Reor is described as 'powerful calculator blended into perfection with a winsome interface. Reor is freeware, licensed under GNU General Public License (Version 3)' and is an app in the Education & Reference category. There are more than 50 alternatives to Reor for a variety of platforms, including Android, Mac, Windows, iPhone and iPad. The best alternative is SpeedCrunch, which is both free and Open Source. Other great apps like Reor are Qalculate! (Free, Open Source), Windows Calculator (Free, Open Source), Soulver (Paid) and Calculator (Free).
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