# iDousyn vs Caustic

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.

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.

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.

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.

## The numbers

| Metric | iDousyn | Caustic |
| --- | --- | --- |
| Price | $9.99 | $9.99 |
| Rating | **[4.2 (159 ratings)](https://appshunter.io/ios/app/idousyn/id421852860/reviews)** | [3.5 (176 ratings)](https://appshunter.io/ios/app/caustic/id775735447/reviews) |
| Number of ratings | 159 | **176** |
| Positive reviews | 34.1% of reviews | **57.8% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 4 months |
| Monetization | **Free with in-app purchases** | Paid |
| Best chart rank | — | **#157** |
| Size | 1.2 GB | 52 MB |
| Requires iOS | 26.0 | **7.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Jorge Lozada](https://appshunter.io/developer/421852863) | [Rejean Poirier](https://appshunter.io/developer/775735450) |

## What reviewers say

### iDousyn

[App page](https://appshunter.io/ios/app/idousyn/id421852860)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Pro | Free | one-time |


### Caustic

[App page](https://appshunter.io/ios/app/caustic/id775735447)

**Currently charting:** #157 Top Paid · Music (US App Store)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Powerful and feature-rich
- 👍 Intuitive workflow
- 🎨 Excellent sound quality
- 💸 Great value for money

**What reviewers complain about**

- 🐛 Compatibility issues with newer iOS versions
- 🔇 No Bluetooth audio support
- 📁 Difficulty accessing/exporting files
- 🔧 Needs more updates and bug fixes

**Reported bugs**

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

**Requested features**

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


## Frequently asked 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.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*