OB vs 4
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.
4
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4パッドサンプラーはシンプルなサウンドプレーヤーです。 録音、ファイル、動画からオーディオをインポートし、4つのパッドに割り当てることができます。 各パッドは独立して動作するため、複数のサウンドを同時に再生できます。 波形を表示しながら開始位置を調整することで、簡単にオーディオをトリミングでき、再生タイミングを合わせることができます。 機能: - ファイル、録音、動画からオーディオをインポート - 4つのパッドにサウンドを割り当て - タップで即座に再生 - 複数のサウンドを同時に再生 - 波形プレビューでオーディオをトリミング - シンプルでミニマルなインターフェース すべてのオーディオはデバイスにローカルに保存されます。 データの収集や共有は一切行いません。 The 4-pad sampler is a simple sound player. You can import audio from recordings, files, and videos and assign them to 4 pads. Each pad operates independently, so you can play multiple sounds at the same time. By adjusting the starting position while displaying the waveform, you can easily trim the audio and adjust the playback timing. Function: - Import audio from files, recordings, and videos - Assign sound to 4 pads - Play instantly with a tap - Play multiple sounds at the same time - Trim audio with waveform preview - Simple and minimalist interface All audio is stored locally on the device. We do not collect or share data at all.
Screenshots
Verdict
The clearest difference is price: 4 at $1.99 against OB's $14.99. OB's advantage is iOS requirement (15.0 vs 26.2). On 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
OB costs $14.99 and 4 $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
| Parameter | OB | 4 |
|---|---|---|
| Price | $14.99 | $1.99 — better |
| Rating | 4.4 (65 ratings) — better | — |
| Positive reviews | 57.0% of reviews | — |
| Number of ratings | 65 — better | — |
| Update frequency | Every 2 months | — |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 26.2 |
| Further details — not scored | ||
| Size | 25 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | DiscoDSP LLC | eiki yonemoto |
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
4
Not enough reviews yet to summarise bugs or requests.
In-app purchases
OB
No in-app purchases
4
No in-app purchases









