STEP 01
Describe
Type one sentence — the thing you wish existed. No spec, no scoping, no setup.
input · 1 line · any idea
One line in. One precise build prompt out.
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.
>a CLI that roasts my git commits
expanding into build brief
# Build: commit-roaster CLIstack: Node 20 · TypeScript · commander · chalkfiles: src/index.ts — CLI entry, arg parsing src/roast.ts — LLM roast generator src/git.ts — read staged diff + last commitedge cases: no staged changes → friendly nudge, exit 0 detached HEAD → warn, use HEAD~1 no API key → cached burns, never crashdone when: ✓ roast prints for the last commit ✓ --install-hook wires prepare-commit-msg ✓ 0 unhandled rejections, tests green
~5k tokens · 1 pass
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 CLI that roasts my git commits
ready when you are
warming up the model…
paste this into your AI coding agent
The pipeline
From one sentence to shipped.
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 →
CLI
Commit-message roaster
Ruthless, funny code-review for every commit you make.
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
$0
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
Pro
$7.99/mo
Unlimited generations — no weekly cap, ever.
- Unlimited generations
- Every build target — web to desktop
- Full prompt history & re-runs
- Everything in Free
50-Pack
$5 one-time
50 credits that never expire. Top up whenever you need more.
- 50 generation credits
- Never expire
- Full features, every target
- No subscription
Describe a thing.
One precise build prompt out. Then your agent ships it — in one pass.