Naap Book
The Digital Naap Book, Explained
Most shops in north and central India do not call it a measurement register. They call it the naap book — the notebook by the counter where every customer's naap is written, one page at a time, in whatever order the tailor learned it.
A digital naap book is that same book on a phone. The naap sits against the customer's name rather than a page number, so it is found by typing two letters instead of turning pages while somebody waits. Every set is dated, so this year's numbers and last year's both survive and you can see which is which.
What it adds over paper is not features, it is recovery. A naap book that falls in water, or leaves with the person who wrote it, takes the shop's history with it. A digital one is still there on the next phone.