Numerical³ vs iSPL PRO+

Numerical³ is still the calculator without equal. The first Numerical shipped in 2014—v3 brings long-requested improvements and the same focus on delightful, minimalist utility apps.MAC TOONumerical runs natively on macOS: multiple windows, tabs, resizing, desktop widgets, full keyboard support, and synced history. Download it on the Mac App Store.WIDGETSLock screen and Home Screen widgets—modernized on iPhone and iPad.THEMESBrand-new neo-morphic themes alongside our most popular picks—each with light and dark variants that follow your iOS appearance settings. Use the Theme Picker to preview them all.ICONSTheme Home Screen icons match iOS 26 with glass effects, Dark Mode, and tints.HISTORYYour equations stay visible on screen—above the keyboard on iPhone (portrait) and to the side on iPad and Mac. iCloud keeps history in sync across iPhone, iPad, and Mac.KEYBOARDSExternal keyboards are fully supported on iPhone, iPad, and macOS—including the shortcuts you expect.SOUND FXSounds and clicky feedback on iPhone, iPad, and Mac. Haptics on iPhone.14+ LANGUAGESThe entire app is localized in 14+ languages—including Japanese, Chinese, Korean, and Russian—with international digits and formats. Missing yours? Let us know.Mana Machines—Numerical³ and upcoming apps from a studio focused on delightful, minimal, human-centered utilities. More on the way.Questions or feedback: manamachineventures@gmail.comDeveloped by Andrew J Clark. Designed by Andrew J Clark & Alex Vanderzon.

iSPL PRO turns your iPhone, iPad, or iPod touch into a smart Sound Pressure Level (SPL) meter using the built-in microphone. Measure surrounding noise quickly and easily with both digital and analog display modes. ### Features • Real-time sound level measurement • Current, Average, Minimum, and Maximum values • A, B, C, and D frequency weighting filters • Linear (unweighted) mode • Fast or Slow response modes • High, Normal, or Low time resolution settings • Start or stop measurements anytime with a single tap • Calibration adjustment up to ±10 dB for improved accuracy • Multiple display styles with digital and analog views • Three graphical sound level visualizations • Save and send measurement results via email • Quick reference guide with real-life noise examples (available in unweighted mode) ### Calibration The app comes pre-calibrated for the typical built-in microphone of supported Apple devices. If readings differ from a traditional SPL meter, you can fine-tune accuracy from the Settings screen. ### Important Notice iSPL PRO provides an estimate of environmental sound levels and is intended for general and entertainment use. It is not designed as a certified professional measurement instrument. ### Enjoying iSPL PRO? Please support us by leaving a rating and sharing your feedback.