Owner Contribution Collection Tracker by Unit

Owner Contribution Collection Tracker by Unit is an offline app (one HTML file in a zip) for the treasurer or manager of an owners association or building committee. You list the units with the regular contribution each pays. At the start of each quarter you press one button to raise a demand for every unit, record each payment as it arrives, and the app shows every unit's balance and how old the unpaid amount is. A chase log keeps what each owner promised, and statements and reminders print for any unit.

The problem it removes: Which units have paid is found out by calling, and the treasurer cannot say how much is overdue or for how long. Part payments, advance payments and promises are remembered by one person. This app keeps a demand line and a payment line for every unit, clears the oldest demand first, and lists the units to chase with the amount, the age and the last promise.

What is inside:

• Units with owner, mobile, regular contribution and a not billed switch
• Raise this quarter's demands for every billed unit in one tap, once only per unit and quarter, with the due date set from your own number of days
• Special levies and other demands, entered one by one with a period label such as Roof repair
• Payments with automatic receipt numbers, part payments and advance payments shown as a credit
• Overdue amount per unit split into 1 to 30, 31 to 60, 61 to 90 and over 90 days, with payments applied to the oldest demand first
• Chase log with promised dates, a broken promise list with WhatsApp messages, unit statements, receipts and reminder letters
• Example data you can load in one click, a Start here guide and an Honest limits panel
• JSON backup and restore, CSV export, and CSV import with a check of every row before anything is added

Who it is for: treasurers, secretaries and property managers of owners associations, residents committees and small buildings who collect service charges and special levies from a few dozen to a few hundred units.

What it is NOT: It does not work out what each unit should pay: you enter the amounts (a budget split tool does that step). It does not add late fees or interest, take payment online, or send messages itself (it opens WhatsApp with the message ready). It gives no advice on what you may charge or how to recover money, and its reminders are plain reminders, not legal notices. It is not legal, tax or accounting advice, it is not connected to any government system, bank or messaging service, and it does not file or send anything by itself. UAE e-invoicing is not part of it.

Your data stays on this device in your browser. Back it up with Export; clearing browser data loses it otherwise.

Verified by us: scripted tests in Chromium (171 checks through the real screens: adding, editing and deleting records in every table, required-field messages, backup then clear then restore, CSV export then import, keyboard order, print layouts rendered to PDF, no horizontal scrolling at 375 and 1280 pixels, no network requests) and an independent recalculation by a separately written Python evaluator of 1764 calculated values (25 randomised rows plus the example data) with 0 mismatches. Safari engine (WebKit): smoke test passed; Firefox: could not be launched. Not tested: Firefox beyond what is stated here, and no real printer was used (print layouts were checked as PDF).