# iProphet Synthesizer vs OB

The clearest difference is rating: OB at 4.4 against iProphet Synthesizer's 3.6. OB also leads on review sentiment (57% vs 34%) and update cadence (every 2 months vs every 5 months). iProphet Synthesizer's advantage is price ($9.99 vs $14.99) and iOS requirement (8.0 vs 15.0). On ratings volume, ads and in-app purchases there is nothing between them.

iProphet Synthesizer costs $9.99 and OB $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

OB holds the better App Store score, 4.4 against 3.6. Both are backed by a comparable volume of ratings — 32 and 65 respectively. Written reviews point the same way: 34% of iProphet Synthesizer's written reviews are positive against 57% of OB's.

iProphet Synthesizer ships an update every 5 months, OB every 2 months. The most recent releases landed on October 19, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | iProphet Synthesizer | OB |
| --- | --- | --- |
| Price | **$9.99** | $14.99 |
| Rating | [3.6 (32 ratings)](https://appshunter.io/ios/app/iprophet-synthesizer/id898449685/reviews) | **[4.4 (65 ratings)](https://appshunter.io/ios/app/ob-xd-auv3-synth/id1465262829/reviews)** |
| Number of ratings | 32 | **65** |
| Positive reviews | 34.0% of reviews | **57.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 months** |
| Monetization | Paid | **Free** |
| Size | 85 MB | 25 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Arturia](https://appshunter.io/developer/549089551) | [DiscoDSP LLC](https://appshunter.io/developer/1465262828) |

## What reviewers say

### iProphet Synthesizer

[App page](https://appshunter.io/ios/app/iprophet-synthesizer/id898449685)

This app emulates the classic Sequential Circuits Prophet VS synthesizer, offering its unique digital sound. Sculpt sounds with four digital oscillators, a multimode filter, and extensive modulation options. It includes over 500 presets and integrates with other music production tools.

**Highlights:** Vector screen with joysticks, Modulation Matrix, 3 DSP effects, 96 waveforms, 4 filter types, Vector envelope, Unison/detune

**In-app purchases:** none

**What reviewers like**

- 🎵 Authentic Prophet VS sound quality and character
- 🎹 Deep modulation matrix with vector synthesis capabilities
- 🎚️ Extensive preset library with diverse sounds
- 🎨 Intuitive visual interface and design
- 💰 Affordable price point for feature set

**What reviewers complain about**

- 🐛 Persistent audio distortion and crackling issues
- 🐛 Frequent crashes and app freezes
- 🔌 Poor inter-app audio (IAA) and Audiobus integration
- 🔋 Excessive battery drain in background
- ⚠️ Abandoned by developer with no updates

**Reported bugs**

- Audio distortion and crackling in all presets
- App crashes on iOS 14+ versions
- Inter-app audio (IAA) connection requires multiple restarts
- Preset changes cause app freezes and audio cutouts
- Stuck and hanging notes when sliding on keyboard

**Requested features**

- AUv3 plugin support for Logic Pro and other DAWs
- Ability to save custom patches and presets
- Velocity and aftertouch MIDI support
- MIDI control for joystick parameter
- User-defined waveform creation


### 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 iProphet Synthesizer free?

iProphet Synthesizer costs $9.99, with no in-app purchases.

### Is OB free?

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

### Which has better reviews, iProphet Synthesizer or OB?

OB is rated higher. iProphet Synthesizer averages 3.6 out of 5 from 32 ratings, while OB averages 4.4 from 65 ratings.

### Do iProphet Synthesizer or OB have ads?

Neither iProphet Synthesizer nor OB shows ads.

### Which is updated more often, iProphet Synthesizer or OB?

iProphet Synthesizer ships an update every 5 months, and OB every 2 months. Most recently, iProphet Synthesizer was updated on October 19, 2026 and OB on October 22, 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.*