iDousyn vs Spectrum Synthesizer Bundle
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.
Spectrum Synthesizer Bundle
This app provides a bundle of four professional audio unit synthesizers and one effect, inspired by popular eurorack modules. Explore diverse sound design possibilities with multi-mode oscillators, modal synthesis, string generation, and granular sampling. Compatible with DAWs and AU hosts for creative music production.
- Multi-mode polyphonic oscillator
- Modal synthesis
- String generation algorithms
- Granular sampler and looper
- Modulation LFO and ADSR envelope
- XY touchpad and modulation matrix
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Spectrum is a collection of 3 Audio Unit synthesizers and one Audio Unit effect. Spectrum is based on popular eurorack synthesizer modules made by Mutable Instruments. Included are four audio units: Spectrum - Multi-mode 8-voice polyphonic oscillator featuring 14 high quality oscillator algorithms. Supports MPE. Modal - Modal synthesis. Bowed, Blowed, and Struck sounds through a 64-band resonator. Also included as an effect. Resonator - 7 beautiful string generation algorithms. Also included as an effect Granular - Granular sampler, looper, pitch shifter, reverb effect. Note that Granular is an Audio Unit effect, not an instrument, so it goes in an effect slot. To use Spectrum, load the Audio Units in your DAW or AU host of choice, like Audiobus, GarageBand or AUM. Each audiounit also features: - modulation LFO featuring tempo sync, key reset, reset phase adjustment - modulation ADSR envelope - XY touchpad (except on Modal) - 2-source modulation matrix allowing for complex and evolving patches. - MIDI CC control of parameters - Resonator and Modal are also loadable as an AudioUnit effect Spectrum contains DSP code provided under the MIT open source license by Mutable Instruments.
Screenshots
Verdict
The clearest difference is review sentiment: Spectrum Synthesizer Bundle at 93% against iDousyn's 34%. Spectrum Synthesizer Bundle also leads on price (Free vs $9.99) and rating (4.8 vs 4.2). On ratings volume, 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
Spectrum Synthesizer Bundle is free to download; iDousyn costs $9.99 up front. iDousyn sells 1 one-off in-app purchase. Spectrum Synthesizer Bundle asks for nothing beyond the download.
Spectrum Synthesizer Bundle holds the better App Store score, 4.8 against 4.2. Both are backed by a comparable volume of ratings — 159 and 135 respectively. Written reviews point the same way: 34% of iDousyn's written reviews are positive against 93% of Spectrum Synthesizer Bundle's.
iDousyn ships an update every 2 months, Spectrum Synthesizer Bundle every 4 weeks. The most recent releases landed on October 13, 2026 and October 16, 2026 respectively.
| Parameter | iDousyn | Spectrum Synthesizer Bundle |
|---|---|---|
| Price | $9.99 | Free — better |
| Rating | 4.2 (159 ratings) | 4.8 (135 ratings) — better |
| Positive reviews | 34.1% of reviews | 92.9% of reviews — better |
| Number of ratings | 159 — better | 135 |
| Update frequency | Every 2 months | Every 4 weeks — better |
| 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 | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | Jorge Lozada | Thomas Burns |
Customer experience
iDousyn
Spectrum Synthesizer Bundle
Bugs and requests
iDousyn
Not enough reviews yet to summarise bugs or requests.
Spectrum Synthesizer Bundle
Reported bugs
7 issues- Crashes more than it should
- Modal synthesizer doesn't work on its own
- Creates massive feedback on macOS
- Songs won't export from GarageBand iOS when plugin is enabled
- Lots of crashes since previous update
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- Formatting is horrible on GarageBand, can't see most parameters
- Granular only shows up in Audiobus3, but can't be launched
Requested features
6 requests- Bring back granular synth or remove from description
- Create a standalone version
- Bring back old UI as an option
- Advanced version with standalone apps, proper GUI, and extensive modulation/control
- More Mutable ports (Ripples, Stages)
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- Original Rings in 1 voice/modal mode for bass synth
In-app purchases
iDousyn
- Unlock ProFree
Spectrum Synthesizer Bundle
No in-app purchases
Questions
Is iDousyn free?
Is Spectrum Synthesizer Bundle free?
Which has better reviews, iDousyn or Spectrum Synthesizer Bundle?
Do iDousyn or Spectrum Synthesizer Bundle have ads?
Which is updated more often, iDousyn or Spectrum Synthesizer Bundle?
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