Comparison

OB vs Tera Pro

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

Head to head
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.

About

Tera Pro

Explore a vast array of sound synthesis methods, from analog emulations to modern digital techniques. Combine modules for unique sonic textures, enhanced by an intelligent interface and realtime visual feedback. Expand your sound palette with additional modules available through in-app purchases.

Highlights
  • Multiple synthesis methods (analog, FM, spectral, additive)
  • Physical modeling and wave shaping
  • Intelligent user interface with realtime scopes
  • Flexible module routing
  • 128-voice polyphony with vintage voice modeling
  • Seamless sound switching
  • Extensive preset library
Features
Read full description

Tera Pro brings together all major sound synthesis methods on one table. No matter if you want to recreate sounds from analogue legends or explore modern digital sounds with FM, Waveshaping or Wavetable synthesis. More can be added by In-App Purchases of new modules. Add some flavour of physical modelling and modules for additive synthesis. Combine them altogether for new sound experiences far beyond your wildest dreams. Tame this overwhelming amount of possibilities with Tera Pros intelligent user interface showing you only exactly what you need, paired with realtime oscilloscopes and level indicators helping you seeing what’s going on. Connect the modules with a flexible routing method without the visual cluttering of real wire cables needed in conventional modular synthesisers FAQ What does Tera Pro have that Tera Synth doesn't have ? 1) Additional Sound Modules - Spectrum oscillator ( borrowed from the heart of Addictive Synth ) - Wave shaper / folder opens the west coast synthesis - Vocal Morphing filter - KARPLUS (aka WaveGuide ) with new "Swarm" mode ( 3 detuned delays ) 2) Revised engine - Analog Polysynth Voice Modelling with characteristic subtle voice variations of timbre, pitch and temporal behaviour to get you "The" Analog Sound. - 128 vs 32 voices polyphony - Seamless Sound Switching: change presets during play without cutting off the sound. - 8 times unison for really heavy ambients - Envelope generators with Buchla style "end of cycle" trigger for generative music - Stack/Split Sounds - New effect section 3) Redesigned User Interface - Collapsible modules for clear view of modular structure - No more nasty popups for LFOs/Envelope generators - Realtime oscilloscopes added to selected modules 4) New Presets - About 1000 additional presets in there. Tera never sounded this good... Tera Pro Specifications - 128 voice Modular polyphonic Synthesiser - Mono/Dual/Split Voice Architecture - Modules for analog and FM synthesis - Modules for Spectral Synthesis and Additive Synthesis - Karplus Strong Physical Modelling and Wave Shaping - MIDI Polyphonic Expression (MPE) - Vintage voice modelling for organic warm sound character - 1800+ Factory presets included - PDF Manual included - Standalone, AUv3 and IAA compatible - Ableton Link - Bluetooth MIDI - ... Additional modules through In-App Purchases: - Classic Wavetable synthesis with Import - Classic 6-OP FM Synthesis fully compatible to DX7 sysex files. - BrainZ multiple synthesis module based on MI Plaits Eurorack module. - RingZ physical modelling module based on MI Rings Eurorack module. - CloudZ granular synthesis module based on MI Clouds Eurorack module.

Screenshots

OB1 screens
Tera Pro2 screens

Verdict

The call

The clearest difference is price: Tera Pro at $6.99 against OB's $14.99. Tera Pro also leads on update cadence (every 5 days vs every 2 months) and review sentiment (69% vs 57%). OB's advantage is in-app purchases (none vs 6). On rating, ratings volume, ads 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

OB costs $14.99 and Tera Pro $6.99 up front. Tera Pro sells 6 one-off in-app purchases. OB asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Tera Pro holds the better App Store score, 4.6 against 4.4. Both are backed by a comparable volume of ratings — 65 and 155 respectively. Written reviews point the same way: 57% of OB's written reviews are positive against 69% of Tera Pro's.

