Comparison · Chromoly vs Bolt.new
Bolt.new is one of the most impressive demos in software: describe an app, watch a full-stack codebase materialize in your browser. For prototypes and dev-adjacent builders, it's excellent. The question that matters for business software is what happens after the demo - and that's where the two products diverge completely.
| Chromoly | Bolt | |
|---|---|---|
| What the AI produces | A readable system definition (AppSpec) - compiled deterministically | A full codebase, written token by token |
| Consistency | Same spec → same system, every time | Every generation is a fresh improvisation |
| Who reviews the output | You - the spec is plain-language readable | Effectively no one - that's the product's premise |
| Security | Property of the compiler: row-level isolation, audit log, always | Depends on what the model generated |
| Changes | Spec diff + blast-radius preview + approval + rollback | More AI generation on top of prior generation |
| Maintenance | Platform-owned for the lifetime of the account | Yours - hosting, dependencies, patches, fixes |
| Pricing model | Flat tiers from $59/mo; ~60 credits per generation, 0.5 per edit | Token-based - Pro from $25/mo with 10M tokens; complex apps burn more |
| Built for | Internal tools, portals, and AI automations a business runs on | Prototypes and products for dev-adjacent builders |
| AI-agent access | MCP endpoint on every build, scoped tokens, kill switch | Not a native concept for the built app |
| Data residency | EU by default (Ireland), GDPR-ready, signable DPA | Your deployment choice - and your responsibility |
Bolt bets that AI writing code is good enough - and for prototypes, it clearly is. But if the AI's output is executable code, the AI's mistakes are executable too. The 2025 record made this concrete: generated apps shipping without proper access controls, an AI agent deleting a production database mid-session. Not because the models are bad - because the architecture puts improvisation in the production path.
Chromoly constrains the AI to producing a spec, and lets boring, deterministic machinery do the rest - the full pipeline is documented openly. For a prototype this would be overkill. For the system that runs your invoicing, it's the whole point.
For business systems that need to run for years - yes, by design. Bolt is a genuinely impressive AI coding tool: describe an app, watch it write a full-stack codebase in the browser. But the output is code nobody on your team will review, and you own its maintenance. Chromoly generates a structured system definition instead, compiles it deterministically, and the platform owns the runtime and maintenance.
Bolt's AI writes application code - every generation is an improvisation, and complex apps burn through tokens as the AI iterates on its own output. Chromoly's AI produces an AppSpec - a readable definition of entities, workflows, and screens - and a deterministic compiler builds the system from it. Same spec, same system, every time. Security and isolation are properties of the compiler, not of whatever the model generated that day.
Bolt runs on tokens: free tier around 1M tokens/month, Pro from $25/month with 10M tokens - and complex apps consume tokens fast since every change means more generation. Chromoly meters work, not tokens: ~60 credits to generate a system, 0.5 per chat edit, on flat tiers from $59/month. Predictability is the point.
Replit's AI agent builds and deploys full apps and is popular for prototypes. The same architecture caveat applies - AI-written code you don't review - and the risks aren't theoretical: in a widely reported 2025 incident, an AI coding agent deleted a production database mid-session. Chromoly's answer is structural: no delete tools over MCP, human approval gates, versioned rollback, and a deterministic engine between AI and production.
You do. Bolt hands you a codebase (with export to GitHub) - hosting, dependencies, security patches, and every future change are yours, which usually means hiring a developer eventually. Chromoly maintains the platform and every generated system on it for the lifetime of the account.
Describe what you need in plain language. Chromoly generates a working preview in your browser - free tier forever, 150 credits/month, no credit card.
Start free →EU-hosted · GDPR-ready · maintained for life