SPEC GUN

Idea in your head, but the AI keeps building the wrong thing? Spec Gun turns your half-baked idea into the exact instructions an AI needs — so it nails it the first time.

Works with Claude, ChatGPT, anything. Free. Your work auto-saves as you type.

1 · TELL IT
Your rough idea
As vague as you want — "a study timer," "something for my mornings."
2 · IT DIGS
Fills the gaps
It asks the few sharp questions that decide whether the build comes out right.
3 · YOU SHIP
Copy the perfect prompt
Paste into any AI and get what you actually pictured — in one shot.
🎤 EASY MODE
🔨 DETAILED
🐛 FIX A BUG
What are you building?
Picking a type swaps in sharper questions below.
🛠 App / Tool
🪙 Crypto / on-chain
🐦 Twitter / automation
⚙️ Automation / Script
🌐 Website / Landing
🎮 Game
📄 Doc / Content
1. One sentence: what is it?
"A tool that ___ for ___." Can't say it in one sentence = AI can't build it in one shot.
2. Who uses it, in what moment?
Not "everyone." One person, one situation.
3. Format?
Single HTML file
Cloudflare Worker
Python script / bot
Mobile-friendly web app
Website
Document
Let AI decide
4. The 3 things it MUST do
Three max. Everything else is v2.
5. What should it NOT do / have?
Negative space saves more revisions than features. "No login, no settings."
6. "Done" means…
A test the AI checks itself against before showing you. Biggest loop-killer.
7. Vibe (optional)
A reference beats adjectives. "Like Stripe's site" > "clean and modern."
Your rough idea — as vague as you want
This mode flips the script: the AI interviews YOU, one question at a time, then writes the spec itself and gets your sign-off before building. Zero homework.
Anything you already know? (optional)
Format, deal-breakers, references — whatever's already decided in your head.
How deep should the interview go?
Quick — 3 questions
Standard — 5 questions
Thorough — 8 questions
1. What did you DO, exactly?
2. What did you EXPECT?
3. What actually HAPPENED?
"It's broken" forces a guess. Describe what you saw — or didn't.
4. Any error text? (the goldmine)
F12 → Console → copy anything red. This alone usually one-shots the fix.
5. Environment

📋 Your prompt

one-shot odds: —

        

        
        

          
          
          
        

      

      

        
🗂 Saved briefs

        
Nothing saved yet. Every brief you save lands here — v2 of anything starts from the v1 brief.