A cross-rate desk in twelve currencies and seven weight units, a private ledger for the bars, coins and jewellery you own, a converter for units, purity and premiums, and thirty short reads on how gold is weighed, marked and priced around the world.
Pick a unit and see the reference price in every currency with the cross rate beside it. A range chart shows the path over a day, a week, a month or a year; press and drag to read any point. Once the Vault has entries, a dashed line marks your average cost per ounce.
Each bar, coin or piece of jewellery carries its form, weight per piece, unit, purity, quantity, what you paid and in which currency, the purchase date and where it came from. The ledger totals fine gold and cost basis, splits your holding by form and values every line at the reference price.
Weight turns any amount in any unit into all the others. Value prices a gross weight at a chosen purity in twelve currencies. Purity converts karat to fineness and back, with the pure-gold content of an item. Premium sets a dealer's quoted total against the reference value, as a percentage and per gram.
Units explains why a troy ounce is not an ounce and where the tola, tael and baht come from. Purity covers karat and fineness, British hallmarks, India's BIS code, Chinese 足金 and the Gulf's 21K. Forms compares cast and minted bars, coins and jewellery. Prices walks through spot versus the London fix and the anatomy of a premium. Keeping covers storage, paperwork, purity checks, insurance and borders.
Every figure in the app is a reference. Nothing is bought, sold or held.
Gold prices and currency cross rates are produced by a deterministic model that takes the current time as input. The same moment gives the same value on every device.
Enter the price your dealer or a published fix shows you, in US dollars per troy ounce, and every screen values gold at that number instead.
One troy ounce is 31.1034768 g, one tola 11.6638 g, one Hong Kong tael 37.429 g, one baht 15.244 g, one pennyweight 1.5552 g. Fineness is parts per thousand.