Welcome toIndie App Spotlight. This is a weekly 9to5Mac series where we showcase the latest apps in the indie app world. If youre a developer and would like your app featured, getin contact.TechniCalc is a fully featured calculator app, with all of the advanced features youd need but without a clunky or outdated UI. It focuses on being clean, easy to use, while being good for mathematicians. Its available for iPhone, iPad, Mac.Interface highlightsMany advanced calculator apps feel like theyre out of the 90s still, but not TechniCalc. Its beautiful interface scales nicely across iPhone, iPad, and Mac. It also has both light and dark mode. The developer focused on making two key interactions better than the competition, making it nice to use.When youre typing an equation, TechniCalc keeps everything visible, whereas some apps like to hide the previous number you typed after pressing plus or whatever else. This allows you to easily read your equation.On top of that, the keyboard is fully featured in both portrait and landscape, reducing the need to rotate your device. It does this by grouping things in submenus behind buttons, allowing the interface to look clean while still retaining over 100 calculator buttons. For example, if you press and hold on degrees, you have a submenu that shows you arcminutes and arcseconds. You can also press and hold on sin for arcsin, and so on.Math capabilitiesOn top of being able to do basic calculations, TechniCalc has mostly everything youd want out of a fully featured calculator, including the following:BracketsSquare and cubic rootsExponents and logarithms TrigonometryTrigonometry (sin, cos, tan)Degrees, radians, and gradiansConstants (pi, e, and over 100 other physical constants)It also has a formula book, calculation history, a built in unit and currency convertor, and a statistics mode.For advanced math, it also supports the following:Almost unlimited number sizes over 1,000,000 factorialSquare roots and logarithms with any baseFactorial, nPr, nCr, and gammaHyperbolic trigonometry (sinh, cosh, tanh)Vectors and matricesImaginary and complex numbersSeries sums and productsNumerical integration and differentiationBinary, octal, and hexadecimalProgrammer modeWhatever you need from your calculator, TechniCalc likely has you covered.TechniCalc is available as a one time purchase on the App Store, with no ads or subscriptions for just $7.99. Once purchased, thats it theres no additional upsells or anything else to worry about.Follow Michael:X/Twitter,Bluesky,InstagramAdd 9to5Mac to your Google News feed. FTC: We use income earning auto affiliate links. More.Youre reading 9to5Mac experts who break news about Apple and its surrounding ecosystem, day after day. Be sure to check out our homepage for all the latest news, and follow 9to5Mac on Twitter, Facebook, and LinkedIn to stay in the loop. Dont know where to start? Check out our exclusive stories, reviews, how-tos, and subscribe to our YouTube channel