SynthBridge MIDI Synth vs BubbleOK
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SynthBridge MIDI Synth
Transform your device into a versatile MIDI sound module and virtual piano. Load SoundFont files, connect controllers, and utilize expressive performance tools for practice, production, or live music.
- MIDI controller support (Bluetooth, USB, Network)
- SoundFont (SF2/SF3) loading and playback
- Multi-touch piano keyboard and drum pads
- Pitch bend and modulation wheels
- MIDI file playback and recording
- Customizable velocity curves
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Connect your MIDI keyboard, choose a sound, and play. SynthBridge turns your phone or tablet into a portable sound module and practice workspace. You can also start with the on-screen piano and drum pads. Your sounds: use the built-in library or import SF2/SF3 SoundFonts. Layer sounds and adjust their balance, effects and keyboard ranges. Your keyboard: connect compatible USB MIDI or Bluetooth MIDI devices. Control supported parameters with MIDI CC messages. Your practice: play MIDI files, follow the note visualization, and combine a metronome, loops and Style accompaniment. Your ideas: record MIDI performances, keep named drafts, preview takes and export MIDI files. MIDI files can also be converted to WAV or AAC audio. Your setup: save performance scenes and return to your sounds and playing settings. Use portrait or landscape layouts on phones and tablets. Some features and resources require in-app purchases. iOS or iPadOS 15.0 or later. USB and Bluetooth MIDI require compatible devices and accessories. https://synth.64bit.us/privacy.html https://synth.64bit.us/terms.html
BubbleOK
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BubbleOK helps you separate vocals and instruments, reduce noise, edit audio and export your work. • Separate vocals, accompaniment and individual instrument tracks. • Reduce background noise and convert supported audio into MIDI. • Import audio or video with the system file picker. • Arrange clips on a multitrack timeline and save editing drafts on your device. • Preview, export and share results in supported formats. Local editing tools work on your device. Cloud processing requires an internet connection and uses the allowance shown in the app. Sign in with Apple to synchronize your cloud history and minute balance across devices. Optional 100, 300 and 800-minute packs are one-time in-app purchases, with no subscription or automatic renewal. Purchased minutes do not expire. Prices are displayed by the App Store before purchase. Please use files you own or have permission to process. Processing quality depends on the source material. Download cloud results before the retention period shown in the app expires. Support: support@qipaoyin.com
Screenshots
Verdict
The clearest difference is update cadence: BubbleOK at every 4 days against SynthBridge MIDI Synth's every 2 weeks. SynthBridge MIDI Synth's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 17.0). On price, 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
Both are free to download. SynthBridge MIDI Synth sells 7 in-app purchases, starting at $1.99 per month and BubbleOK sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.
SynthBridge MIDI Synth ships an update every 2 weeks, BubbleOK every 4 days. The most recent releases landed on October 25, 2026 and October 31, 2026 respectively.
| Parameter | SynthBridge MIDI Synth | BubbleOK |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (4 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 2 weeks | Every 4 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 76 MB | 10 MB |
| Age rating | +4 | 4+ |
| Developer | 啟东 徐 | Luanping Chaoxi Network Technology Co., Ltd. |
In-app purchases
SynthBridge MIDI Synth
- Cloud Monthly7 Days trial$1.991 Month
- Cloud Yearly7 Days trial$12.991 Year
- Supporter Tip$0.99
- Remove Ads$1.99
- Supporter Plus$4.99
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- SynthBridge Pro$4.99
- Supporter Patron$9.99
BubbleOK
- 100 Minutes$0.99
- 300 Minutes$2.99
- 800 Minutes$5.99
Questions
Is SynthBridge MIDI Synth free?
Is BubbleOK free?
Do SynthBridge MIDI Synth or BubbleOK have ads?
Which is updated more often, SynthBridge MIDI Synth or BubbleOK?
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