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Pythagora

YC-backed open-source AI developer that builds complete apps through conversation — powered by the popular GPT Pilot project.

Type
App builder
Interface
IDE extension / Web
Open source
Yes (GPT Pilot)
Model choice
Multiple
Backed by
Y Combinator (W24)
Pricing
Freemium · from $49/mo
Official site
Visit →

What is Pythagora?

Pythagora's GPT Pilot is one of the most-starred open-source AI developer projects: it interviews you about your app idea, writes specs, codes iteratively, and asks you to test along the way — automating the repetitive loops of real software development.

Key features

01

Spec-driven building

Specs first, then code — like a real dev process.

02

Open source core

GPT Pilot is free to run and extend.

03

Human-in-the-loop

It asks you to test and confirm as it builds.

Pros and cons

Pros

  • Open-source full-app builder
  • YC-backed with a real community
  • Methodical, spec-first approach

Cons

  • Slower than one-shot generators
  • Needs your feedback to progress
  • Best for well-understood app ideas

Who is it for?

Builders who want an open-source AI partner for constructing complete applications step by step.

FAQ

What is GPT Pilot?
Pythagora's open-source project — an AI developer that builds apps conversationally.
Is it really YC-backed?
Yes — Pythagora is a Y Combinator W24 company.
Is it free?
The open-source core is free; check the site for hosted options.

Try Pythagora

Pricing and features change fast — check the official site for the latest.

Visit official site →

Last updated: October 2026 · Compare all agents