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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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I just open up Qalculate in Termux.
Qalculate is great. I wish there was an up-to-date Android version.