Start anywhere
Describe it, import it, or open an existing project.
Begin from a prompt, a local folder, or a supported GitHub repository. Every project opens as a real workspace with files, preview, and history.
// Builder
Build software with AI. Keep control of the result.
Builder is AlgoArena's browser workspace for making apps, tools, and games with AI while keeping the files, preview, history, and final decisions visible.
Start from a prompt, local project, or supported GitHub repository. Signed-in builders can create and keep projects in the browser.
https://algoarena.net/builder
Quietlist
Builder chat
Build a calm weekly planning app for small teams. Keep it keyboard-first.
AlgoArena
Built the responsive board, command palette, and local task persistence. The preview is ready to inspect.
Edited 3 files+286-18
Responsive planning board
Keyboard command palette
Local task persistence
Live Preview
Weekly planning workspace
Monday, July 29
Good morning, Maya.
The week is clear. Pick the next meaningful thing.
Today
5 tasks
In progress
3 tasks
Done
10 tasks
Today
Ship the onboarding empty stateM
Review keyboard navigationS
Polish mobile board spacingN
A complete build loop
The AI can move quickly. You can still see what happened.
Describe
Set the outcome and constraints.
Inspect
Read the files, diff, preview, and console.
Rewind
Restore a project version when needed.
Keep
Export or publish the finished project.
What Builder gives you
One workspace from first instruction to owned project.
Stay in control
Move between conversation, code, preview, and console.
Use the Editor for a focused build loop or open Agents for larger work. Inspect the actual files and change them by hand whenever you want.
Own the result
Version, export, publish, and keep what you made.
Restore earlier versions, download the project, publish it to Showcase, or continue the work in your own tools.
Enter the workspace