SaleStats provides small business owners with a simple way of keeping track of their customers and products. Its ideal for the kind of small home business that many people have these days, where they sell such things as tea, makeup, kitchenware, etc. to their friends and neighbours.
The SaleStats app keeps all of this information in an SQLite database file. You can export a copy of this file as an email attachment. Then you can keep the file as an archive, or load it into one of many freely available database apps.