Playground Childcare software with a warm, direct hero. Visit ↗
BYOB New inbox in every project
App Builder
an app builder should take you from a rough idea to something you can click and test. BYOB reads a plain-language description and produces a real web application, then keeps every screen editable so the project can mature past the first prototype.
Runs on the stack you trust
Prompt to product
From one-line brief to finished app.
Compare the one-line brief with what BYOB ships. Real layout, data, and deploy status, editable from the same workspace.
TD
Team Tasks
Shared task tracking
Today4
Done11
Streak6d
Open live app ↗
Drag the handle. Or focus it and use the arrow keys.
Get inspired
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Real sites that do it well. Build something like this with BYOB.
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Evernote Notes app with a memorable second-brain pitch. Visit ↗
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Cofounder Agent startup with a playful, clear page. Visit ↗
Startup Landing-page builder with strong templates. Visit ↗
Fresh from the community
See what builders ship, or start from an example.
Live workspace
Code, chat, and preview in one place.
The workspace is built for repeated product work, not disposable demos. Every generated file stays inspectable, every change is visible, and every follow-up can target the exact part of the app you care about.
01 · EDITOR
Generated code, ready to edit.
Every file BYOB writes stays visible and editable. Follow-ups target the exact lines you care about instead of regenerating from scratch.
- Added lines highlighted the moment they land
Code
Act mode TodoPage.svelte
schema.ts
1
<script lang='ts'>2
type Task = { id: string; title: string; done: boolean
}3
let tasks = $state<Task[]>([])4
5
function toggleTask(id: string) {6
task.done = !task.done // just added by BYOB7
}8
</script> main · 0 problems Preview ready
02 · AI COMMAND
Plan, build, and refine in one chat.
Describe the outcome once. BYOB turns it into a build plan, implements it step by step, and keeps every change visible while you iterate.
- Build plan with live progress you can inspect
B BYOB AI
Chat Act
Your prompt
“Build a todo app for beginners”
Build plan
80%- Task list UI + empty state
- Add + toggle actions
- Progress summary…
Add due dates and filter by done…
03 · LIVE PREVIEW
See every change the second it lands.
The preview updates as BYOB works, with deploy status attached, so the path from edit to production stays inspectable.
- Real app state, not a static mockup
Live preview
/TD
Team Tasks
Shared task tracking
Progress 2 of 3 done
- Wireframe landing page
- Task list component
- Responsive polish + QA
Ask BYOB to refine
Deployed · SvelteKit · SSL on
Prompt to app
From first prompt to a workspace you can ship.
Start conversationally, approve the shape, let Tool Mode implement, then refine and deploy from the same workspace.
- 01 Describe the product Start with the outcome, audience, and any constraints. BYOB turns the idea into a practical build plan.
- 02 Shape the UX Review the proposed flows, screens, data needs, and visual direction before code starts moving.
- 03 Generate the app Tool Mode writes SvelteKit code, connects integrations, and keeps each change visible in preview.
- 04 Test and refine Ask for edits, roll back when needed, run checks, and keep the project editable instead of disposable.
- 05 Deploy Ship the finished app, connect domains, and keep iterating from the same workspace.
Agent and backend
Code with your agent, ship with a real backend.
Connect Codex, Claude Code, or Antigravity to your project, then store data and ship to production without leaving the workspace.
- Approve project access from BYOB
- Installs the byob command
- Preview, deploy, git diff, DNS, credits, and code tools
npmnpx -y byob-cli codex installApprove only the projects your agent can touch, then read context, edit files, inspect diffs, test previews, and roll back from your terminal.
- 1
- prompt to start
- 3
- live panes
- 24/7
- edge preview
Loved by builders
Rated 4.9/5 by developers and founders using BYOB to move from idea to shipped product.
Built for shipping
The parts that usually slow you down are already here.
BYOB handles product planning, implementation, preview, testing, database work, and deployment from one focused interface, with coding-agent access and production analytics when you want to keep working from your own terminal.
This part is hands-on. The cards drift until you touch them. Drag to rearrange, or press and hold one to feel it push back.
Agent integrations
Give Codex, Claude Code, or Antigravity scoped access through BYOB CLI or Agent MCP. Your agent reads context, edits code, tests previews, and deploys from your terminal.
Git history and diffs
Every change lands as a commit. Inspect history, compare diffs, and see exactly what changed since the last deploy.
Inbox in every project
Every project ships with an inbox. Collect messages, leads, and feedback from your app without wiring a third party.
