# ARP ODYSSEi vs Hilda Synthesizer

The clearest difference is price: Hilda Synthesizer at $12.99 against ARP ODYSSEi's $29.99. Hilda Synthesizer also leads on in-app purchases (none vs 2) and update cadence (every 9 days vs every 8 months). ARP ODYSSEi's advantage is chart position (#151 vs unranked) and iOS requirement (9.3 vs 12). On ads and device support there is nothing between them.

ARP ODYSSEi costs $29.99 and Hilda Synthesizer $12.99 up front. ARP ODYSSEi sells 2 one-off in-app purchases. Hilda Synthesizer asks for nothing beyond the download.

ARP ODYSSEi ships an update every 8 months, Hilda Synthesizer every 9 days. The most recent releases landed on November 1, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | ARP ODYSSEi | Hilda Synthesizer |
| --- | --- | --- |
| Price | $29.99 | **$12.99** |
| Rating | **[4.6 (336 ratings)](https://appshunter.io/ios/app/arp-odyssei/id1147432809/reviews)** | — |
| Number of ratings | **336** | — |
| Positive reviews | 64.9% of reviews | **90.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 9 days** |
| Monetization | **Free with in-app purchases** | Paid |
| Best chart rank | **#151** | — |
| Size | 222 MB | 6 MB |
| Requires iOS | **9.3** | 12 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [KORG INC.](https://appshunter.io/developer/363714046) | [Bram Bos](https://appshunter.io/developer/325340444) |

## What reviewers say

### ARP ODYSSEi

[App page](https://appshunter.io/ios/app/arp-odyssei/id1147432809)

**Currently charting:** #151 Top Paid · Music (US App Store)

Experience the iconic ARP analog synthesizer sound on your mobile device. This app faithfully reproduces the classic hardware with enhanced features like polyphony and built-in effects. Explore new sonic possibilities with its advanced arpeggiator and optional design revisions.

**Highlights:** Faithful circuit modeling of ARP ODYSSEY, Polyphony and chord playing, Programmable step sequencer arpeggiator, Built-in effects, Optional design revisions (Rev1, Rev2, Rev3), Integration with KORG Gadget

**Features:** Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Odyssey Rev1 | $4.99 | one-time |
| Odyssey Rev2 | $4.99 | one-time |

**What reviewers like**

- 🎨 Faithful recreation of the original ARP Odyssey
- 👍 Great sound quality and accurate emulation
- 🎹 Polyphonic and duophonic capabilities
- 🔊 Impressive built-in effects and sequencer
- 💻 Works well as a standalone app and within Gadget

**What reviewers complain about**

- 🔧 Lack of MIDI implementation (no program change, MIDI learn)
- 🔀 Issues with tuning and pitch tracking, especially in Gadget
- 🔒 No AUv3 support, limiting integration with other apps
- 📱 Small controls and interface can be difficult on smaller devices
- 🔋 CPU-intensive, causing performance issues on some devices

**Reported bugs**

- Crashes when trying to import user presets
- Disappearing sound issues
- Arpeggiator not working correctly within Gadget

**Requested features**

- Add AUv3 support for better DAW integration
- Implement MIDI learn and program change functionality
- Improve tuning and pitch tracking, especially in Gadget
- Optimize performance and reduce CPU usage
- Provide larger UI controls and better support for larger iPad screens


### Hilda Synthesizer

[App page](https://appshunter.io/ios/app/hilda-synthesizer/id6447191659)

This app offers a complex oscillator monosynth with a blend of west-coast and east-coast synthesis techniques. It features a wave folder, lowpass gate, 12-mode filter, and VCA circuit, all meticulously circuit-modelled for authentic analog or digital sound. It functions as a playable synth, MIDI sequencer, and audio effect.

**Highlights:** Complex Oscillator Monosynth, Wave folder and lowpass gate, 12-mode filter, Circuit-modelled analog sound, Built-in 16-step MIDI Sequencer, Audio effect for external audio, AUv3 compatibility

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is ARP ODYSSEi free?

ARP ODYSSEi costs $29.99, and also offers in-app purchases.

### Is Hilda Synthesizer free?

Hilda Synthesizer costs $12.99, with no in-app purchases.

### Do ARP ODYSSEi or Hilda Synthesizer have ads?

Neither ARP ODYSSEi nor Hilda Synthesizer shows ads.

### Which is updated more often, ARP ODYSSEi or Hilda Synthesizer?

ARP ODYSSEi ships an update every 8 months, and Hilda Synthesizer every 9 days. Most recently, ARP ODYSSEi was updated on November 1, 2026 and Hilda Synthesizer on October 30, 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.*