Comparison

Sunrizer synth vs OB

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

Head to head
About

Sunrizer synth

This virtual analog synthesizer offers a rich, warm sound with advanced features like SuperSaw emulation and morphing parameter control. It integrates seamlessly with MIDI hardware and sequencers, providing a professional-grade sound design experience on iOS.

Highlights
  • SuperSaw sound emulation
  • Dual filters with configurable routing
  • Morph Group for parameter control
  • CoreMidi and background audio support
  • Multi-mode oscillator multiplication
  • Microtuning support
Features
Read full description

"This really is the synth that keeps on giving! Inspiration and intuition truly blend together in this musical instrument." Alan Parsons Sunrizer Synth is a virtual analog synthesizer that takes the definition of iOS synthesizer to the next level. Thanks to carefully designed architecture and heavy usage of coprocessor it blurs the boundaries between iOS and hardware synthesizers. Sunrizer was built to perform and works perfectly with any MIDI keyboard or sequencer. A lot of research has been done in order to achieve unique character, warmth and clarity. HIGHLIGHTS · True SuperSaw sound emulation, first found in the legendary Roland JP-8000 synthesizer. SuperSaw is a layered waveform consisting of multiple saw waves which are detuned to create an extremely full and epic sound. · Two filters per voice with configurable routing. 16 filter types available, including less common like Comb, Formant or Frequency shifter. · The Morph Group function lets you continuously morph of up to 30 parameters in a sound (including effects), using only the modulation wheel. · Full support for CoreMidi, MIDI mapping, Virtual Midi Ports and background audio. · Multi mode lets you multiply oscillators to get unbelievably fat and full sound. · Support for microtuning - load scl and tun files. Create fascinating microtonal music which uses intervals not found in the Western system of 12 equal intervals to the octave. OSCILLATORS · 2 warm-sounding analog modelled oscillators, 2 sub-oscillators (except SuperSaw). Available waveforms: Saw, PWM pulse,Triangle, SuperSaw, FM (frequency of phase modulation). 6 oscillators per voice in multi-sono mode. · Oscillator 2 hard-sync and configurable routing · FM (true frequency modulation) and PM mode · Osc-mix, ring modulator · White noise oscillator FLEXIBLE MULTI FILTERS · Two independent filters per voice with configurable routing. Filter types: LPF, HPF, BPF, Analog LPF, Notch, Comb, All pass, Power LPF, Power BPF, Wave shaper, Resonator, Resampler, LPF+Resampler, Frequency shifter. · Configurable routing: serial or parallel with bypass option. · ADSR envelope, keyboard tracking and full LFO control. MODULATION · Two LFOs per voice. It's possible to assign each LFO to almost any parameter. 3 LFO running modes: trigger, 1 shot, global. 6 waveforms, phase and fade-in knobs. · The Morph Group function lets you continuously morph of up to 30 parameters in a sound (including effects), using only the modulation wheel. · Two Modulation ADSR Envelopes for amplitude and filters cutoff. · Pitch and modulation wheels. EFFECTS · A number of effects are built in: distortion, hi-q reverb, chorus, rotary speaker simulation, equalizer, phaser and stereo delay. Dual-band FX processing. ARPEGGIATOR · Sunrizer incorporates very powerful programmable arpeggiator. You should think of it more like a small step sequencer. OTHER FEATURES · Over 380 presets, 7 additional banks available for FREE in web library (more coming soon) · Hold button allows you to to keep notes sustaining until you play new notes · With Chord Memory function you can play the chord by only pressing single keys · Phrase sequencer · Compatible with AudioBus · Adjustable polyphony: 6-20 voices · Playback modes: poly, solo, arp · Built-in recorder supporting AudioCopy, DropBox and iTunes file sharing. · Supports AUv3, MIDI, IAA, AudioBus 2.0 Visit www.beepstreet.com for user manual and audio demos. * Sunrizer is now available on Mac and PC, check our website for more info "Specs aside, the most important thing is the sound… and it’s great." musicradar.com "Sunrizer is the first truly mature polyphonic synth for the iPad, a real, smooth and powerful sounding option for all sorts of stage and studio performances." Mark Jenkins, author "Analog Synthesizers"

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

Sunrizer synth3 screens
OB1 screens

Verdict

The call

The clearest difference is review sentiment: Sunrizer synth at 88% against OB's 57%. Sunrizer synth also leads on rating (4.7 vs 4.4) and price ($12.99 vs $14.99). OB's advantage is update cadence (every 2 months vs every 6 months). On ratings volume, ads, in-app purchases and device support 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

Sunrizer synth costs $12.99 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

Sunrizer synth holds the better App Store score, 4.7 against 4.4. Both are backed by a comparable volume of ratings — 183 and 65 respectively. Written reviews point the same way: 88% of Sunrizer synth's written reviews are positive against 57% of OB's.

UpkeepUpdate frequency

Sunrizer synth ships an update every 6 months, OB every 2 months. The most recent releases landed on September 29, 2026 and October 1, 2026 respectively.

Scorecard6 real differences · 4 level
Sunrizer synth versus OB: the parameters behind the verdict, then further details
ParameterSunrizer synthOB
Price$12.99 — better$14.99
Rating4.7 (183 ratings) — better4.4 (65 ratings)
Positive reviews87.8% of reviews — better57.0% of reviews
Number of ratings183 — better65
Update frequencyEvery 6 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS10.3 — better15.0
Further details — not scored
Size28 MB25 MB
Age rating4+4+
DeveloperBeepStreetDiscoDSP LLC

Customer experience

Sunrizer synth

All ratings183 ratings
Positive90.2%
Neutral5.5%
Negative4.4%
Written reviews303 reviews
Positive87.8%
Neutral5.3%
Negative6.9%

OB

All ratings65 ratings
Positive84.6%
Neutral4.6%
Negative10.8%
Written reviews86 reviews
Positive57.0%
Neutral12.8%
Negative30.2%

User reviews

Sunrizer synth

From 183 App Store ratings

What we love

  • 🎨 Exceptional sound quality
  • 👍 Intuitive and easy-to-use interface
  • 🎹 Powerful and flexible synth engine
  • 💡 Excellent preset library
  • 🎚️ Comprehensive modulation and effects

Room to improve

  • 🐛 Occasional crashes and glitches
  • 🔌 Compatibility issues with certain DAWs
  • 🔇 Limited audio export options
  • 🧭 Confusing preset management

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

Sunrizer synth

Reported bugs

3 issues
  • Synth freezes when loading certain presets
  • Inconsistent behavior when using multiple instances
  • Graphical issues on newer iPad models

Requested features

4 requests
  • Improved MIDI integration and control
  • Expanded arpeggiator and sequencing capabilities
  • More advanced sound design tools
  • Ability to save custom tunings

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

Sunrizer synth

No in-app purchases

None

OB

No in-app purchases

Questions

Is Sunrizer synth free?
Sunrizer synth costs $12.99, with no in-app purchases.
Is OB free?
OB costs $14.99, with no in-app purchases.
Which has better reviews, Sunrizer synth or OB?
Sunrizer synth is rated higher. Sunrizer synth averages 4.7 out of 5 from 183 ratings, while OB averages 4.4 from 65 ratings.
Do Sunrizer synth or OB have ads?
Neither Sunrizer synth nor OB shows ads.
Which is updated more often, Sunrizer synth or OB?
Sunrizer synth ships an update every 6 months, and OB every 2 months. Most recently, Sunrizer synth was updated on September 29, 2026 and OB on October 1, 2026.

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