ZZZ Polyrhythm vs Dorebit

Zzz Polyrhythm is a polyrhythm-focused metronome that lets you layer multiple rhythms simultaneously for advanced rhythmic practice. From classical 2-against-3 to jazz shuffle to contemporary 7-against-11 — instantly build any rhythm pattern you can imagine and play it back with professional-quality voices. Key Features [Base Beat — the time-keeper] - Time signature: any numerator (1-16) and denominator (2 / 4 / 8 / 16) - BPM: precise control from 30 to 240 - Tap Tempo: detect any tempo in real time - 8 voices: Wood Block / Click / Cowbell / Sine / Square / Tick / Hi Click / Low Thud [Layered Rhythms — Overlay] Layer additional rhythms on top of the base beat to construct complex polyrhythms. - Starting beat: not only "beat 1, beat 2" but also fractional positions like "beat 1.5" - Length: whole / half / quarter / eighth / sixteenth / thirty-second note × none / dotted / double-dotted - Subdivisions: any tuplet from 2 to 11 - Shuffle mode: play only the first and last clicks for a jazz swing feel - Timing offset: slide the start/end positions back and forth to fine-tune swing - Voice: choose an independent voice for each overlay from 8 sound presets [Visualizer] Concentric ring display lets you see rhythm timing at a glance. A dot lights up the moment each click fires, helping you grasp polyrhythm structure visually. [Presets] (Premium) Save your favorite rhythm configurations with custom names. Recall with one tap. Browse multiple presets and switch any time. [Phase-preserving BPM changes] Change BPM in the middle of a beat — the rhythm doesn't reset, it smoothly accelerates or decelerates, just like a professional studio metronome. Who it's for - Drummers / percussionists training complex rhythmic sense - Jazz / fusion players developing swing feel - Instrumentalists practicing 3-, 5-, 7-tuplet figures - Composers / arrangers analyzing multi-voice rhythm relationships - Performers studying traditional cross-rhythms and contemporary music Languages 日本語 / English / 中文 / 한국어 / Español / Português Switch languages manually from the hamburger menu, or have the app follow your device's system language. Free vs Premium [Free] - Base beat + up to 2 overlay layers - All 8 voices / any time signature / BPM 30-240 - Tap Tempo / Shuffle / full feature access - Discreet banner ad + occasional interstitial [Premium (Ad-free)] - All ads removed - Add 3 or more overlay layers (unlimited) - Save / load / delete rhythm presets Subscription Details - Title: Premium (Ad-free) - Length: 1 month, auto-renewable - Price: 180 JPY / month Payment will be charged to your Apple ID account at confirmation of purchase. The subscription renews automatically unless it is canceled at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage or cancel your subscription anytime in your App Store account settings after purchase. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://smolt-stage.com/home/privacy/zzz-polyrhythm-privacy-policy-ios-en.html Developer SMOLT STAGE, K.K. © 2026 SMOLT STAGE, K.K. For questions and feature requests, please use the in-app feedback form. We hope this contributes to your musical practice.

Dorebit is an ear-training app that builds your ear step by step with quizzes. Listen, answer, and hear the correct note sung back, so each sound and its name stick together. ■ FOUR KINDS OF QUIZZES • Notes: hear a single note or a short melody and answer on the keyboard • Chords: name the chord you hear • Chord progressions: put the chords you hear in order Levels rise as you improve. See how far you can get before time runs out. ■ ANSWERS SUNG BACK The correct notes are sung in solfège. Choose Fixed Do, Movable Do, numbers or note names (C D E) to hear them your way. The voice can be Japanese or English. ■ KEYBOARD AND MIDI Check any note on the on-screen keyboard, or connect a Bluetooth MIDI keyboard. You can also play along with a chord-progression backing. ■ SEE WHAT TO WORK ON High scores, accuracy and a mastery map show what to practice next. Today's 4 Questions and streak rewards help you keep a daily habit. ■ COMPOSE Hum a melody or play music, and the app analyzes its melody, tempo and chords on your device and turns it into a song. Fix the notes, add lyrics and chords, play it with accompaniment, and save it as a video to Photos (MIDI, MusicXML and WAV export are supported too). ■ PLAYBACK Listen to the built-in songs (children's songs, classical, gospel, world folk, Christmas and more), each 1.5–3 minutes long, in genre playlists. Add your own compositions and play them like a music player. ■ PRIVATE BY DESIGN Your practice records and songs stay on your device. Audio from the microphone is analyzed on the device only. ■ PRICING Free to use with ads. Importing songs and exporting videos each take a short ad and are limited to once a day, and you can keep up to 3 songs you made. An in-app purchase removes ads and those limits, adds MIDI, MusicXML and WAV export, and lets you start quizzes at higher levels anytime (free players can unlock this for the day by watching an ad). The app's screens are available in Japanese, English, Chinese (Simplified and Traditional), Korean, French, German, Spanish, Italian and Portuguese; voices are in Japanese and English. Works in portrait and landscape on iPhone and iPad.