Describe your idea. Agents build it, put it online, watch how people use it, and keep improving it. You run the company.
You do not set up a server, a database, sign-in, or hosting. Every app has them from the first build.
Describe the app in Build, or build it in Claude Code or Cursor. Both make a Pylon project that you own.
Your idea
Build a booking app
for my fitness studio.
Let members browse classes, book a spot, and manage their passes.
Demo: a request becomes a fitness studio app with a class schedule, online bookings, and member passes.
Make time to move. Book a class that fits your day.
Morning flow
Yoga · 45 min
7:00 AM · 6 spots left
Reformer Pilates
Pilates · 50 min
9:30 AM · 3 spots left
Strength essentials
Strength · 45 min
12:00 PM · 8 spots left
Your membership
8 classes remaining
Describe your app in Build. Preview it, make changes, and publish from your browser.
Explore BuildStack0 keeps working after launch. Cloud runs the app, Analytics and Feedback show how people use it, and agents act on what they find.
Cloud hosts your app with its database, secure connections, and global delivery. Your project becomes a live product that customers can use.
Explore Cloudclimbday
https://climbday.stack0.app
Resources
Runtime
2 vCPU · 4 GB · fra1
Postgres
16 GB · nightly backup
Storage
1.2 GB · edge cached
Auth
312 users · OAuth
Jobs
3 scheduled
Traffic · 24h
12.4k requests · 0.02% errors
Deployments
Logs · production
07:02:11GET /book 200 · 41ms
07:02:13POST /waivers 201 · 88ms
07:02:19job sendReceipt · queued
edge · 330 cities
p50 38msThe Stack0 team builds and runs its own products on Stack0. One person built each of these.
An AI agent for car dealerships. It texts every seller lead within 5 seconds, calls them, and books the appraisal.
The website of a recovery clinic with three locations in Texas: 26 pages, booking by location, and a contact form that sends leads to the clinic's CRM.
Members rate their recovery after each session, and staff see who needs attention. Sign-in by text code, wearable sync, and SMS reminders. It installs on a phone's home screen.
Start with the idea you have. Build the interface, connect your data, and add the features your users need.
Business sites, portfolios, and landing pages.
Approval flows, inventory, and team operations.
Reports, live metrics, and data views.
Accounts, subscriptions, and shared workspaces.
Platformers, puzzles, and arcade games for the web.
Browser worlds, simulations, and interactive scenes.
AI-generated examples of what you can build.
Every app is a Pylon project, and Pylon is open source. Edit the project in your own editor or coding agent, export it, or host it yourself.
Add Stack0 APIs for email, files, video, and extraction with one API key. Connect Claude Code, Cursor, or another coding agent to Stack0 through MCP.
import { Stack0 } from "@stack0/sdk" const stack0 = new Stack0({ apiKey: process.env.STACK0_API_KEY }) await stack0.mail.send({ to, subject: "Welcome!", html })await stack0.screenshots.captureAndWait({ url, format: "png" })await stack0.extraction.extractAndWait({ url, schema: Listing })Build, Cloud, Agents, Analytics, Feedback, and the APIs share one subscription. Your total depends on the resources your app and agents use.
Access to every product. No per-seat fees.
Applied across products before additional usage is billed.
Compute, storage, model calls, events, and API requests are billed at their listed rates.
Example monthly bill
$30 of usage − $10 credit + $20 subscription = $40 total.
An illustration of billing, not an estimate for your app.
Stack0 is a set of products to build and run an app. Build makes the app from a description. Cloud hosts it. Analytics and Feedback show how people use it. Agents do work for you. One account and one subscription cover all of them.
No. Describe the app in Build, and describe each change you want. If you write code, the project is yours to edit in any editor.
Yes. Build with your coding agent in a Pylon project and deploy it to Stack0 Cloud with the pylon CLI. Connect the agent to the Stack0 MCP server at cloud.stack0.dev/mcp to use Stack0 products from the agent.
Yes. Every app is a Pylon project, and Pylon is open source. You can export the project and host it yourself.
On Stack0 Cloud. Each app has its own runtime and database (SQLite or Postgres), file storage, HTTPS, and your own domain if you connect one.
$20 a month for every product, with $10 of usage included. Usage after the credit is billed at the listed rates. There are no per-seat fees.
Agents work in your tools. They answer support messages, chase invoices, fill schedules, and draft replies. Work that needs your approval waits until you approve it.
Create your account to build, deploy, and improve your app with Stack0.
Prefer to host it yourself? Explore Pylon.