Repair Parts Stock and Job Margin Tracker

Repair Parts Stock and Job Margin Tracker is an offline app (one HTML file in a zip) for a repair bench. You record each purchase of parts, then the parts used on each job. The app keeps the count of every part, flags what to reorder, works out the average cost of each part and shows the margin on every job: what you charged for parts and labour minus what the parts cost you.

The problem it removes: The cost of a part is known when it is bought and forgotten when the repair is priced. Parts run out without warning, a part used on a job is never written down, and at month end nobody can say whether the repairs made money. This app matches the part cost to the repair charge job by job.

What is inside:

• Parts list with shelf bin, reorder level, average purchase cost, stock on hand, stock value and an Out, Reorder or OK flag
• Purchases (stock in) and stock corrections (damaged, lost, count corrected) so the count follows what is on the shelf
• Jobs with parts charge, labour charge, other direct cost, parts cost taken from the parts used, margin in AED and as a percent
• A rule that stops you using a part that is not in stock (you can switch it off), and a rule that stops closing a job with no price
• Today page: parts to reorder, jobs under your target margin, and finished jobs where a part was charged but never recorded
• Printable job costing sheet and reorder list
• 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 phone, tablet and laptop repair workshops who buy parts from a few suppliers, price repairs by feel, and want to know the true margin and when to reorder.

What it is NOT: It does not handle customers, tickets, receipts or warranty: it is the parts and costing side only. It is not a full inventory or accounting system, it has no barcode scanning, and it does not know supplier prices or compatibility: you enter them. The cost of a part is the average of your purchases, not a batch by batch cost. 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 (126 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 1419 calculated values (25 randomised rows plus the example data) with 0 mismatches. Not tested: Safari and Firefox beyond what is stated here, and no real printer was used (print layouts were checked as PDF).