Optional, always

Make an account

Or sign in if you already have one.

You do not need an account to use anything here. Every instrument, every result and the couple comparison work signed out, and nothing you answer leaves your browser. An account changes one thing: your results are kept, so they survive a new phone, come with a link you can send, and carry a family pass with them.

What this stores: your email address, a hashed password, and a name if you give one. From then on, results you finish are saved to your account — and anything already in this browser moves across and is cleared from it. That means your email sits alongside what you answered about how you parent, which is exactly why an account is optional. You can delete it, and everything attached to it, from your account page at any time.