Currency converter

Your user types an amount, picks two currencies, and the result appears. It recalculates as they type, with no button to confirm, and a tap on the arrow swaps the two currencies. Below the result, the rate applied is spelled out, with the time of its last update: your user sees the figure and knows where it comes from.

The rate comes from a public exchange service, queried when the section opens. You have no key to provide and no account to open. And if the service does not answer, the section says so and offers to try again, rather than showing a wrong amount.

A travel agency, a shop that sells abroad, a business outlet, an international trade show: as soon as your users think in two currencies, they open another app or a search engine to convert. It may as well be yours that answers. Five currencies ship with it, US dollar, euro, pound sterling, yen and Canadian dollar; adding others is a change to ask the agent for.

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  Nothing to configure, no API key to provide
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  The rate on screen is dated, your user knows how fresh it is
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  One round trip to a search engine saved