Comparison

iDousyn vs Caustic

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Dual-layer sampling
  • Advanced filters and EQ
  • Professional effects chain
  • Creative chord pads
  • MIDI mastery
  • Expansive sound library
Features
Read full description

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.

About

Caustic

Create music with a virtual synthesizer and sampler rig. Build your sound by adding up to 14 machines, including synths and drum machines. Features a mixer, effects, and a song sequencer for real-time audio production.

Highlights
  • Virtual analog subtractive synthesizer
  • Multi-sample wave synthesizer
  • Sampling drum machine
  • Effects rack with 20 effect types
  • Mixer desk with EQ and effects
  • Song sequencer
  • AudioBus and AudioCopy/Paste support
Features
Currently charting
Read full description

Caustic 3 is a music creation tool inspired by rack-mount synthesizer/sampler rigs. Everything is real-time and optimized for mobile devices. Create your rack by adding up to 14 machines from a choice of: * Subsynth - Virtual analog subtractive synthesizer * PCMSynth - Multi-sample wave synthesizer * BassLine - 303-like monosynth * BeatBox - 8-channel sampling drum machine * PadSynth - Harmonic table pad synthesizer * 8BitSynth - 8bit equation solver synthesizer * Modular - Fully configurable and routable synthesizer * Organ - Tonewheel organ with rotary speaker * Vocoder - 8-band harmonic vocoder * FMSynth - DX-style 3-operator fm synthesizer * KSSynth - Karplus-Strong string modeling synthesizer * SawSynth - Supersaw-type synthesizer The app also includes: * Effects rack supporting 2 effects per machine (20 effect types). * Mixer desk with EQ, panning and global Delay/Reverb effects. * Master section with effect slots, parametric EQ and limiter. * Song sequencer AudioBus support for Input and Output slots. AudioCopy Paste + AudioShare support for import and export. Supports automation recording on most controls and includes powerful editors for modifying automation curves. Users can record their own WAV files for use in the PCMSynth, BeatBox, and Vocoder or import files through iTunes file sharing, ACP, AudioShare, or the built-in FTP server. Supports all uncompressed WAV files (8-16-24-32bit, any sampling rate). The PCMSynth can also load SoundFont files (.sf2), SFZ and FL/Xewton instruments (.instr, .ZIP) "Open In.." import support for all preset types, .WAV, .SF2 and .MID. (MIDI (.mid) files can be imported as raw sequencer note data.) Supports CoreMIDI and virtual MIDI for note, velocity and CC data. (be sure to set "Enable background audio" in advanced options to use virtual MIDI) See the in-app help section for dozens of informative tutorial videos and full online manual. There is also a FREE (full version) PC/Mac version available for download on the product website. Come visit www.singlecellsoftware.com to download more presets, request features, share your tracks and hear what others are creating with Caustic 3. Works on iPhone/iPod but iPad is recommended.

Screenshots

iDousyn4 screens
Caustic4 screens

Verdict

The call

The clearest difference is rating: iDousyn at 4.2 against Caustic's 3.5. Caustic's advantage is in-app purchases (none vs 1) and review sentiment (58% vs 34%). On price, ratings volume, update cadence and ads 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

CostPrice · In-app purchases · Ads · Monetization

iDousyn costs $9.99 and Caustic $9.99 up front. iDousyn sells 1 one-off in-app purchase. Caustic asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

iDousyn holds the better App Store score, 4.2 against 3.5. Both are backed by a comparable volume of ratings — 159 and 176 respectively. Written reviews complicate that: 34% of iDousyn's written reviews are positive against 58% of Caustic's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

iDousyn ships an update every 2 months, Caustic every 4 months. The most recent releases landed on October 13, 2026 and October 12, 2026 respectively.

Scorecard6 real differences · 5 level
iDousyn versus Caustic: the parameters behind the verdict, then further details
ParameteriDousynCaustic
Price$9.99$9.99
Rating4.2 (159 ratings) — better3.5 (176 ratings)
Positive reviews34.1% of reviews57.8% of reviews — better
Number of ratings159176 — better
Update frequencyEvery 2 months — betterEvery 4 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
Best chart rank—#138 — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS26.07.0 — better
Further details — not scored
Size1.2 GB52 MB
Age rating4+4+
DeveloperJorge LozadaRejean Poirier

Customer experience

iDousyn

All ratings159 ratings
Positive78.6%
Neutral2.5%
Negative18.9%
Written reviews44 reviews
Positive34.1%
Neutral6.8%
Negative59.1%

Caustic

All ratings176 ratings
Positive60.2%
Neutral8.5%
Negative31.3%
Written reviews218 reviews
Positive57.8%
Neutral7.8%
Negative34.4%

Bugs and requests

iDousyn

Not enough reviews yet to summarise bugs or requests.

Caustic

Reported bugs

3 issues
  • Crashes and freezes on newer iPhones
  • Interface scaling problems on larger screens
  • Unresponsive controls in certain scenarios

Requested features

4 requests
  • Bluetooth audio support
  • Improved file management and export options
  • More synth/instrument options
  • Expanded effects and mixing capabilities

In-app purchases

1 purchases

iDousyn

One-time1
  • Unlock ProFree
None

Caustic

No in-app purchases

Questions

Is iDousyn free?
iDousyn costs $9.99, and also offers in-app purchases.
Is Caustic free?
Caustic costs $9.99, with no in-app purchases.
Which has better reviews, iDousyn or Caustic?
iDousyn is rated higher. iDousyn averages 4.2 out of 5 from 159 ratings, while Caustic averages 3.5 from 176 ratings.
Do iDousyn or Caustic have ads?
Neither iDousyn nor Caustic shows ads.
Which is updated more often, iDousyn or Caustic?
iDousyn ships an update every 2 months, and Caustic every 4 months. Most recently, iDousyn was updated on October 13, 2026 and Caustic on October 12, 2026.

Other comparisons