A bolt.new alternative where the AI ships structurally consistent business apps
bolt.new gives the AI full control of the filesystem and terminal to generate and run full-stack apps in the browser (you can download the code, sync to GitHub, or self-host via bolt.diy). d-bye has the AI draft a validated design spec instead of raw code, and passes type checks and a compile check before generating the DB, back end, and screens — consistently.
Where bolt.new starts to hurt
The AI writes raw code, so it drifts as the app grows
bolt.new has an agent write and run files directly. Prototyping is fast, but nothing programmatically guarantees the result type-checks, compiles, or stays consistent across the stack. The larger the app, the more you risk the broken/messy/self-contradicting output AI is prone to.
The source of truth lives in the code
In bolt.new, the evolving code is effectively the source of truth. That’s fast because design and implementation are one, but there’s no mechanism to keep intent explicit and regenerate consistently across the stack.
Token pricing scales with project size
Free (1M tokens/month, 300K/day) / Pro $25 (10M) / Teams $30/member / Enterprise. The bigger the project, the more tokens each message uses, so cost tracks size.
How d-bye differs — a spec as the source of truth, generated with validation
d-bye treats the design spec as the single source of truth: you design screens, DB, flows, and permissions. The AI drafts the spec, not raw code, then passes validation and generation gates. Generation is one-way (no reverse sync), so it’s predictable.
- ✓Stack: React/TypeScript front end, backend (multi-language), database schema (DDL). See supported languages & databases
- ✓The AI drafts a spec, not raw code → type checks and a compile check catch structural errors before export.
- ✓The spec is the single source of truth; one-way generation keeps front end, back end, and DDL consistent across regenerations.
- ✓Foreign keys, approval flows, and role-based permissions are modeled in the spec — for real business-app depth.
- ✓Export everything as a ZIP (like bolt, the code is yours — plus you keep the spec as an asset).
Where bolt.new lets the AI freely write and run a whole project, d-bye constrains the AI to a validated spec — so the generated business app stays consistent and compiles.
Comparison
| bolt.new | d-bye | |
|---|---|---|
| Approach | AI agent generates/runs raw code in the browser | AI drafts a validated spec, then code is generated |
| Quality gate | — (model output; you fix what breaks) | Type checks + compile check every generation |
| Source of truth | The evolving code | The spec; one-way generation (no reverse sync) |
| Cross-stack consistency | Depends on the model | Front end, back end, DDL derive from one spec |
| Business features (FK, approvals, roles) | Prompt for them each time | Modeled in the spec and generated |
| Code ownership / export | Yes (download / GitHub; self-host via bolt.diy) | Yes (full export as a ZIP + the spec as an asset) |
| Stack | Any (LLM-generated) | React/TS + backend (multi-language) + database schema (DDL) See supported languages & databases |
| Pricing | Token-based (Free 1M/mo, Pro $25/10M, Teams $30) | Sandbox ¥0 / Personal ¥2,980+ (full export) |
Pricing and specs change. Please check each vendor’s official site for the latest (checked 2026-07).
Which should you choose? (an honest split)
bolt.new fits when: you want to spin up a full-stack prototype from a prompt as fast as possible; you want to iterate in the browser; you want to try many LLMs and stacks freely.
d-bye fits when: you’re building a business app you’ll operate for the long haul, not just a prototype; you want AI output constrained by type and compile checks; you want a spec as the source of truth to stay consistent.
If unsure, try the free Sandbox first: open a template as a working preview and check the generated code (front end, back end, DDL).
FAQ
- Can bolt.new export code? How is d-bye different?
- Yes — bolt.new lets you download the code or sync to GitHub, and the open-source bolt.diy lets you self-host. d-bye also exports everything as a ZIP. The difference is method: bolt has the AI write raw code directly, while d-bye has the AI draft a validated spec and passes type/compile checks before generating.
- What about AI producing broken or inconsistent code?
- d-bye has the AI draft a spec rather than raw code, then runs type checks and a compile check as a gate. Because the spec is the single source of truth and generation is one-way, the front end, back end, and DB stay consistent across regenerations. See the Learn guide “an AI code generator that actually works”.
- Which is better for business apps (approvals, permissions, FKs)?
- d-bye models foreign keys, approval flows, and role-based permissions in the spec and generates the DDL, back end, and front end. For the consistency and maintainability of a long-lived business app, d-bye fits; for fast prototype iteration, bolt.new is strong.
- How much does it cost?
- d-bye is free (Sandbox) for design and preview; ZIP export and full-code view are on Personal (¥2,980/month, per seat) and up. bolt.new ranges from Free (1M tokens/month) to Pro $25 (10M), Teams $30/member, and Enterprise (token-based). Check official sites for the latest.
- Which teams is it for?
- Teams with engineers who want a long-lived business app generated as consistent, owned code from a validated spec — not just a quick prototype.
Next step
- →Try a template as a working preview for free → generate the code if you like it
- →Start from inventory / approvals / attendance / contact templates
- →Full download requires Personal or higher (design and preview are free, no credit card)