Invoice Total Checker

WHAT IT DOES

Invoice Total Checker scans the current page for invoice line items — descriptions, quantities, unit prices, and line totals. It calculates the subtotal, applies your tax rate, and computes the grand total. Then it searches the page for any displayed total (grand total, amount due, balance due) and compares it to the calculated total, highlighting whether they match or differ.

WHERE IT RUNS

This script runs on any website you visit — invoice pages, order confirmations, shopping carts, billing portals, or any page with line-item data. It reads only the page you are looking at, never other tabs, bookmarks, or browser data.

HOW TO USE

Click the Invoice Total Checker panel button in the BotGentz extension toolbar. The panel appears at the edge of the page. Set your tax rate (default 10%), then click "Scan Invoice". The panel displays all detected line items with quantities, unit prices, and totals. It shows the subtotal, tax, calculated grand total, and — if a total is found on the page — compares it and flags any discrepancy. Use "Copy Result" to copy the full breakdown to your clipboard.

TECHNICAL MECHANISM

The tool scans the DOM for table rows with multiple numeric values (quantity, price, total) and extracts them as line items. It also scans page text using regex to find invoice-like patterns when tables are not present. It detects displayed totals by searching for common total selectors (.total, .grand-total, .invoice-total) and regex patterns in the page text. The calculated total is compared against the detected total with a 0.01 tolerance. All scanning and calculation runs client-side in pure JavaScript, with no external dependencies.

THE PANEL

The panel is a floating overlay that you can drag anywhere on the screen by its header. It remembers its position per site so it reappears where you left it. The panel can be collapsed into a small handle to get it out of the way, and snapped to the edge of the page. It can be resized to fit your workflow. Press Escape to close the panel.

PLEASE NOTE

This script requires the free BotGentz extension to run. All data stays in your browser — nothing is transmitted or shared. The panel works on any website. The scanner works on many common invoice formats but may not detect all layouts. You can adjust the tax rate and rescan. Sites change — the script may need updates to match new site structures.