One Tuner vs PlayStems

OneTuner does one thing and does it well. Open the app, play a note, and instantly see if you're in tune. The screen shows your note in solfege notation with a precision needle meter. When you're in tune, everything turns green. When you're not, you see exactly how many cents sharp or flat you are. There are no menus, no settings to configure, no buttons to press. OneTuner starts listening the moment you open it and stops when you leave. It works with any instrument — guitar, piano, violin, cello, ukulele, flute, voice, anything that makes a pitch. No ads. No account. No subscription. No internet required. No data collected. Your audio never leaves your device. OneTuner is the tuner you open when you just want to tune and get back to playing.

PlayStems is a powerful yet easy-to-use multi-track audio player designed for musicians. Import songs, split them into stems, and play all audio tracks perfectly in sync across iPhone, iPad, and Mac. Build your own song library with custom titles and artists, add multiple audio files to each song, and control every stem independently with a built-in mixer. Adjust playback speed and pitch in real time, jump through tracks with intuitive drag gestures, and create loop ranges for practice or live performance. Features: * Multi-track stem playback in perfect sync * Song library with custom titles and artists * Import and manage multiple audio files per song * Individual and master volume controls * Real-time speed and pitch adjustment * Smooth forward/backward scrubbing gestures * Loop playback for selected time ranges * AI-powered stem splitting into vocals, drums, bass, and other instruments tracks (runs on your device) Whether you’re rehearsing, performing live, remixing, or practicing difficult sections, StemSync gives you complete control over your music. # Free version * Free version is limited to 1 song if the user does not consent to analytics * With analytics consent, the free version is limited to 5 songs # Full version * Full version (perpetual license) has no limitations * HQ stem splitting models available for download (requires iOS 26.4 or later and about 2 GB of available memory on recent iPhone, iPad, or Mac with Apple Silicon).