Multi-Currency Price List and Margin App

Multi-Currency Price List and Margin App is an offline app: one HTML file in a zip that opens by double-click, with no installation, internet or subscription.

The problem it removes: A trader buys in euros or pounds or yuan and sells in dirhams, or the reverse, and the price list is a spreadsheet with an exchange rate someone typed last month. A quote goes out at an old rate, the margin quietly turns to zero when the currency moves, and nobody knows what the company is exposed to in open foreign-currency invoices and supplier bills until the bank statement arrives.

What is inside:

• A rates table: AED per one unit of each currency, with the date of each rate, history kept, and a warning when a rate is older than the days you choose. USD is built in at the dirham peg of 3.6725
• A quick converter between any two currencies in your table
• A price list: each product with its cost and its price, each in its own currency; margin in AED now, the exchange rate at which margin reaches zero, the rate at which it reaches your target margin, and the effect of a 5% or 10% move
• Quotes and invoices priced in AED and shown to the customer in their currency, with the rate, its date and your buffer locked on the document, a validity date and a print layout
• An Exposure sheet: open invoices and supplier bills in foreign currency, net position per currency, unrealised gain or loss against the rate you booked at, and the effect of a 5% move
• Settle an item at the rate you actually got and the realised gain or loss is recorded
• Example data, CSV export, JSON backup and restore

In the zip: index.html (the app), README.txt (quick start, how it calculates, limits) and EXAMPLE-DATA with a made-up example you can restore. Start in 10 minutes: open index.html, press Load example data, look around, press Clear everything and enter your own settings.

Rules are settings, not built in. Every rate other than the USD peg is typed in by you from your bank, with its date. The stale-rate warning, the default FX buffer on quotes and your target margin are settings. Check the peg with your bank if it matters to a contract.

Who it is for: importers, exporters, trading companies and project suppliers who buy or sell in more than one currency and want a margin they can trust at today's rate.

What it is NOT: a source of live rates, a treasury system or accounting software. There is no internet lookup, so a rate is only as recent as the one you typed. Amounts are held to two decimals, so currencies with three decimals (BHD, KWD, OMR) are rounded to two. Gain and loss figures are a management view against rates you entered, not accounting entries or tax advice. Your bank's real rate differs from a mid-market rate by its margin and fees. Marketplace Price and Margin Calculator is for online sellers and marketplace fees; this app is for foreign-currency pricing and exposure.

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

Verified by us: 81 scripted checks through the real screens in Chromium, run at 1280 px and at 375 px, including an independent Python recomputation of margins, breakeven rates, target-rate and 5% and 10% shifts for every product, locked rates on documents, a refresh after adding a new rate, an exposure settle worked by hand (8,000 GBP at 4.80 against a booking rate of 4.95 gives a realised loss of 1,200.00), settings, CSV export and backup. The quotation was rendered to PDF in Chromium and looked at. Not tested in Firefox or Safari (neither could be launched in our test environment), in Edge, on a real phone, on a real printer, or with real bank or accounting exports; layout checked at 375 px and 1280 px.