Think through the work.
Then build it.
Useful engineering decisions deserve clear inputs. Compare a budget, specify a product or plan a move before starting generation. These tools run locally without model calls or studio usage.
AI builder cost calculator
Compare published annual plan and source-access costs, add your own usage and hosting budget, and inspect every assumption before choosing an AI builder.
Free full-stack prompt architect
Turn an app idea into an editable multi-page brief with typed collections, real interactions, account boundaries and integration checks without an AI request.
AI builder migration checker
Plan a move from Base44, Emergent, Lovable, Bolt.new, Replit or v0. Separate transferable source from records, identities, secrets and hosted services.
Preparation stays yours.
You can copy a brief, inspect every cost assumption, or prepare a named draft. Opening a tool does not submit an AI build. Source access remains $4.99 per project or included through an applicable subscription; hosted services and generation are separate.
Check the architecture. Compare the tradeoffs.
Follow the data model, account boundary and source handoff before choosing a builder.
Compare builders
Plan a full-stack app
Review the evidence
- Full-stack builder buyer’s guide
- Four full-stack workflows compared
- Plan data, sign-in and checkout
- Machine-readable evidence and methodology
- Remixable app blueprints
- Direct answers to builder questions
- Free planning and migration tools
- 108 full-stack engineering prompts
- Public SDK documentation
- Recorded checks and open evaluation protocol
- RSS updates for guides and comparisons