Handyman Job Book

Handyman Job Book is an offline app (one HTML file in a zip) for a handyman, a small maintenance company or a fit-out subcontractor. You keep a price list of labour and materials with what each costs you and what you charge. A job is built from price list lines, shop receipts are recorded against the job, and the app shows whether everything you bought was billed, what the job earned and what the customer still owes.

The problem it removes: Jobs are priced from memory, a customer is billed for the labour but the fan, the cable and the second door lock bought at the shop are forgotten, and nobody knows which jobs earned money. This app compares what you bought for a job with what you billed, and shows the margin of each job.

What is inside:

• Today page: jobs booked for today, done jobs not yet invoiced, jobs with materials bought but not billed, unpaid invoices and margin this month
• Price list with your cost, your selling price, the markup you actually make and a warning when a price is below your cost or below your target
• Jobs with lines picked from the price list, an optional special price, discount, VAT at the rate you enter, payments and balance
• Shop receipts recorded against each job: the app shows the value of materials bought that are missing from the bill
• Profit and margin per job, with a Low margin flag against a limit you set
• Board from Quote to Invoiced, a calendar of booked jobs, and a printable quote or invoice and an internal cost sheet
• 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: handymen, small maintenance and renovation firms, painters, electricians and plumbers working alone or with a helper who quote by the job and buy materials at shops for each customer.

What it is NOT: It does not keep a stock of materials, pay your workers or track working hours. The markup and margin limits are numbers you enter, not advice on what to charge. The invoice layout is an example, not a promise that it meets the invoice rules that apply to you. 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 (188 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 2239 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).