Your AI doesn't know
how you work
Sigil gives AI real context about your project — your files, your rules, your style. Upload a project, set your preferences, and download a config file. That's it.
Free to use. No credit card. Works with Claude, Cursor, Copilot, and more.
Three steps, three minutes
No installation. No terminal. No config file knowledge. If you can drag a file, you can use Sigil.
Upload your project
Drag in a folder or ZIP. Sigil reads your files, structure, and patterns — no terminal needed.
Pick your rules
Tell AI how to behave: tone, style, boundaries. Choose a preset or write your own in plain English.
Download & drop in
Get a config file for Claude, Cursor, Copilot — any AI tool. Put it in your project folder. Done.
Built for how you work
Sigil comes with preset rule packs for different ways of working. Pick one, customize it, or start from scratch.
Writers
"Maintain my voice. Cite every source. Cut the fluff."
Researchers
"Distinguish correlation from causation. Flag old sources."
Business
"Lead with the conclusion. Quantify everything. Keep emails short."
Students
"Don't write my assignment — guide me to the answer."
Developers
"No any types. Write tests first. Never hardcode secrets."
Creatives
"Generate 3 options before converging. Challenge assumptions."
The difference context makes
- ✕ AI gives generic, one-size-fits-all responses
- ✕ Doesn't know your project structure
- ✕ Ignores your coding standards and style
- ✕ You repeat the same instructions every session
- ✓ AI understands your files, patterns, and architecture
- ✓ Follows your rules automatically, every time
- ✓ Responses match your voice, style, and standards
- ✓ Set it once — context persists across sessions
Give your AI the context it's missing
Join thousands of writers, researchers, developers, and teams who use Sigil to make AI actually useful.
Get started for free