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What FOSS calculator app are you using?
(lemmy.ca)
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
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A lot of these (opencalc, yetcalc) look similar, and so does Unitto, but so far this one seems the best so far.
It has more theme options, lots of conversions, and the haptic feedback feels natural enough to me :)