Webase

Describe an app. Webase builds it, backend included.

Webase is an open-source AI app builder that runs on your own Claude or OpenAI key, so you pay your AI provider directly. Every app it builds comes with its own database, user logins and image uploads, and can use AI with your key.

Free with your own Claude or OpenAI key.

Webase is open source under the MIT license. The code is on GitHub.

The Webase editor. On the left, a chat of three changes to the app, each saved as a version. On the right, a live preview of GreenCrew, a landscaping job tracker Webase generated, showing this week’s jobs with counts by status.

This sentence is the whole brief for the app above:

A job tracker for a small landscaping company. Track jobs with a customer, address, scheduled date and status, and show what’s scheduled this week. Crew members log in to see their jobs.

Webase planned the features, wrote 21 source files in about three and a half minutes, and set up the data. The app also got its own backend, with nothing else to install:

Data
Collections designed for the app, here jobs, crew members and work logs.
GET /api/v1/apps/greencrew-job-tracker/data/jobs
Logins
Sign-up, login and password reset, and each user gets their own records.
POST /api/v1/apps/greencrew-job-tracker/auth/login
Images
Image uploads your app can store and serve.
POST /api/v1/apps/greencrew-job-tracker/images/upload
AI
Add a key to an app, and its features can call Claude or GPT.
POST /api/v1/apps/greencrew-job-tracker/ai/complete
The Data tab in the Webase editor, showing ten job records with customer, address, scheduled date, status and notes.
The same app’s jobs in the Data tab, with sample records Webase generated. The chat stays beside every tab.

How a build works

  1. Plan

    Webase turns your description into a list of features, each with a way to tell when it’s done, and suggests what to add next.

  2. Build

    It writes a React app and shows it in a live preview. Change it by chatting, or edit the code yourself. Every change is a version you can go back to.

  3. Test

    When you ask, an AI check scores the app against what you asked for and fixes what falls short.

  4. Publish

    Your changes stay private until you publish. Then share the app’s link, download its code, or push every version to GitHub.

Webase is free, and you pay your AI provider directly

What a build costs
In our test builds, a small notes app cost about 20 cents in API fees, and the job tracker above about 40.
Your key
It’s encrypted when you save it, used only for your own requests, and only its last four characters are shown again. Set a spending limit with your provider to cap what you can spend.
Building from other AI tools
ChatGPT, Claude or a coding agent can create and edit your apps over MCP.
Running it yourself
Webase is a Rails app. It needs Ruby, Node, PostgreSQL and MongoDB, plus a Claude or OpenAI key. The code is on GitHub.