Start building today.
Free to use.
All you need is Claude Code. Copy three prompts and Claude sets up everything else.
- ✓Open source (MIT)
- ✓No credit card
- ✓No trial period
Step 1
Add Effortless to Claude Code
Open Claude Code and ask for it in plain language. Claude installs the Effortless skills so it knows how to work with rulebooks.
Install the Effortless skills for Claude Code from https://github.com/EffortlessAPI/effortless-skills. Clone the repo and run the install script for my operating system.
Step 2
Describe your app in one sentence
Tell Claude what you want to build. It writes the rules, sets up the database, and gives you a working app with sample data. If something is missing on your computer, Claude installs it.
Make this an effortless demo for a gym that invoices members per training session.
Step 3
Change a rule and watch it follow
Ask for a change in plain language. Claude updates the rule in one place, rebuilds, and the whole app follows. That's the part that stays effortless as your app grows.
Add a 10% late fee when an invoice is more than 30 days overdue.
Explore first
See real rulebooks
before you build.
Every example is public. Browse them on GitHub, or let Claude walk you through one.
Open the rulebook repoOr ask Claude for a tour
Paste this into Claude Code. It opens a small example and explains how one rule shows up everywhere.
Clone github.com/effortlessapi/effortless-rulebooks and walk me through toy-rulebooks/acme-llc.
Toy rulebooks →
Small, simple domains. One rulebook runs as Postgres, Python, Excel, plain English and more.
Real-world examples →
Banking, traffic ticket contests, business rules and more. See how far one rulebook goes.
Watch the tour →
One rulebook, many runtimes: a short video walk through the repository.
Want help?
We'll get you there faster.
See it on your own use case in a 30-minute demo, or book a hands-on training session for you or your team.