You're not signed in

Buying links the purchase to your watch, so open the personal link we emailed you – then come back here.

Email me a new link

Get the full app

€10 one-time

• Jump logbook + freefall graphs, forever on your watch
• The altimeter itself stays free for everyone, always

You have complimentary access as a beta tester – buying is entirely optional, and very appreciated.

Buy – secure checkout via Stripe

You already have it

This account is fully unlocked. Nothing more to buy.

Your watch picks the unlock up on its next status fetch – usually within a few minutes of being online.

Thank you!

Payment received – your account is being unlocked.

Your watch picks the unlock up on its next status fetch – usually within a few minutes of being online. The receipt arrives by email from Stripe.

Blue skies!

Checkout cancelled

No payment was made. You can try again any time.

Back to the buy page