Oneline
Oneline: software for one.
Core trick
Three candidate apps build in parallel sandboxes, are scored by Playwright functional tests, and the top one deploys with a QR code.
Description
Oneline: software for one. Describe the exact tool you need in one line, and get it running on your phone in under a minute, built for the single person asking instead of a market. A planner trims the request, three candidate tools build in parallel inside Gemini Managed Agents sandboxes, a three-layer judge scores each (functionality via Playwright inside the sandbox, UX clarity, design coherence), a deterministic selector picks the winner, and it deploys to Cloud Run with a QR code. Each losing candidate's mistakes become lessons that improve the next build. Not an app builder like Lovable or V0 which ship to a market; Oneline builds a disposable tool for the one person who asked, used, and throws it away.
README excerpt
# Oneline
> Software for one. Describe the exact tool you need and get it running on your phone in about two minutes. Built for the person asking, not a market.
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<a href="https://www.youtube.com/watch?v=Lm403MpBo_Y">
<img src="assets/dashboard.png" alt="The Oneline dashboard: three candidate tools build in parallel while the knowledge base grows" width="100%">
</a>
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<em>▶ Watch the one-minute demo</em>
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Oneline turns a one-line description of a tool into a working app on your phone. Each tool is generated by Gemini 3.5 Flash inside a Managed Agents sandbox, judged for quality, deployed, and handed back to you as a QR code. The tools are made for the one person who asked, used, and then thrown away.
## What it is
Most software is built for everyone, which means it fits no one exactly. The tool you need most often is the one nobody built, because the market is just you: a timer for your specific interval, a tracker for the one thing you are watching this week, a calculator for your exact situation.
Oneline lets you speak that need and get a working tool back. You are not a maker shipping to a market; you are the single person the tool is for. When you are done with it, you discard it and ask for the next one.
## How it works
You type a need in plain language. About two minutes later you scan a QR code and the finished tool opens on your phone.
<p align="center">
<img src="assets/how-it-works.png" alt="Four steps: describe the too