Audulus 4 vs Piano Chord Practice
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Audulus 4
Create and shape sounds with a professional-grade modular synthesizer environment. Explore a vast library of modules for synthesis and sound design, with the option to expand your toolkit with premium instruments and effects. Available across Apple devices for seamless workflow.
- Modular synthesizer environment
- Sound design tools
- Real-time audio shaping
- Extensive module library
- Premium Pro Modules (in-app purchases)
- Cross-device iCloud sync
- AUv3 plugin support
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Build synthesizers. Design sounds. Shape audio in real time. All with professional-grade, low-latency performance ready for live use — and it’s free. Audulus gives you a complete modular environment at no cost. Its clean, fluid interface stays out of the way so you can focus on what matters: exploring sound. A modular playground with room to grow — from first experiments to advanced designs. Looking for more? Discover the Pro Module series: premium instruments and effects that show what’s possible when world-class sound design meets true modular freedom. Each Pro Module is crafted specifically for Audulus, giving you new ways to expand your sonic toolkit. Available on iPhone, iPad, and Mac — your modular system travels with you. ▶ What People Are Saying: "gem for Apple platforms – gorgeous, fluid" — Peter Kirn, createdigitalmusic.com "stunning!" — Richard Devine, devinesound.net "Remarkable gesture control" — sequencer.de ▶ Join our forum and Discord community! ▶ What You Get: • Complete modular environment — free to download and explore • Pro Module series — premium modules available as in-app purchases • Available on iPhone, iPad, and Mac with iCloud sync • Standalone app or AUv3 plugin • Deep node library for building from scratch • Extensive module library for synthesis and sound design • Multi-channel signal flow for polyphony and complex routing • Next-gen multi-core audio processing • Smooth, high-performance graphics even with massive patches • MIDI I/O with MIDI learn • GLSL shader node for creating advanced visuals • Lua scripting for custom DSP and vector graphics Terms of Use: https://audulus.com/terms.html
Piano Chord Practice
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A chord practice app designed to make learning piano chords fun. It is made for people who know chord names but cannot quickly play them on the keyboard, or who want to practice not only major and minor chords, but also 7th, 9th, sus, dim, and aug chords. In Practice Mode, you can focus on a wide range of chord types, including major, minor, 7th, sus, dim, aug, 9th, 11th, and 13th chords. In Chord Progression Mode, you can challenge yourself with genre-based progressions such as Pops, Rock, Jazz, R&B, HipHop, House, Lo-Fi, and Future Bass. MIDI keyboards are supported, so you can practice using either the on-screen keyboard or a real keyboard. Learn chord shapes and sounds in a game-like way while checking correct and incorrect answers. A MIDI device is recommended for this app. Available in English and Japanese.
Screenshots
Verdict
The clearest difference is price: Audulus 4 at Free against Piano Chord Practice's $2.99. Audulus 4 also leads on iOS requirement (18.0 vs 26.0). Piano Chord Practice's advantage is in-app purchases (none vs 10) and update cadence (every 5 days vs monthly). On ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Audulus 4 is free to download; Piano Chord Practice costs $2.99 up front. Audulus 4 sells 10 one-off in-app purchases. Piano Chord Practice asks for nothing beyond the download.
Audulus 4 ships an update monthly, Piano Chord Practice every 5 days. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.
| Parameter | Audulus 4 | Piano Chord Practice |
|---|---|---|
| Price | Free — better | $2.99 |
| Rating | 4.3 (73 ratings) — better | — |
| Positive reviews | 69.2% of reviews | — |
| Number of ratings | 73 — better | — |
| Update frequency | Monthly | Every 5 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, Mac — better | iPhone, iPad |
| Requires iOS | 18.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 103 MB | 210 MB |
| Age rating | 4+ | 4+ |
| Developer | Audulus LLC | yuji yoshie |
Bugs and requests
Audulus 4
Reported bugs
13 issues- iOS 18 compatibility issues (app not working)
- Save presets but no 'Load' button
- Undo command issues with DAWs
- CMD+Z causing data loss
- Opt+drag not duplicating modules
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- Plugin window not resizable
- Menu filtering not functioning properly on iPhone
- Select and Import buttons not working
- Blank screen on open
- App freezes on iPad Pro
- Black screen on launch after update
- No modules appearing after iOS 18 update
- Patches not appearing after iOS 18 update
Requested features
7 requests- Add 'Load' button for presets
- Improve DAW integration (Undo, duplicate)
- Resizable plugin window
- More modules (FFT/IFFT, granular buffering)
- Add CC in module
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- Sync to host as AUv3
- Make upgrade path clearer from Audulus 3
Piano Chord Practice
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Audulus 4
- 1-shot Sample$1.99
- CG-1 Chord Generator$3.99
- J-23 Reverb$7.99
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- ARP-1$7.99
- CPR-3$7.99
- SynD-K1$7.99
- TRIKOR VCO$9.99
- CLK Tools Bundle$9.99
- Essential Synth Bundle$9.99
- VCF Bundle 1$9.99
Piano Chord Practice
No in-app purchases
Questions
Is Audulus 4 free?
Is Piano Chord Practice free?
Do Audulus 4 or Piano Chord Practice have ads?
Which is updated more often, Audulus 4 or Piano Chord Practice?
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