UpkeepUpdate frequency

OB ships an update every 2 months, Tera Pro every 5 days. The most recent releases landed on October 15, 2026 and October 4, 2026 respectively.

Scorecard6 real differences · 4 level
OB versus Tera Pro: the parameters behind the verdict, then further details
ParameterOBTera Pro
Price$14.99$6.99 — better
Rating4.4 (65 ratings)4.6 (155 ratings) — better
Positive reviews57.0% of reviews69.4% of reviews — better
Number of ratings65155 — better
Update frequencyEvery 2 monthsEvery 5 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.012.0 — better
Further details — not scored
Size25 MB306 MB
Age rating4+4+
DeveloperDiscoDSP LLCHarry Gohs

Customer experience

OB

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

Tera Pro

All ratings155 ratings
Positive88.4%
Neutral5.8%
Negative5.8%
Written reviews72 reviews
Positive69.4%
Neutral18.1%
Negative12.5%

User reviews

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

Tera Pro

From 155 App Store ratings

What we love

  • 🎵 Exceptional sound quality and versatile synthesis capabilities
  • 💡 Innovative modular workflow with flexible architecture
  • 🎛️ Extensive preset library (1000+ presets)
  • 🔧 Powerful sound design tools with multiple synthesis types
  • 📱 Available on both iOS and macOS (M1)

Room to improve

  • 🎮 Steep learning curve and complex UI
  • ⌨️ Unconventional on-screen keyboard design
  • 🐛 Frequent crashes and stability issues
  • 🔊 Dangerously loud output without limiter
  • ⚙️ UI elements sometimes unresponsive or laggy

Bugs and requests

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

Tera Pro

Reported bugs

17 issues
  • App crashes on macOS and iOS
  • Piano keyboard not appearing
  • Wavetable module IAP producing no sound
  • In-app purchases disappearing or not activating
  • Presets causing white noise or feedback blasts
Show 12 more
  • UI glitches preventing parameter adjustment
  • Randomize function not working with wavetable oscillators
  • Arpeggiator losing sync in AUM
  • No sound output until patch toggling
  • LFO panel crashes when adjusting settings
  • Wavetable oscillator remaining silent
  • MIDI Learn settings not clearable
  • App not appearing in iPad Settings or Files app
  • Patches with feedback that require MIDI Panic
  • Inconsistent oscillator routing display
  • Parameter adjustment randomly not working
  • Sample rate unable to be changed

Requested features

15 requests
  • Undo/Redo functionality
  • MIDI Panic button (prominent placement)
  • Output limiter for safety
  • Standard black and white keyboard option
  • Favorites/bookmarking system for presets
Show 10 more
  • MIDI Learn reset/clear functionality
  • Key Hold button on main screen
  • Sampler module
  • Many-to-many modulation matrix
  • Fully dark theme on all UI screens
  • MIDI Program Change support
  • Solo and Mute buttons for oscillators
  • Partial number indicators for spectral oscillator
  • Better file system integration for backups
  • Improved velocity/aftertouch separation on keyboard

In-app purchases

None

OB

No in-app purchases

6 purchases

Tera Pro

One-time6
  • Library WaveShaper$0.99
  • Module Waves$5.99
  • FM 7 module$5.99
Show 3 more
  • Module RingZ$5.99
  • Module BrainZ$6.99
  • Module CloudZ$9.99

Questions

Is OB free?
OB costs $14.99, with no in-app purchases.
Is Tera Pro free?
Tera Pro costs $6.99, and also offers in-app purchases.
Which has better reviews, OB or Tera Pro?
Tera Pro is rated higher. OB averages 4.4 out of 5 from 65 ratings, while Tera Pro averages 4.6 from 155 ratings.
Do OB or Tera Pro have ads?
Neither OB nor Tera Pro shows ads.
Which is updated more often, OB or Tera Pro?
OB ships an update every 2 months, and Tera Pro every 5 days. Most recently, OB was updated on October 15, 2026 and Tera Pro on October 4, 2026.

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