Flip - Currency Converter might be a bit more popular than Currencies. We know about 1 link to it since March 2021 and only 1 link to Currencies. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Currencies: Exchange Rate Calculator (version 1.16.2): An exchange rates currency converter for Android. Source: almost 2 years ago
I guess it depends on your definition of "safe". BuzzKill is developed by Sam Ruston, a trusted developer. People usually install his apps to be safe (Bouncer, for example). Source: almost 3 years ago
XE.com - XE.com Inc. (XE) is a Canadian online foreign exchange services company.
Tweetbot - Sync your timeline across your iPhone, iPad, and Mac. Mute tweets by user, hashtag, tweet source, or keywords (including regex). 3rd Party support for image, video, read later, and timeline sync services.
Cocorate.com - Online currency and cryptocurrencies exchange rates calculator helps you convert anything in real-time.
Yahoo! Finance - Currencies Center - Currency Converter from Yahoo! Finance.
xCurrency - Smart Currency - A simple ads-free currency converter.
Elk - The fastest way to convert currencies on mobile.