Calca is a powerful symbolic calculator that gives you instant answers as you type. It solves equations and simplifies complex expressions - it's a computer algebra system in your pocket! It's also a rich Markdown text editor so that you can explain your ideas alongside your calculations. Calca is perfect for professionals and students - anyone who works with numbers and equations. Variables and... - More info on Calca...

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Visualize audio with this handy tool. It displays the frequencies of sound around you over time. The horizontal axis is time, the vertical is frequency, and the intensity of frequencies is shown using pretty shades of red. Use it to: Perfect your singing voice Analyze the call of animals Identify and locate annoying sounds around your house Learn about the world of frequency analysis I hope yo... - More info on Live Spectrogram...

Continuous is a fast and powerful .NET C# and F# IDE that runs directly on the iPad and iPhone (no network needed!). With it, you can write apps and games using your favorite languages on your favorite devices. Continuous is always building and running your code so you can see changes as you type. Writing interactive apps in Continuous is a pleasure compared to the traditional code-build-run cycl... - More info on Continuous .NET C# a...

ICircuit 3D gives you an endless virtual workbench upon which to design and test your electronics projects. It combines the robust electronics simulation engine of the original iCircuit with the latest rendering and 3D physics technology of iOS. Don’t let the physical availability of parts be a constraint on your creativity! Choose from an expansive library of more than 150 physically and elect... - More info on iCircuit 3D...

ICircuit is the premier iPad and iPhone app for designing and experimenting with circuits and Arduinos. Its advanced simulation engine can handle both analog and digital circuits and features realtime always-on analysis. It is the perfect companion to students, hobbyists, and engineers. You use it as you would any CAD program: you add elements, connect them together, and set their properties. Bu... - More info on iCircuit...

Measure your interpupillary distance (IPD / PD) in seconds using the same advanced TrueDepth sensors that power Face ID. No rulers, no mirrors, no accounts, no guesswork. Just accurate results you can trust: perfect for ordering glasses online, setting up VR headsets, or keeping track of your family’s vision. Why Choose This App? * Advanced Sensor Accuracy * Uses the iPhone’s TrueDepth camer... - More info on Pupillary Distance R...

Measure and increase your math agility with this arithmetic speed game. The rules are simple: the app will give you a math problem to solve and you have 20 seconds to do it. Sometimes the problems are easy, like 2 + 2. Othertimes they are evil and mean, like 47.1 ÷ 721 (that's 0.0653 by the way). Sounds hard, huh? It is. So the app is kind and gives you partial credit: you're graded on bell cu... - More info on Math Agility...