Describe it. Preview it. Own it.
Weldr turns your ideas into full-stack Next.js apps with a live preview you can interact with as you build. Unlike other AI tools, you get progressive ownership—start fully managed, then take control of any part, piece by piece.
- Live preview as you chat
- Your custom code, protected
- Export and deploy anywhere
Free to start. MIT-licensed core. No credit card required.
“I need a project tracker with tasks, team members, and a Kanban board”
A complete Next.js app with database, API, and UI—running live in your browser
db: managed ← Weldr handles api: extended ← Mix generated + custom billing: ejected ← You fully own
Why Weldr
AI speed without the tradeoffs
Other AI tools make you choose: fast generation OR control. Weldr gives you both.
Instant live preview
See your app running in real-time as you describe it. No waiting for deploys—changes appear instantly in a live browser preview.
Progressive ownership
Start fully managed, then take control piece by piece. Keep database and auth automated while you own the business logic that matters.
No lock-in, ever
Export your code anytime. Deploy anywhere. Your app is real Next.js + Postgres—not a proprietary runtime you can't escape.
How it works
From idea to running app in minutes
Describe what you want, see it come to life, and take ownership of the parts that matter to your business.
- 1
Describe
Tell Weldr what you're building in plain English. "I need a project tracker with tasks, team members, and a Kanban board."
- 2
Preview
Watch your app come to life in real-time. A fully functional Next.js app runs right in your browser as you chat.
- 3
Own
Take control of what matters. Keep the database and auth managed while you own your business logic with
@customblocks that survive every regeneration. - 4
Ship
Export to your own repo and deploy anywhere—Vercel, AWS, or your own servers. It's your code, forever.
// Weldr generates the CRUD
export async function createTask(input: CreateTaskInput) {
return db.insert(tasks).values(input);
}
// @custom — YOUR code, never overwritten
export async function createTaskWithReminder(input) {
const task = await createTask(input);
await notifyAssignee(task); // Your logic
return task;
}Weldr regenerates around your @custom blocks, never through them. Add business logic, integrations, or custom workflows—they're always preserved.
Smart scaffolding
Say it once, get the infrastructure
Mention 'Slack notifications' or 'Kanban board' and Weldr sets up the entire system—not just UI, but the backend, types, and config too.
Pattern recognition that actually works
Just describe what you need naturally. Say "notify the team on Slack when a task is overdue" and Weldr will:
- ✓Create the notification service with Slack webhook integration
- ✓Set up the scheduled job to check for overdue tasks
- ✓Document the
SLACK_WEBHOOK_URLyou'll need to configure - ✓Wire it all together with proper TypeScript types
Built-in patterns
Notifications
Slack, email, SMS
Auth
Auth0, Supabase, Clerk
Kanban
Task boards, pipelines
More capabilities coming soon. Extensible architecture lets teams build custom capabilities for domain-specific patterns.
What you actually get
Real results, not marketing promises.
Time to working app
Minutes
Go from idea to a running, interactive app you can share—not wireframes or mockups.
Your code protected
100%
Your custom code is never overwritten. Weldr regenerates around your changes, not through them.
Lock-in risk
Zero
Export anytime. Standard Next.js, Postgres, and TypeScript—no proprietary runtime.
Who it's for
Built for people who ship
Whether you're a solo founder or a dev team, Weldr gets you to launch faster—without the lock-in.
Technical founders
Ship your MVP in days, not months. Keep full control of the codebase as your product and team grow.
Read the founder guideDevelopers
Stop writing CRUD and boilerplate. Focus on the business logic that actually matters while Weldr handles the rest.
See the developer workflowAgencies
Deliver client projects faster and hand off clean, maintainable codebases they can actually own.
Learn about handoffsFAQ
Questions teams ask us
Is this another no-code tool?
No. Weldr generates real code—Next.js, TypeScript, Postgres. You get a standard codebase you can open in VS Code, commit to Git, and deploy anywhere.
What happens when I need custom logic?
That's where progressive ownership shines. Mark any part of your app as "extended" to add custom code that Weldr will preserve across regenerations. Or "eject" it entirely to own it yourself.
How is this different from Bolt, Lovable, or v0?
Those tools generate code but lock you into their platforms. Weldr gives you progressive ownership—start managed, take control incrementally, and export everything. No vendor lock-in.
Can I self-host?
Yes. The core is MIT-licensed and runs anywhere. The hosted platform adds collaboration features and higher limits when you need them.
Ready to build something?
Describe your app and see it come to life in minutes. Free to start, no credit card required.