1krNote for Android has no purchases inside the app. Plans are chosen on the website:
- Sign in at 1kr.uk (the same account as in the app) and open Plans.
- Choose a 1krNote plan. Or add your own Gemini key under AI key for a free Starter.
- In the app, the plan appears the next time you open it (or sign out and in again). It shows under Account as "Plan: …".
The plan belongs to your account, so it works on any phone you sign in on, Android or iPhone (within its number of phones).
Manage or cancel it on the website under Billing.