Car and Equipment Rental Booking Calendar

Car and Equipment Rental Booking Calendar is an offline app (one HTML file in a zip) for a small rental business that runs bookings from WhatsApp and a notebook. You list what you rent and what it costs per day. Each booking shows on a calendar across all its days, the app refuses a double booking of the same item, and it tracks the deposit, the extras, the payments and the balance until the item is back.

The problem it removes: Two customers are promised the same car for the same weekend, a late return is noticed a day too late, and nobody can say how much deposit money is sitting in the drawer. Extras such as delivery and fuel are added from memory. This app puts the diary, the deposits and the money owed in one place.

What is inside:

• Fleet list with daily rate, standard deposit and status, plus what is out now, the next pickup and the income of each item
• Month calendar where a booking is shown on every day it lasts, and a rental board from Reserved to Out to Returned
• A booking that overlaps another booking of the same item is refused, with a clear message
• Days, rental total, extras added on the booking, discount, payments, balance owed and days late, all calculated
• Deposit taken, deposit returned and deposit still held, per booking and in total
• Today dashboard: pickups, returns due, late returns and balances, with a WhatsApp message ready for each customer
• 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: owners of small rental businesses: cars and vans, bikes and scooters, cameras, tools, party and event equipment, who take bookings by message and want a calendar they can trust.

What it is NOT: It does not check driving licences, insurance or fines, and it keeps no ID copies: there is only a box to tick that you checked. It does not take online bookings or card payments, does not send messages by itself, and the agreement is sample wording that you must replace with your own terms. 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 (155 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 1444 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).