Bolt generates and runs full-stack code in the browser from natural language; CleenUI is a licensed .NET + React codebase with 524 pre-built endpoints and 14 production modules.
Bolt (by StackBlitz) generates and runs code entirely in the browser — React, Vue, Node.js — from a natural-language prompt. The browser-based runtime makes it fast to start and easy to share. The limitation is the same as other AI code generators: every project starts from zero. Bolt can scaffold a CRUD interface, but the underlying data model, the auth layer, the multi-tenant boundaries, and the background processing are yours to add. CleenUI ships that foundation: 14 production modules, 524 API endpoints across a .NET 8 backend, 300+ database tables and 700+ stored procedures in Azure SQL, Azure Functions and WebJobs for background processing. The choice isn't Bolt vs. CleenUI — many teams use Bolt or similar tools to prototype UI ideas and then implement them on a CleenUI foundation.
| Category | CleenUI | Bolt |
|---|---|---|
| Runtime | .NET 8 + React 18 (separate API + SPA, server-deployed) | Browser-based WebContainers (Node.js, React, Vue — client-side execution) |
| Backend | ASP.NET Core 8 Web API — 524 documented endpoints across 25 functional groupings | Node.js or lightweight server — AI-generated per project; no pre-built API surface |
| Database | Azure SQL — 300+ tables, 700+ stored procedures, Dapper + ADO.NET (no ORM) | None included in the browser runtime — external DB wired manually |
| Modules included | 14 vertical-slice production modules (M01–M14) | None pre-built — generated per prompt |
| Auth | Auth0 + JWT + RBAC + ABAC + row-level isolation + API-key auth (M01) | None pre-built — Bolt can scaffold auth on request; correctness is your responsibility |
| Multi-tenant isolation | Built-in account / company hierarchy with row-level data scoping | Not included |
| Background processing | 12-project .NET solution: 3 Azure Functions + 2 WebJobs + 6 shared libraries | None included |
| Distribution | Custom-scoped engagement (one-time license, architect-led) | SaaS — free tier + paid plans; projects run in StackBlitz or export to deploy elsewhere |
These capabilities are pre-built in CleenUI. Bolt has no equivalent — you'd build them from scratch or wire a third-party integration.
ASP.NET Core 8 Web API — a typed, compiled, server-deployed backend with 524 documented endpoints. Bolt generates Node.js or lightweight server code in a browser runtime; there's no .NET path.
Row-level data scoping across 300+ tables — account-scoped at the data layer. Bolt has no data isolation model; you'd add it manually to every generated query.
A production-tested Azure SQL data layer with named stored procedures — explicit, auditable, DBA-readable. Bolt generates ad-hoc queries or ORM calls with no stored-procedure layer.
3 Azure Functions + 2 WebJobs with domain-specific workers (translation, media safety, video encoding, thumbnails). Bolt ships no async processing layer.
Role-based access control enforced at the API layer on every endpoint. Bolt can scaffold auth on request; a production RBAC system covering 524 endpoints is not something it generates.
M07 Messaging: full real-time hub — conversations, presence, reactions, read receipts, media. Bolt has no real-time layer.
Pick Bolt when you're prototyping, demoing, or exploring a UI idea and need to share a live preview quickly. Its browser-based runtime is ideal for short-lived demos and rapid iteration before architecture decisions are locked.
Pick CleenUI when the prototype has to become a production application. The 524 pre-built API endpoints, multi-tenant data isolation, and 14 vertical-slice modules are the architecture that a Bolt-generated prototype would need to rebuild from scratch.