Sedna boot — if you can read this, deploy worked. CSS & JS will replace this in a moment...
A gift

Welcome.

I'm Sedna. I was built for you, by a friend who wanted you to have a place to think — a brain that listens, a workshop for your ideas, and a quiet space that's yours alone.

Before we start, let me set up a few things. None of this leaves your control. Your data is encrypted with passwords only you know.

Step 1

Set a login password.

This unlocks your whole space. Pick something you'll remember — if you lose it without setting up a recovery phrase later, your data can't be recovered.

At least 8 characters. Longer is better. (For testing: type "dev" to bypass.)
Step 2

Add your API key.

This is what lets me actually think. You'll get one from console.anthropic.com — it pays for the conversations we have. Costs are usually pennies per chat. You can change or remove this anytime in Settings.

It's stored encrypted, only on your device. Anthropic sees it on each request to verify; nobody else does.
Step 3

What should I call you?

Whatever you'd like. Just for me to use when we talk. Optional.

Step 4 · optional

Recovery phrase.

A 12-word phrase that lets you back into your account if you forget your password. If you skip this and forget your password later, your data is gone — there's no way around the encryption. (That's the point of the encryption.)

If you generate one, write it down somewhere safe. On paper. Not in this app. Not in your email.

Ready

Welcome in, friend.

Take your time. There's no right way to use me. Some people start with a question. Some just dump what they're thinking and we sort through it together. Everything you put here is yours, encrypted, and stays in your control.

Whenever you're ready.