Comparison

iProphet Synthesizer vs OB

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

iProphet Synthesizer

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
Read full description

When a punchy, fat sound is demanded, look no further. iProphet recreates the unique sound of the classic Sequential Circuits Prophet VS synthesizer. Need help? Have an issue or question? Please email us at support@retronyms.com. The Prophet VS's rareness and classic digital sound make it a mainstay for those who can find them. The sound is purely classic crisp digital sound that easily stands on its own, but at the same time is the perfect compliment to the sound of analog synthesizers. iProphet brings the crystaline vintage sound of four digital oscillators and allows sculpting them using a creamy and warm multimode filter. iProphet comes with over 500 presets created by some of todays best sound designers. Use it in Tabletop to compose your music. You can morph the sound of the 4 oscillators using the joystick or the vector mode and the vector envelope. You can also swap presets between iProphet and Arturia's Prophet V synthesizer which allows you to work on the iPad and finish in the DAW of your choice. iProphet is a Tabletop Ready app. The connect menu allows you to connect iProphet to the Retronyms Tabletop app, giving you an integration with a complete studio environment. Tabletop also features add-ons for more effects and instruments from other 3rd party companies. iProphet supports Core MIDI, interapp-audio as well as Audiobus technologies for perfect integration. The use of the brands 'Prophet' and 'Sequencial Circuits' is done with permission of Dave Smith Instruments. Features Include: - Vector screen with joysticks to mix oscillators and envelopes - Super flexible Modulation Matrix - 3 DSP effects (overdrive, delay, and chorus) - 96 different wave forms to control pitch - 4 filter types - Vector envelope featuring loop points - Unison/detune for beefy sounds - Full user MIDI mapping of panel controls - Tabletop Ready app - Soundcloud seeder (via Tabletop) - Render to .wav file (via Tabletop) - AudioCopy to paste your audio into another iPad application (via Tabletop)

About

OB

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
Read full description

OB-Xd is a classic synthesizer that captivates musicians with its rich, full-bodied tones and expansive sound design. Perfect for adding a vintage touch to electronic tracks, live recordings, or film scores, OB-Xd brings unique and expressive qualities to your music. Designed to recreate the Oberheim OB-X, it features enhancements like micro random detuning and unison for a fuller sound. Elevate your studio setup and music production with OB-Xd today. • Full MPE support with configurable pitch bend, aftertouch, timbre, and pressure depth. • On-screen MIDI keyboard with pitch bend and mod wheels (iPad only). • Native iOS popups, dialogs, and text input throughout the interface. • Search Presets with category subfolders and native no-results dialog. • High-quality retina rendering. • AUv3 improvements: async file choosers, host viewport resize, and Bluetooth MIDI access.

Screenshots

OB2 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard6 real differences · 4 level
iProphet Synthesizer versus OB: the parameters behind the verdict, then further details
ParameteriProphet SynthesizerOB
Price$9.99 — better$19.99
Rating3.5 (32 ratings)4.1 (15 ratings) — better
Positive reviews34.0% of reviews75.0% of reviews — better
Number of ratings32 — better15
Update frequencyEvery 5 monthsEvery 10 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
DevicesiPadiPhone, iPad, iPod — better
Requires iOS8.0 — better15.0
Further details — not scored
Size85 MB210 MB
Age rating4+4+
DeveloperArturiaDiscoDSP LLC

Customer experience

iProphet Synthesizer

All ratings30 ratings
Positive63.3%
Neutral3.3%
Negative33.3%
Written reviews100 reviews
Positive34.0%
Neutral17.0%
Negative49.0%

OB

All ratings16 ratings
Positive81.3%
Neutral0.0%
Negative18.8%
Written reviews12 reviews
Positive75.0%
Neutral8.3%
Negative16.7%

Bugs and requests

iProphet Synthesizer

Reported bugs

15 issues
  • 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
Show 10 more
  • Modulation settings incorrectly apply across different presets
  • Low-frequency humming loop persists during playback
  • AirPods Max audio quality degradation
  • Audiobus integration causes lockout and screeching
  • iPad goes to sleep during drone playback
  • Save preset function not working
  • Waveform display shows white blocks in Tabletop
  • Sustain pedal not responding to MIDI messages
  • Preset polyphony status changes unexpectedly
  • App becomes unresponsive in DAW environments

Requested features

14 requests
  • 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
Show 9 more
  • Full 8-note polyphony support
  • Background audio playback capability
  • MIDI output functionality
  • Master transpose feature
  • Key and velocity zones
  • Sequencer built into app
  • Sample rate adjustment options
  • Persistent MIDI channel settings
  • Last preset memory on app launch

OB

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

iProphet Synthesizer

No in-app purchases

None

OB

No in-app purchases

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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