Email sending built in
Send magic links, OTP codes, and transactional mail from your own sender address. Resend-backed, no SMTP setup.
Google and magic-link login
Offer Continue with Google plus passwordless email codes. Sessions and callbacks are handled.
Custom domains and SSL
Point your domain at BYOB with guided DNS checks. Certificates are automatic.
Visual editing
Click any element in the live preview and describe the change. Copy, spacing, color, behavior.
AI testing agent
Run full-site or feature checks and get implementation-level feedback you can apply in one step.
Version rollback
Step between saved states or redeploy a known commit when an experiment goes sideways.
One-click deploy
Builds publish to production hosting in one step. Deploys can auto-save the project state first.
Deployment analytics
Worker traffic, errors, CPU timing, subrequests, and custom-domain status from the workspace.
Supabase aware
Connect Supabase and BYOB reads schemas, drafts migrations, and generates types that match your app.
Team collaboration
Invite people in and keep sessions coordinated so work never overwrites work.
- Vision inputs
- Voice coding
- Project templates
- SEO-ready output
- Context tracking
- Model lock
Simple pricing
Start with credits, upgrade when usage is steady.
Pay as you go when you are exploring. Move to Pro or Max when BYOB becomes part of your regular build workflow.
Pay as you go
$0
$1 = 100 credits
Pro
$25
2,000+ credits/mo
Max
$79
8,000+ credits/mo
Live estimator
What will your app cost?
Try the cost calculator. Drag the pages slider, toggle the options, and watch the agency quote vs BYOB update instantly.
Open full cost calculator →Number of pages: 5
Traditional agency estimate
$5,750 upfront
Yearly maintenance
~$1,150 / year
BYOB estimate
~$45 in credits
BYOB builds the same site from one prompt and hosts it on the edge. Planning estimates, not quotes.
See BYOB plansView full pricing
Need white-label and SSO? Talk to us →
an app builder turns a description of what users should be able to do into a working web application. BYOB generates a project with screens, navigation, server logic and optional login and data storage, then lets you refine it by chatting, editing visually or writing code before you publish.
From a paragraph to a working screen
You do not need a specification document to start. A few sentences about who uses the app and what they do is enough for BYOB to propose screens, navigation and data flow. It generates the routes, writes the components and serves a live preview you can click through. Forms submit, lists fill from real queries and links resolve, so the first version is something you can test with users instead of a static mockup.
A real project under the preview
Everything in the preview is backed by ordinary and. That means the same app can be opened in the code editor, inspected file by file, and extended by a developer. You are not filling in a proprietary canvas that only the vendor's runtime understands. When a requirement falls outside what a prompt can express, you can drop into the generated files and write the missing piece directly, then return to conversational editing.
Grow past the first version
Prototypes become products when they gain accounts, storage and permissions. BYOB bundles those as first-class pieces rather than outside services: Better Auth for sign-in with magic links or Google, managed data stores or a connected data source project, file storage on R2 and transactional email. Add a dashboard, a settings page or role-based access by describing the change, and the generator writes the routes and queries that support it.
Choose how you edit
Different people prefer different controls. Product owners can describe changes in chat - rename a field, move a button, add a filter - and see the result in the preview. Designers can select an element and adjust layout, colour or spacing visually. Engineers can open the source and edit a query or component directly. All three paths touch the same project history, so a change made one way is visible and reversible from the others.
Ship it anywhere
When the app is ready, publish to the edge with a single click and attach a custom domain. If you would rather run it yourself, export the repository as a ZIP and host it on your own infrastructure. The and integration let external coding agents work on the same codebase, and a testing agent checks the app across screen sizes before launch. The point is that nothing about the build path traps your application inside BYOB.
FAQ
Frequently Asked Questions
Do I need to write code to build an app?
No. You can describe the application and refine it in chat or the visual editor. The generated code is available for developers who want to extend it.
What can the app store data in?
built-in data storage on is available by default, or you can connect an existing data source project and generate matching frontend code.
Can the app have user accounts?
Yes. Authentication with Better Auth supports magic-link and Google sign-in, and you can protect routes or add role-based access.
Can I export the code?
Yes. Every project exports as a standard repository, so you can host it elsewhere or hand it to a development team.
Does it work for mobile apps?
BYOB builds responsive web applications. They run in mobile browsers and can be installed as a PWA; native app-store packaging is not included.
Build the first version today.
Start with one clear prompt. BYOB will help turn it into a product you can inspect, edit, test, and ship.