OB vs Tera Pro
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Oberheim OB-X emulation
- Recreates original sound and behavior
- Added enhancements to original design
- Micro random detuning
- Rich and good sound quality
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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.
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.
- 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
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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
Verdict
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
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.
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.
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.
| Parameter | OB | Tera Pro |
|---|---|---|
| Price | $14.99 | $6.99 — better |
| Rating | 4.4 (65 ratings) | 4.6 (155 ratings) — better |
| Positive reviews | 57.0% of reviews | 69.4% of reviews — better |
| Number of ratings | 65 | 155 — better |
| Update frequency | Every 2 months | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 25 MB | 306 MB |
| Age rating | 4+ | 4+ |
| Developer | DiscoDSP LLC | Harry Gohs |
Customer experience
OB
Tera Pro
User reviews
OB
From 65 App Store ratingsWhat 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 ratingsWhat 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)
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- 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
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- 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
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- 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
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- 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
OB
No in-app purchases
Tera Pro
- Library WaveShaper$0.99
- Module Waves$5.99
- FM 7 module$5.99
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- Module RingZ$5.99
- Module BrainZ$6.99
- Module CloudZ$9.99








