Masjids, madrasas and small charities still write receipts and fee slips by hand and copy timetables onto paper. These tools produce the same documents cleanly, with your institution’s logo, and the amount written in words using lakh and crore where money is involved.
They run in your browser and upload nothing, so donor and student details stay on your own device. They print what you type: they do not decide whether a payment is zakat, sadaqah or anything else, and the timetable never calculates prayer times.