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
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4.3(4 ratings)
Free
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3.8 avg rating
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Updated July 2026
Whether you want more options like Wacky Conversions or a completely different take on the same concept, our curated list of 12+ similar apps has you covered. Updated for 2026 with the latest ratings and comparisons.
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FreeAdsIn-App Purchases
This utility app offers a powerful calculator and a comprehensive unit and currency converter. Customize your display by selecting specific units and categories, and perform conversions instantly with its clean interface. It supports over 500 units across 29 categories, including 161 currencies.
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Translate text, voice, and images between English and Romanian. This tool offers real-time translation for conversations, documents, and visual content, making it useful for daily communication, travel, and language learning.
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