qalc also tracks and converts units, and is open source (practical benefit: runs offline). I have it on Android via a Debian subsystem but just checked and Term

qalc also tracks and converts units, and is open source (practical benefit: runs offline). I have it on Android via a Debian subsystem but just checked and Termux simply has it also (pkg install qalc) Random example off the top of my head to show off some features: say it takes 5 minutes to get to space, and I heard you come around every 90 minutes, but there's differing definitions on whether space is 80 or 100 km above the surface, then if you're curious about the G forces during launch: (2*pi*(6350+ 90±10)km / 90 minutes) / 5 minutes to gees ((2 × pi × ((6350 + 90±10) kilometers)) / (90 minutes)) / (5 minutes) ≈ 2.5470±0.0040 gees (the output has color coding for units, constants, numbers, and operators) It understands unicode plusminus for uncertainty tracking, units, function calls like log(n,base), find factors, it will do currencies too if you let it download a table from the internet... I love this software package. (No affiliation, just a happy user who discovered this way too late in life) It's not as clever as WolframAlpha, no natural language parsing or Pokédex functions (sometimes I do wish that it knew things like Earth radii), but it also runs anywhere and never tells you the computation took too long and so was cancelled Edit: I just learned there's now also an Android app! https://github.com/jherkenhoff/qalculate-android https://github.com/jherkenhoff/qalculate-android | https://f-droid.org/packages/com.jherkenhoff.qalculate/ https://f-droid.org/packages/com.jherkenhoff.qalculate/ I've checked before and there wasn't back then, so this is cool. This version says it supports graph plotting which the command-line version doesn't do