Getting Started
Sigma Domain is an AI workspace powered by Claude. You can start using it as a guest with no account. Here's the short version:
1. Just Start Talking
Describe what you need in plain English. Sigma Domain picks the right tool for the job — there's no prompt engineering and nothing to configure first.
2. Create an Account
Guests can try everything, but an account keeps your conversations, files, maps and tools. Free accounts keep your data; see Plans for higher limits.
3. Add Your Own Tools
Register your APIs and functions so the AI can call them for you. Keep them private, share them with your team, or publish them to the marketplace.
4. Hand Off Real Work
Ask for an outcome and let it run: multi-step jobs, finished documents, live shared maps, or a narrated audio tour of wherever you are.
Full walkthroughs live in the documentation — start with Getting Started.
Frequently Asked Questions
What is Sigma Domain?
Sigma Domain is a massive AI toolkit marketplace powered by Claude. Thousands of tools are already connected and ready to use — instead of being limited to what one chat app can do, you just ask in plain English and the assistant calls the right tools for you. You can add your own APIs too, but you don't have to. See the
product overview.
Which AI models does it use?
The main conversation is powered by Claude. When you want a second opinion, tap the brain button to run the same question past a catalog of 70+ other leading models and get a summary of where they agree and differ. More detail in
AI Models.
How do I register my own tool or API?
Open the tools section and register the function — name, description, parameters, and endpoint. There's no limit on how many you can add, and you choose whether a tool stays private, goes to your team, or is published publicly. Step-by-step instructions are in
Registering Your Tools, and you can also
import an existing OpenAPI spec.
Can I charge other people to use a tool I publish?
Yes. Tools published to the marketplace can be monetized per call. See
Publish a tool for how pricing and payouts work.
What are Skills?
Skills are expert playbooks the AI loads on demand so answers come back as finished files rather than text — real .docx, .xlsx, .pptx and PDF documents you can open and send. See
Skills.
How does the audio tour guide work?
Start a tour and Sigma Domain narrates the places you pass — history, architecture, and stories — spoken aloud as you drive or walk. It uses your device location to know what's around you, and you can filter the kinds of places you want to hear about.
Can I work with other people in the same conversation?
Yes — invite people into a shared conversation with the AI in the room, or build a live map together and compare and vote on locations as a group. See
Collaborate.
Where is my data stored, and how secure is it?
Every account gets its own database that only you can reach, and data is encrypted in transit and at rest. We never share your data with third parties without your explicit consent. See
Storage, the
personal database docs, and our
Privacy Policy.
How do I delete my data or close my account?
You can delete individual conversations, files and tools at any time, or remove your account and everything in it. Instructions are in
Deleting Data. If you need help, email
[email protected].
What does it cost?
You can try Sigma Domain as a guest with no account. Free accounts keep your data, and the Standard plan is $5 a month for higher limits with pay-as-you-go beyond them. Current details are on
Plans and pricing.
Which platforms is it available on?
Sigma Domain runs in any browser, as an iOS and Android app, and as a desktop app for macOS and Windows. See
Download.