MarcX Studio is an indie app studio that builds small, focused apps for everyday tasks. RooCards keeps loyalty and membership cards ready with widgets, Spotlight and Apple Wallet. Snap Spell turns school word lists into read-aloud spelling practice for kids. NumListen trains your ear for spoken numbers in 8 languages. 成语拾光 is a Chinese idiom puzzle game with 1,700+ levels. Auto Ducking lowers Mac background audio when your microphone turns on. No ads in the learning apps, and each app does one job well.