iDousyn vs CalmusPlay
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
iDousyn
This app transforms your device into a professional music production tool. It features a sample-based synthesizer with dual-layer sampling, advanced filters, and a professional effects chain. Create immersive sounds and build captivating tracks with an intuitive interface and extensive sound library.
- Dual-layer sampling
- Advanced filters and EQ
- Professional effects chain
- Creative chord pads
- MIDI mastery
- Expansive sound library
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iDousyn transforms your iPhone and iPad into a premium sampler, synthesizer, and AUv3 plugin built for professional music production, beat making, and sound design. Powered by a massive dual-layer rompler engine, it delivers a touch-optimized workflow to create studio-quality music anywhere. Seamlessly integrating as a high-performance AUv3 Audio Unit, iDousyn is the perfect companion for Logic Pro for iPad, GarageBand, Cubasis, AUM, Loopy Pro, and other leading iOS DAWs. Whether you are producing EDM, making hip hop beats, scoring cinematic soundtracks, or designing ambient soundscapes, iDousyn gives you the ultimate sonic palette. Chord Sequencer & Harmony Engine • Ultimate Inspiration: Instantly browse, audition, and map over 432 chord variations and 100 global musical scales directly to your pads—no advanced music theory required. • Timeline Sequencer: Drag and drop your custom chords into the new visual timeline. Program rests, set loop lengths, and let the zero-latency lookahead scheduler play your progressions with perfect tempo synchronization. • Dynamic Performance: 10 customizable Chord Pads featuring intelligent strumming, dual MIDI keyboards, and assignable key ranges with real-time Neon Glow visual feedback. Dual-Layer Synthesis & DSP Effects • True Dual-Layer Rompler: Stack and blend two independent sample oscillators. Fine-tune with octave, semitone, cents, pan, and level controls for massive, evolving textures. • Studio-Grade FX Chain: Shape your tone with multi-mode filters, a parametric EQ, and fully automatable AUv3 effects including Reverb, Delay, Chorus, Flanger, Phaser, Compressor, and Limiter. Massive Sound Library & iCloud Sync • 1,100+ Premium Samples: An expansive built-in soundbank featuring heavy basses, lush synth pads, sharp leads, drum kits, acoustic guitars, and orchestral strings. • Smart Presets: Create unlimited custom patches. Your library is safely backed up with automatic, silent background iCloud Drive synchronization across all your Apple devices. Pro Recording & Export • Lossless Audio & MIDI: Record your live sessions directly within the app and export high-fidelity FLAC, WAV, AIFF, CAF, or M4A audio files, as well as full MIDI sequences. • AudioShare Integration: Instantly route your bounces to your favorite audio editors. • Background Audio: Keep your sequences running and your MIDI controllers active even while switching between apps. Designed for modern producers, beat makers, live performers, and synth enthusiasts, iDousyn brings desktop-class virtual instruments right to your fingertips.
CalmusPlay
This app generates original, royalty-free music using artificial intelligence. Users can customize compositions by selecting elements like geographical origin, zodiac sign, interests, and desired speed. It's a simplified version of a desktop music composition program.
- AI music composition
- Royalty-free music
- Customizable music parameters
- Personalized music generation
- Simplified desktop version
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CalmusPlay - Your Personal Composer - composes music based on you... CalmusPlay composes original and royalty free music using Artificial Intelligence - Music for movies, TV shows or Games - and music for your self. The core of CalmusPlay is the CalmusAI brain where the modern composing methods are programmed into the brain using Lisp programming language. NASA has historically used Lisp for artificial intelligence and autonomous systems, most notably in the 1990s Remote Agent project, the first AI system to control a spacecraft. CalmusPlay does not collect or use any musical material from the internet but creates new music based on the input from the user. CalmusPlay can compose thousands of royalty free music examples by combining geographical position , zodiac sign, complexity, interests, colour and speed. How it works: Select your geographical origin, zodiac sign, personality complexity, interests, favourite colour, speed of your music and press Play … CalmusPlay is a simple versions of MacOs program CalmusComposer
Screenshots
Verdict
The clearest difference is rating: CalmusPlay at 5.0 against iDousyn's 4.2. CalmusPlay also leads on in-app purchases (none vs 1) and price ($2.99 vs $6.99). iDousyn's advantage is ratings volume (161 vs 2). On review sentiment, update cadence, 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
iDousyn costs $6.99 and CalmusPlay $2.99 up front. iDousyn sells 1 one-off in-app purchase. CalmusPlay asks for nothing beyond the download.
CalmusPlay holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: iDousyn has 161 ratings behind it against 2, so its average is the more settled of the two. Written reviews split almost evenly too, at 34% and 33% positive.
iDousyn ships an update every 2 months, CalmusPlay every 4 months. The most recent releases landed on October 24, 2026 and October 17, 2026 respectively.
| Parameter | iDousyn | CalmusPlay |
|---|---|---|
| Price | $6.99 | $2.99 — better |
| Rating | 4.2 (161 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 34.1% of reviews — better | 33.3% of reviews |
| Number of ratings | 161 — better | 2 |
| Update frequency | Every 2 months — better | Every 4 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 26.0 | 11.0 — better |
| Further details — not scored | ||
| Size | 1.2 GB | 291 MB |
| Age rating | 4+ | 4+ |
| Developer | Jorge Lozada | Erki-tonlist sf |
Customer experience
iDousyn
CalmusPlay
Bugs and requests
iDousyn
Reported bugs
15 issues- App crashes immediately
- Full version displays full-page ads
- Ads appear on the front page
- New update has ads
- Implemented trackers
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- iDousyn Lite works, this one does not
- App does not open
- MIDI input timing issues
- Sound crash sometimes
- Long delay between external MIDI and sound
- Sluggish keyboard
- Sluggish interface
- Glide is always on
- Scrolling menu is hard to use
- Sliders on scrolling menu
Requested features
10 requests- Adaptive Crasher (AUV3, Adaptive Cubasis and Zenbeats)
- AUV3 support
- Audiobus compatibility
- MIDI IN for better keyboard control
- Background audio option
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- Reset button
- Fix sound crash
- Improve interface contrast
- Make panel brighter
- Allow turning off glide
CalmusPlay
Not enough reviews yet to summarise bugs or requests.
In-app purchases
iDousyn
- Unlock ProFree
CalmusPlay
No in-app purchases









