Aurora Calculator – 991-Style
991-style scientific calculator for Android with PROB & BASE
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marjan svrzic

Aurora Calculator – 991-Style - 991-style scientific calculator for Android with PROB & BASE

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Aurora is a Swiss-army-knife scientific calculator for Android. It combines a 991-style sci calc with matrix & base-N modes, PROB/STAT/LOG tools, constants, memory, DMS and rounding helpers. On top you get 2D/3D graphing, algebra, converters, geometry and finance modules – all in one clean, offline-friendly app.

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marjan svrzic
Maker
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Hi everyone 👋 Aurora started from a simple idea: put all the calculator tools you actually need into one clean app, without paywalls or aggressive ads. There are many great calculators already, but I kept bouncing between different apps for scientific work, base-N, probability/statistics, graphing, converters, geometry, finance, etc. Aurora tries to bundle these into a single interface that feels familiar but much more capable. The app is free, there are no premium feature paywalls, and the only monetization is a small banner ad – no full-screen popups or interruptions while you’re calculating. I’d really love feedback from you: – Which modes do you use most (sci, graphing, converters, finance…)? – What’s missing for your workflow that would make Aurora your default calculator? Thanks for checking it out and for any suggestions you have! 🙏
Salma Ghana

@marjan_svrzic Such a smart idea, and it’s executed beautifully!

Alexander Dushin
Maker

Incredible tool with so much functionality - honestly comparable to or even better than some paid calculators. Everything is straightforward, intuitive, and easy to use, yet still powerful. Super useful for everyday calculations and more advanced needs. Highly recommend!