A small, opinionated software studio
Buyonce.ai makes focused, local-first tools with care. Pay once, keep your software, and keep your files.
In development
Write it yourself. Get better help.
A local-first writing workspace where AI helps you clarify, critique, and revise without taking over your work.
Local by defaultYour writing stays on your Mac.
You remain the authorAI helps you think, not generate around you.
Use your existing AI accessConnect your ChatGPT or Codex account without a separate API key.
The Buyonce promise
AI made software cheaper to create. We want that abundance to reach the people buying it—not just the companies selling it.
One small payment instead of another subscription quietly draining your account.
Your work stays accessible on your machine, in formats that remain useful to you.
AI can question, critique, and suggest. You decide what enters your work.
Studio note
Buyonce.ai is a small studio building tools we wish existed in the way we imagine them. They are biased and opinionated on purpose. If something important is missing, tell us. We will seriously consider it.
The first tool