# Caustic vs AudioKit FM Player 2

The clearest difference is price: AudioKit FM Player 2 at Free against Caustic's $9.99. AudioKit FM Player 2 also leads on rating (4.8 vs 3.5) and review sentiment (79% vs 58%). Caustic's advantage is in-app purchases (none vs 8) and ads (none vs shown).

AudioKit FM Player 2 is free to download; Caustic costs $9.99 up front. AudioKit FM Player 2 sells 8 in-app purchases, starting at $2.99 per 7 days. Caustic asks for nothing beyond the download.

AudioKit FM Player 2 holds the better App Store score, 4.8 against 3.5. That said, the two scores are not equally well evidenced: AudioKit FM Player 2 has 3.3K ratings behind it against 176, so its average is the more settled of the two. Written reviews point the same way: 58% of Caustic's written reviews are positive against 79% of AudioKit FM Player 2's.

Caustic ships an update every 4 months, AudioKit FM Player 2 monthly. Both last shipped on October 20, 2026.

## The numbers

| Metric | Caustic | AudioKit FM Player 2 |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | [3.5 (176 ratings)](https://appshunter.io/ios/app/caustic/id775735447/reviews) | **[4.8 (3.3K ratings)](https://appshunter.io/ios/app/audiokit-fm-player-2-dx-synth/id1307785646/reviews)** |
| Number of ratings | 176 | **3.3K** |
| Positive reviews | 57.8% of reviews | **79.1% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Monthly** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 52 MB | 357 MB |
| Requires iOS | **7.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Rejean Poirier](https://appshunter.io/developer/775735450) | [Audiobus Pty Ltd](https://appshunter.io/developer/672585101) |

## What reviewers say

### Caustic

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

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


### AudioKit FM Player 2

[App page](https://appshunter.io/ios/app/audiokit-fm-player-2-dx-synth/id1307785646)

This app offers a classic 80s FM synth experience with a vast library of sounds, effects, and sequencing capabilities. It's designed for musicians and producers to explore award-winning tones and create music on their iPad.

**Highlights:** Classic 80s FM Synth, EP, and FM Tine sounds, Multi-sampled recordings of famous classic presets, Stand-alone, IAA & Audiobus, AUv3 support, Vintage Arp & 16-Step Sequencer, 200+ presets and 150+ multi-sampled PCMs, Vintage Stereo Phaser, Chorus, Flanger, Amp Simulator, MIDI in for keyboard control

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly premium | $2.99 | per 7 days |
| Weekly premium | $2.99 | per 7 days |
| Weekly premium | $4.99 | per 7 days |
| Weekly premium | $4.99 | per 7 days |
| Yearly premium | $9.99 | per year |
| Weekly premium | $9.99 | per year |
| Yearly premium | $29.99 | per year |
| Yearly premium | $29.99 | per year |

**What reviewers like**

- 🎹 Excellent DX7 emulation
- 👍 Easy to use interface
- 💯 Fantastic sound quality
- 🎨 Highly customizable
- 🔊 Great effects and filters

**What reviewers complain about**

- 🐛 Crashes and stability issues
- 🔌 Battery drain problems
- 🔇 Occasional audio glitches
- 🤔 Compatibility issues with some DAWs

**Reported bugs**

- Crashes when switching presets
- Midi playback not working consistently
- Preset loading issues in some DAWs

**Requested features**

- Arpeggiator/sequencer functionality
- Ability to save and load custom presets
- Improved MIDI integration and mapping
- Expanded sound library and more DX-style presets


## Frequently asked questions

### Is Caustic free?

Caustic costs $9.99, with no in-app purchases.

### Is AudioKit FM Player 2 free?

AudioKit FM Player 2 is free to download, with in-app purchases available.

### Which has better reviews, Caustic or AudioKit FM Player 2?

AudioKit FM Player 2 is rated higher. Caustic averages 3.5 out of 5 from 176 ratings, while AudioKit FM Player 2 averages 4.8 from 3.3K ratings.

### Do Caustic or AudioKit FM Player 2 have ads?

AudioKit FM Player 2 shows ads; Caustic does not.

### Which is updated more often, Caustic or AudioKit FM Player 2?

Caustic ships an update every 4 months, and AudioKit FM Player 2 monthly. Most recently, Caustic was updated on October 20, 2026 and AudioKit FM Player 2 on October 20, 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.*