One line in. One precise build prompt out.

Make your coding agent get it right the first time.

1ShotGen expands a one-liner — or a wall of text — into a fully-scoped build brief: tech stack, file structure, edge cases, done criteria. Hand it to Claude Code, Cursor, or Codex and it builds the whole thing in one pass, not five.

Start free Open the app

read it in full ↓

See it generate

Watch one sentence become a build.

This is the real thing — a prepared one-shot prompt, streamed exactly the way 1ShotGen prints it into your screen.

>a live regex tester that explains your pattern

ready when you are

One-shot prompt

warming up the model…

paste this into your AI coding agent

The pipeline

From one sentence to shipped.

STEP 01

Describe

Type one sentence — the thing you wish existed. No spec, no scoping, no setup.

input · 1 line · any idea

STEP 02

Expand

1ShotGen scopes it into a full brief: tech stack, file structure, edge cases, done criteria.

~5k tokens · fully scoped

STEP 03

Ship

Copy it into Claude Code, Cursor or Codex — or download as Markdown — and build in one pass.

copy · download .md · 1 pass

The prompt, dissected

Every prompt scopes the four things agents guess wrong.

A real expanded brief. Watch the parts 1ShotGen nails so your agent doesn't improvise them.

build-brief / markdown-crm.md

Tech stack: Vite + React + TypeScript · IndexedDB (Dexie)tech stackFiles:  store/db.ts · views/Inbox.tsx · lib/markdown.tsfile structureEdge cases: empty first-run · duplicate emails · offline writesedge casesDone when: add/edit/search works · notes render · survives reloaddone criteria

Built for builders

One engine. Any kind of build.

Web apps, static sites, CLIs, Python & Bash scripts, Android & iOS apps, desktop tools — 1ShotGen tailors the brief to each target: the right stack, conventions and done criteria.

Web apps

Full-stack briefs with routing, data layer, state and deploy targets scoped up front.

ReactViteNextAPIs

CLIs

Arg parsing, exit codes, flags, install hooks and friendly failure modes — all specified.

NodeGoPythonRust

iOS apps

SwiftUI structure, views, persistence and platform conventions, mapped before line one.

SwiftUISwiftDataHIG

Everything it scopes, in one field.

move the cursor — poke the engine

tech stackfile structureedge casesdone criteriaReactSwiftUINodeGoexit codesroutingdata layertests ✓

Showcase

Real one-liners. Real builds.

Three things that started as a single sentence and shipped in one pass. Scroll →

WEBGL

3D cloth sim

Grabbable, tearable fabric simulated at 60fps in the browser.

Web app

Markdown CRM

A CRM that lives in plain-text files you actually own.

iOS

Focus timer

A calm, single-button focus timer that stays out of your way.

The subscription math

Paying for 20×. Using 2×.

Claude Max, Cursor Ultra, ChatGPT Pro — $200/month buys roughly 20× the usage, effectively unlimited for one person. The advice everywhere is "don't pay for it unless you're hitting the cap." But the cap was never the bottleneck — having enough sharp, ready-to-build ideas is. 1ShotGen turns every half-formed thought into a one-shot prompt your agent ships clean, so that quota finally gets used. Same subscription. Far more shipped.

Pricing

Start free. Scale when it earns it.

You already pay up to $200/mo for the agent. $7.99 is what makes you actually use it.

Free

3 generations / week, full features. No card required.

3 generations every week
Full scoping: stack, files, edge cases, done criteria
Every build target — web to desktop
Copy or download as Markdown

Start free

Describe a thing.

One precise build prompt out. Then your agent ships it — in one pass.

Start free Open the app