MacRumors reports that Apple has updated TestFlight with a search field to help users quickly find apps they are beta testing. The update to version 4.3 also includes bug fixes and performance improvements.
If you run beta programs, the added search should mostly help testers who juggle many concurrent builds rather than change how you distribute anything. Worth checking whether the update touches invite handling or feedback flows, since those are the parts that actually affect your release cycle; a search field alone is a minor quality-of-life fix.
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HTSApp