- https://notepadcalculator.com/
- https://numpad.io/
- https://bbodi.github.io/notecalc3/notecalc
- https://dedo.io (dead)
- https://numbr.dev/
- https://calcutext.com/ https://github.com/jaredreich/calcutext
- https://cruncher.io
- https://insect.sh/ (dead)
Desktop app
spreadsheet https://myliang.github.io/x-spreadsheet/