midiOS vs RS
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
midiOS
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Before installing, visit midios.app/setup for setup instructions. midiOS is a new kind of instrument. Transform your iPhone into an expressive MIDI instrument with advanced harmony, multidimensional performance control, and deep DAW integration. Play notes, chords, scales, arpeggios, modulation, and complete live performances from the device you already carry. With Offline Play, midiOS becomes a self-contained instrument. Choose from built-in sounds, create an instrument rack, record or import personal samples, and capture performances in Offline LiveGridβwithout a Mac, DAW, account, or network connection. Designed for musicians, midiOS opens ready to perform. Tap pads to play notes, chords, and scales. Change keys, modes, voicings, and tonal centers without interrupting your flow. Swipe across pads to explore inversions, chord qualities, suspensions, secondary dominants, chromatic movement, and harmonic variations. Every gesture can become musical. Shape your performance with multi-touch, directional gestures, device motion, aftertouch, pitch movement, XY pads, sliders, knobs, and macros. Optional facial controls let head and expression movements influence harmony, modulation, register, and other performance destinations in real time. Performance Modes transform these inputs into coordinated musical systems. Intelligent voice leading keeps chords connected, expressive harmony controls create fluid transitions, and synchronized arpeggiation follows your DAWβs tempo and phase without restarting the pattern. Built-in modes provide focused setups for piano performance, harmony exploration, musical learning, generative flow, and Ableton control, while Custom Mode lets you create your own instrument. Save complete instruments and performance setups in the Layout Library, then switch between them quickly. Discover and install compatible instruments through the midiOS Marketplace, or transfer your own layouts securely between midiOS and the midiOS Bridge. Using the free midiOS Bridge for Mac, connect over USB or Wi-Fi for a fast, authenticated MIDI connection to your computer. midiOS works with MIDI-compatible software and offers deep Ableton Live integration, including clip and scene launching, transport, session navigation, mixer controls, macros, and real-time visual feedback on your iPhone. Rotate your device to enter LiveGrid and transform your iPhone into a live performance controller. Launch clips and scenes, navigate your session, control transport, and manage your performance from across the stage or studio. Built for live performance, midiOS combines responsive MIDI, intelligent harmony, stable note ownership, fast layout switching, haptic feedback, visual feedback, and automatic reconnection in a workflow designed to keep you focused on making music. Most MIDI apps give you buttons. midiOS gives you an instrument that responds to how you play. Learn more at midios.app.
RS
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Unleash the full voice of your choir. RS-CHOIR is the ultimate companion app designed exclusively for the Teenage Engineering Choir. Whether you are a composer, producer, or live performer, RS-CHOIR equips you with powerful tools to compose, sequence, loop, and harmonize in real-time. Transform your choir into a fully customizable vocal ensemble with four intuitive modes and advanced synchronization features. FOUR POWERFUL MODES ****Loop & Edit: Play your choir using a multi-octave virtual keyboard. Capture your inspiration with four dedicated recording loops to build complex, layered harmonies. Need perfection? Use the manual note editor to fine-tune the pitch and length of any note until it perfectly fits your vision. ****Sequence: Arrange complete, evolving song structures by chaining up to 16 unique patterns. Define single notes or full chords for every step. Donβt just play notesβplay words! Assign specific vowels and consonants to craft custom lyrics and vocal articulations. ****Sing: Turn your Choir into your personal backup singers. Simply tap to latch your microphone, sing a tone, and listen as the Choir seamlessly harmonizes with you in real-time. ****Play: Effortlessly save your compositions and play whenever you want. You can also load MP3 backing tracks that play in perfect parallel with your choir, giving you a massive, full-band sound. ADVANCED PRO FEATURES Native Gear Sync: RS-CHOIR isn't just an isolated app. Send an audio master clock sync pulse directly from your device to perfectly time your Choir with external gear, including Teenage Engineering Pocket Operators, modular synths, and other grooveboxes. AI Song Generation: Generate entirely new songs in seconds! Use our built-in AI workflow and optimized prompts with your favorite AI chat to generate fresh song data. Paste it back into the app, and your Choir will sing a brand-new, original piece. Full Vocal Integration: Bring your choir to the next level. Move beyond simple melodies by adding dedicated vocals and articulations to your masterpieces. Ready to start conducting? Download RS-CHOIR today and bring your vocal arrangements to life. Disclaimer: RS-CHOIR is an independently developed application and is not affiliated with, associated with, or endorsed by Teenage Engineering.
Screenshots
Verdict
The clearest difference is price: RS at Free against midiOS's $24.99. RS also leads on iOS requirement (18.6 vs 26.0). midiOS's advantage is in-app purchases (none vs 3). On update cadence, ads and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
RS is free to download; midiOS costs $24.99 up front. RS sells 3 one-off in-app purchases. midiOS asks for nothing beyond the download.
midiOS ships an update every 3 days, RS every 4 days. The most recent releases landed on October 9, 2026 and October 7, 2026 respectively.
| Parameter | midiOS | RS |
|---|---|---|
| Price | $24.99 | Free β better |
| Update frequency | Every 3 days β better | Every 4 days |
| Ads | No | No |
| In-app purchases | No β better | Yes |
| Devices | iPhone | iPhone, iPad β better |
| Requires iOS | 26.0 | 18.6 β better |
| Further details β not scored | ||
| Size | 341 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | jason merrill | Rolf Schmucker |
In-app purchases
midiOS
No in-app purchases
RS
- Creator Version$4.99
- Creator Version$8.99
- Creator Version$14.99









