Inoh Docs
Free keeps up to 300 cards, 50 reviews a day and 100 pronunciation practices a month. Inoh Plus raises that to 1,000 cards, unlimited reviews and 1,000 practices a month. Inoh Pro is unlimited cards, unlimited reviews and 10,000 practices a month.
Current prices, monthly and yearly, are on Plan & Billing in the app, which quotes them live rather than from a page that can go stale.
Upgrades, downgrades, cancelling, resuming and fixing a card all happen on Plan & Billing. A cancellation keeps your plan until the end of the period you have already paid for, and your cards stay whatever you do.
Deleting is permanent and takes your cards and review history with it. The account deletion page explains how to ask for it.
What Inoh stores and why is in the Privacy Policy.