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 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
Read full description

OB-Xd is based on the Oberheim OB-X. It attempts to recreate its sound and behavior, but as the original was very limited in some important ways, a number of things were added or altered to the original design. OB-Xd was designed to sound as good and as rich as the original. It implements micro random detuning. Also, like many synths of the OB-X's generation, the OB-Xd has no internal effects so its sounds and textures can be greatly enhanced by the use of additional processing like chorus, reverb, delay, etc.

Screenshots

OB1 screens

Verdict

The call

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.

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 $14.99 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, 4.4 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.

UpkeepUpdate frequency

iProphet Synthesizer ships an update every 5 months, OB every 2 months. The most recent releases landed on October 19, 2026 and October 15, 2026 respectively.

Scorecard7 real differences · 3 level
iProphet Synthesizer versus OB: the parameters behind the verdict, then further details
ParameteriProphet SynthesizerOB
Price$9.99 — better$14.99
Rating3.6 (32 ratings)4.4 (65 ratings) — better
Positive reviews34.0% of reviews57.0% of reviews — better
Number of ratings3265 — better
Update frequencyEvery 5 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPadiPhone, iPad, iPod — better
Requires iOS8.0 — better15.0
Further details — not scored
Size85 MB25 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 ratings65 ratings
Positive84.6%
Neutral4.6%
Negative10.8%
Written reviews86 reviews
Positive57.0%
Neutral12.8%
Negative30.2%

User reviews

iProphet Synthesizer

From 32 App Store ratings

What we love

  • 🎵 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

Room to improve

  • 🐛 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

OB

From 65 App Store ratings

What we love

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

Room to improve

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

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

Reported bugs

13 issues
  • 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)
Show 8 more
  • App suspends on iOS 14
  • No virtual keyboard in standalone app
  • AUv3 crashes when adding second instance
  • UI messed up in AU
  • Knobs don't line up with display
  • Wonky controls
  • Programmer page without menu, cannot save/open patches
  • LFOing filter cutoff jerky

Requested features

19 requests
  • Add last/high priority for mono patches
  • Increase polyphony to 8 voices
  • MIDI Learn functionality
  • Preset browser improvements (categories, scrolling)
  • Adjustable keyboard size
Show 14 more
  • GUI scaling/layout redesign for iPhone
  • Skins for GUI
  • MIDI keyboard in standalone mode
  • Effects
  • Preset manager
  • Zoom functionality for AUv3 on iPhone
  • Fix knob turning bugs
  • Add patch select in DAW apps
  • GUI color scheme options
  • Manual in settings
  • Import presets
  • Layering sounds (like original OBXa)
  • White pinstripes on blue background (cosmetic)
  • Mod wheel customization

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 $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 15, 2026.

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