Which AI app builders have a real backend?
VULK, Lovable, Bolt, Replit, Base44 and v0 all offer ways to build applications with persistent data and server-side behavior. The useful comparison is how each handles your data, authorization, deployment and exit path. An attractive dashboard alone cannot answer those questions.
Disclosure: VULK is our product. This comparison reviews official documentation and public prices on October 14, 2026. It is not a controlled benchmark of applications generated by all six vendors. The acceptance checks below are our engineering criteria.
Six options and their documented architecture
| Tool | Backend approach | When to evaluate it |
|---|---|---|
| VULK | Generated PostgreSQL schema, REST API and authentication through the VULK API engine | A CRM or SaaS with an integrated backend, plus web, Flutter or 3D requirements |
| Lovable | Lovable Cloud integrates database, authentication, storage and functions | Managed application infrastructure in the builder |
| Bolt | Bolt database, with Supabase connection and migration options | An integrated build workflow with a database provider choice |
| Replit | Managed SQL database alongside application code | An application whose server logic needs direct development |
| Base44 | Integrated backend; GitHub synchronization and local development | A managed app with a workflow between the builder and a repository |
| v0 | Next.js server logic and database integrations | A Next.js application using the Vercel ecosystem |
Lovable and Bolt should no longer be described as requiring a separate Supabase setup for every app. GitHub synchronization, database export and independently hosting the entire backend are separate capabilities; verify the exact migration path you need.
Where VULK fits
VULK combines generated application code with an integrated PostgreSQL backend. In the editor, you can inspect tables, run SQL, test API endpoints and export table data. Source export and the database schema help you review the application and prepare a handover. Moving hosting also requires the data, authentication configuration and backend connection settings.
For a CRM, start with companies, contacts, deals, activities and tasks, then specify who may read or change each record. For SaaS, define workspaces, memberships and subscription ownership before generating the dashboard. Our CRM implementation guide and SaaS starter guide explain these decisions. VULK also supports Flutter applications and 3D experiences when the product requires them; a CRM does not need those features to be useful.
Monthly prices checked on October 14, 2026
These are public USD monthly subscription prices, not annual equivalents or total operating costs. Currency, taxes, promotions and usage charges can differ by region and account. Follow each source for its current conditions.
| Tool | Paid entry or relevant plan | Official pricing |
|---|---|---|
| VULK | Builder: $19.99/month; no free plan | VULK plans |
| Lovable | Pro: $25/month | Lovable plans |
| Bolt | Pro: $25/month | Bolt plans |
| Replit | Core: $20/month | Replit plans |
| Base44 | Starter: $20/month; Builder: $50/month | Base44 plans |
| v0 | Plus: advertised $30/user/month | v0 plans |
Base44 documents GitHub two-way sync on Builder and above. Include the plan needed for your workflow in the comparison. Budget separately for generation, hosting, database usage, storage and payment processing where applicable.
Five checks before choosing a CRM or SaaS builder
- Persistence: create a record, reload, sign out and sign in again. Confirm it in the database and after redeployment.
- Workspace isolation: create two workspaces and ordinary accounts. Try reading, editing and deleting the other workspace's record by ID. The server must refuse it even if the UI hides that record.
- Membership changes: revoke access while a session is open. Repeat the request with the existing session. An old role in a token must not preserve removed access.
- Subscriptions: use Stripe test mode. Verify a signed webhook, reject a modified signature and replay the same event. Confirm that the subscription belongs to the right workspace and is not duplicated.
- Handover: export the source, build it in a clean environment and restore sample data. Record which services still need configuring outside the builder.
FAQ
Does an integrated database make an app production-ready?
It provides infrastructure. The application still needs correct permissions, validation, recovery behavior and tests for its own user journeys. Apply the same checks to VULK and every alternative.
Which should I choose for a SaaS MVP?
Shortlist by your required stack and operating model, then build the same small workflow in each candidate. Compare the working result, corrections required and cost of running it. A product-wide ranking cannot substitute for that evidence.
Why is Databutton no longer in the six?
On the review date, databutton.com redirected to Riff, positioned around agents for industrial operations. This revision replaces its previous app-builder entry with v0 and corrects the earlier backend descriptions.
