# Zeeon synth vs OB

The clearest difference is in-app purchases: OB at none against Zeeon synth's 3. Zeeon synth's advantage is rating (4.8 vs 4.3) and review sentiment (76% vs 57%). On price, update cadence, ads and device support there is nothing between them.

Zeeon synth costs $14.99 and OB $14.99 up front. Zeeon synth sells 3 one-off in-app purchases. OB asks for nothing beyond the download.

Zeeon synth holds the better App Store score, 4.8 against 4.3. Both are backed by a comparable volume of ratings — 209 and 64 respectively. Written reviews point the same way: 76% of Zeeon synth's written reviews are positive against 57% of OB's.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Zeeon synth | OB |
| --- | --- | --- |
| Price | $14.99 | $14.99 |
| Rating | **[4.8 (209 ratings)](https://appshunter.io/ios/app/zeeon-synth/id1230960440/reviews)** | [4.3 (64 ratings)](https://appshunter.io/ios/app/ob-xd-auv3-synth/id1465262829/reviews) |
| Number of ratings | **209** | 64 |
| Positive reviews | **76.0% of reviews** | 57.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 27 MB | 25 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [BeepStreet](https://appshunter.io/developer/321412321) | [DiscoDSP LLC](https://appshunter.io/developer/1465262828) |

## What reviewers say

### Zeeon synth

[App page](https://appshunter.io/ios/app/zeeon-synth/id1230960440)

This app is a virtual analog synthesizer that recreates the sound and feel of classic hardware. It features a detailed circuit-modeling engine, powerful modulation, and multiple filter models for rich, organic soundscapes. Explore a vast array of presets and expand your sonic palette with additional sound banks.

**Highlights:** Circuit-modeling engine, Powerful modulation matrix, Dual oscillators with variable waveforms, Multiple filter models, Built-in effects unit, Audio Unit v3 support, Polyphonic step sequencer

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OI - Exploration Vol. 1 | $3.99 | one-time |
| BB Z-Space | $4.99 | one-time |
| BB Synthwave | $4.99 | one-time |

**What reviewers like**

- 🎨 Excellent sound quality
- 🎹 Intuitive and well-designed interface
- 🔧 Flexible and deep sound design capabilities
- 💻 Seamless integration as an AUv3 plugin
- 🎚️ Smooth and responsive controls

**What reviewers complain about**

- 🐛 Stability issues, crashes on some devices
- 🔌 Compatibility problems with newer iOS versions
- 📂 Preset management could be improved
- 🔀 Lack of MIDI learn and sequencer features
- 🖥️ UI scaling issues on larger iPad displays

**Reported bugs**

- Preset settings not retained after app restart
- Synth reverts to default settings when reopening Logic Pro project
- Crashes and freezes on certain iOS 14+ devices
- Inability to access in-app purchases from within the app

**Requested features**

- Add MIDI learn functionality
- Implement a more robust preset management system
- Include a built-in sequencer with save/load capabilities
- Improve UI scaling and layout for larger iPad screens
- Provide better integration with inter-app audio and Audiobus


### OB

[App page](https://appshunter.io/ios/app/ob-xd-auv3-synth/id1465262829)

This app emulates the classic Oberheim OB-X synthesizer, offering its rich sound and behavior with added enhancements. It focuses on sonic quality and includes micro random detuning for authentic analog warmth. External effects are recommended to further shape its versatile soundscapes.

**Highlights:** Oberheim OB-X emulation, Recreates original sound and behavior, Added enhancements to original design, Micro random detuning, Rich and good sound quality

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 🎶 Incredible sound quality
- ✨ Inspiring creative tool
- 🎹 Faithful emulation of classic synth
- 🎛️ Great for programming
- 🎚️ Useful presets

**What reviewers complain about**

- 🐛 Unusable UI on older devices
- 💻 Poor GUI scaling on iPad Pro
- 🎛️ Controls unresponsive or misaligned
- 📉 Limited functionality without updates
- 🤷‍♂️ No clear upgrade path

**Reported bugs**

- Crashes in Audiobus
- Cannot use in MIDI section of Audiobus
- Preset browser issues (scrolling, cut off banks)
- Automation bug with cutoff freq
- UI issues on iPad Pro (buttons misaligned, text cut off)

**Requested features**

- Add last/high priority for mono patches
- Increase polyphony to 8 voices
- MIDI Learn functionality
- Preset browser improvements (categories, scrolling)
- Adjustable keyboard size


## Frequently asked questions

### Is Zeeon synth free?

Zeeon synth costs $14.99, and also offers in-app purchases.

### Is OB free?

OB costs $14.99, with no in-app purchases.

### Which has better reviews, Zeeon synth or OB?

Zeeon synth is rated higher. Zeeon synth averages 4.8 out of 5 from 209 ratings, while OB averages 4.3 from 64 ratings.

### Do Zeeon synth or OB have ads?

Neither Zeeon synth nor OB shows ads.

### Which is updated more often, Zeeon synth or OB?

Zeeon synth ships an update every 2 months, and OB every 2 months. Most recently, Zeeon synth was updated on October 24, 2026 and OB on October 25, 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.*