# iProphet Synthesizer vs OB

The clearest difference is price: iProphet Synthesizer at $9.99 against OB's $19.99. iProphet Synthesizer also leads on iOS requirement (8.0 vs 15.0). OB's advantage is rating (4.1 vs 3.5) and review sentiment (75% vs 34%). On ratings volume, ads, in-app purchases and monetization model there is nothing between them.

iProphet Synthesizer costs $9.99 and OB $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

OB holds the better App Store score, 4.1 against 3.5. Both are backed by a comparable volume of ratings — 32 and 15 respectively. Written reviews point the same way: 34% of iProphet Synthesizer's written reviews are positive against 75% of OB's.

iProphet Synthesizer ships an update every 5 months, OB every 10 days. The most recent releases landed on November 6, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | iProphet Synthesizer | OB |
| --- | --- | --- |
| Price | **$9.99** | $19.99 |
| Rating | [3.5 (32 ratings)](https://appshunter.io/ios/app/iprophet-synthesizer/id898449685/reviews) | **[4.1 (15 ratings)](https://appshunter.io/ios/app/ob-xd-3-auv3-synth/id6654915211/reviews)** |
| Number of ratings | **32** | 15 |
| Positive reviews | 34.0% of reviews | **75.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 10 days** |
| Monetization | Paid | Paid |
| Size | 85 MB | 210 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-3-auv3-synth/id6654915211)

This app recreates a classic vintage synthesizer, offering rich, full-bodied tones for electronic music, recordings, and film scores. It features MPE support, an on-screen MIDI keyboard, and high-quality rendering for enhanced music production.

**Highlights:** Oberheim OB-X emulation, MPE support, On-screen MIDI keyboard, High-quality retina rendering, AUv3 improvements, Preset search with categories

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is iProphet Synthesizer free?

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

### Is OB free?

OB costs $19.99, with no in-app purchases.

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

OB is rated higher. iProphet Synthesizer averages 3.5 out of 5 from 32 ratings, while OB averages 4.1 from 15 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 10 days. Most recently, iProphet Synthesizer was updated on November 6, 2026 and OB 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.*