The question worth asking on the first day, because it is the one nobody asks until the day it is too late.
Your bills, your udhaar book and your stock list, as files, free, whenever you want them, with no limit and no support request. It is in the app under your own records, not behind a plan. Export will never become a paid feature — it is on the list of things this product has written down that it will not charge for, on a public page, before there was any pressure to.
The book is yours and always was. It also does not become a spreadsheet, so 'taking it with you' means carrying two years of handwriting to whatever you use next and typing it in — which is the same evening's work as starting from scratch.
Commonly an export on a paid tier, or a support request, and sometimes a format that only that product reads. This is not usually presented as a lock-in; it is presented as a feature of the higher plan. The test is the same either way — ask what export costs before you have two years in it, not after.
The columns above describe categories, not products, and that is deliberate. A claim about somebody else's app is true on the day it is written and stops being true the week they ship something — so a page with a rival's name on it ages into a false statement that we then have to be told about. What is described instead is a pattern of behaviour you can check against whatever you are actually using, in about a minute, without taking our word for any of it.
No card and nothing to cancel. Install it, sign in with your phone number, and the shop is yours from the first bill.