Abacus Calculator
Advanced scientific calculator.
Abacus is a passion-project-turned-viable-product. Years ago, I bought a calculator app to help me with my studies because the iOS calculator wasn't enough. In 2023, they transitioned to being a subscription app and got rid of my paid-for features, and stuffed it full of ads.
atgs Abacus seeks to right that wrong. It's already a great scientific calculator, ahead of the iOS by miles, with functions, variables, and graphing. Soon, it will include a companion mode to help you actually LEARN the math, support for common calculus and trig problems, linear algebra support and beyond.
Download for iOSMade for more math
Small details, bigger calculator.
The common keypad is still there, because sometimes you just need the answer. Abacus adds the scientific bits iOS should have had in the first place, without making the simple stuff feel complicated.
Define a function once, then reuse it instead of typing the same expression over and over. It is a small thing until you are five steps into a problem and very tired of re-entering the same math.
The keypad changes with the work. Type functions, constants, trig, powers, and normal numbers without hunting through a drawer full of tiny buttons.
Save values by name so your work can survive more than one line of math. Variables are treated like part of the calculator, not an advanced feature hidden behind three menus.
Turn a variable into a slider when you want to see what changes, not just what equals what. It is the kind of thing that makes functions feel less frozen and a lot more understandable.
When an answer is not enough, graph it and look at the shape. Abacus is meant to help you see what the math is doing, not just hand you a number and call it a day.