OpusModel selection
Free
Gemini FlashPro
All 6 modelsMax
All 6 modelsAI critique & PRD generation
Free
Pro
Max
Prototype code scaffolding
Free
Pro
Max
Integrations & Export
External links per concept
Free
1Pro
UnlimitedMax
Unlimited"Build with..." tools (v0, Lovable, etc.)
Free
Pro
Max
Export to PDF
Free
Pro
Max
Support & Extras
Real-time cloud sync
Free
Pro
Max
Dark/light mode
Free
Pro
Max
Search (title, tags, summary)
Free
Pro
Max
No lock-in
Cancel anytime. Downgrade to Free and keep all your concepts — you just lose AI generation until you re-subscribe.
Prorated billing
Upgrade mid-cycle and only pay the difference. Downgrade and keep access through your current billing period.
Free tier forever
The Free plan isn't a trial — it's a permanent tier with real functionality. Capture ideas, generate critiques, and sync to the cloud.
Common questions
Everything you need to know about Concept Sandbox pricing.
Free users get Gemini Flash for quick generations. Pro and Max users unlock the full model roster — Anthropic Opus 4.6, Sonnet 4.6, OpenAI Codex 5.3/5.4, and Google Gemini Pro. Each model is optimized for different tasks: Opus for deep PRDs, Codex for code scaffolding, Gemini Pro for general tasks.
Pro and Max users can launch into external prototyping tools — v0, Lovable, Bolt.new, or Replit — with concept context pre-loaded. Your PRD, user stories, and requirements get passed directly to the tool. Build externally, then link the result back to your Concept Sandbox.
Absolutely. Upgrades take effect immediately with prorated billing — you only pay the difference for the remainder of your billing period. Downgrades take effect at the end of your current period so you keep access until then.
You'll see a friendly upgrade prompt with a one-click CTA. Your concepts, PRDs, and all data remain fully accessible — only new AI generations pause until your limit resets at the start of the next period.
Your data is stored securely on Supabase with row-level security, meaning only you can access your concepts. All connections are encrypted via TLS. We never train AI models on your data. When you use AI features, your concept content is processed by our AI providers (Anthropic, OpenAI, Google) under strict data processing agreements. External 'Build with' tool launches are always user-initiated.
Not yet, but it's on the roadmap. When we launch annual plans, you'll get two months free. Subscribe monthly now and you'll be automatically offered the annual discount when available.