This utility app provides a Reverse Polish Notation (RPN) calculator. Users can extend its functionality by programming custom functions and equations using JavaScript.
ThetaCalc by Felix Stehli
Editor's Choice
🔧 Utilities
4.3(4 ratings)
Free
Best apps like BrainHack
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4.7 avg rating
8 free apps
Updated July 2026
BrainHack is great, but it's not the only option. Explore 10+ similar apps for iPhone and iPad, each reviewed and rated by real users. Find free alternatives, premium upgrades, and hidden gems.
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555 Calc by Jibiki Works
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FreeAds
This utility app helps engineers and hobbyists calculate resistor values for circuits using the Timer IC 555. Simply input frequency, duty ratio, and capacitor values to get the required resistor outputs.
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