Tinder has quietly been working on a paid version of its service, Tinder Plus, which adds an undo button and the ability to search outside your location. It looks like it’s close to launching, with Techcrunch reporting today that the company released app updates for the service touting the new features, but those aren’t available for users to use just yet in the US. Tinder Plus has been in testing in some markets, like the UK, Brazil and Germany where pricing can be anywhere from $0.99 to $19.99. In the US, however, it will reportedly be available for $6.99 a month.…

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