Comparison

4trMTR vs SynthBridge MIDI Synth

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

Head to head
About

4trMTR

Record and layer multiple musical performances one track at a time to create a complete song. Easily manage your projects by saving, loading, and creating new ones through a simple tap interface.

Highlights
  • Four-track recording
  • Layered performances
  • Project saving
  • Project loading
  • New project creation
Features
Read full description

iPhoneを、シンプルな4トラックMTRに。 4trMTRは、ギター、ベース、ボーカルなどを1トラックずつ重ねて録音できる、シンプルなマルチトラックレコーダーです。 曲のアイデアを思いついたとき。 バンドのデモを作りたいとき。 楽器や歌を重ねて録音したいとき。 複雑なDAWを立ち上げなくても、iPhoneですぐに録音を始められます。 【シンプルな4トラック録音】 4つのトラックを使って、演奏や歌を重ねて録音できます。 例えば、 Track 1:ギター Track 2:ボーカル Track 3:ベース Track 4:コーラス といった使い方ができます。 【パンチイン録音】 録り直したい部分だけを指定して再録音できます。 演奏の一部分を修正したいときにも、最初からすべて録り直す必要はありません。 【入力を選んで録音】 利用可能な入力から、録音に使用する入力を選択できます。 iPhoneだけで手軽に録音したり、対応する外部オーディオ機器を使った録音にも活用できます。 【プロジェクトとして保存】 録音した内容はプロジェクトとして管理できます。 曲のアイデアやデモを残し、あとから続きを録音できます。 【シンプルだから、すぐ録れる】 初めてのレコーディングはカセットでした。 大した機能はなかったけれど、何でも作れる気がしました。 4trMTRは、そんなシンプルな録音の楽しさをiPhoneで再現するためのアプリです。 たくさんの機能を覚えるより、まず録音する。 楽器を持って、RECを押して、音を重ねる。 4trMTRで、あなたの曲のアイデアを残してみてください。

About

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.

Highlights
  • 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
Features
Read full description

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

Screenshots

4trMTR3 screens
SynthBridge MIDI Synth4 screens

Verdict

The call

The clearest difference is price: SynthBridge MIDI Synth at Free against 4trMTR's $0.99. SynthBridge MIDI Synth also leads on iOS requirement (15.0 vs 17.6). 4trMTR's advantage is in-app purchases (none vs 7). On review sentiment, update cadence, 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

SynthBridge MIDI Synth is free to download; 4trMTR costs $0.99 up front. SynthBridge MIDI Synth sells 7 in-app purchases, starting at $1.99 per month. 4trMTR asks for nothing beyond the download.

UpkeepUpdate frequency

4trMTR ships an update every 3 weeks, SynthBridge MIDI Synth every 11 days. The most recent releases landed on October 6, 2026 and October 13, 2026 respectively.

Scorecard4 real differences · 6 level
4trMTR versus SynthBridge MIDI Synth: the parameters behind the verdict, then further details
Parameter4trMTRSynthBridge MIDI Synth
Price$0.99Free — better
Rating—4.7 (3 ratings) — better
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings—3 — better
Update frequencyEvery 3 weeksEvery 11 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.615.0 — better
Further details — not scored
Size12 MB76 MB
Age rating4+4+
DeveloperYUKIO TOKIWA啟东 徐

Customer experience

4trMTR

Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

SynthBridge MIDI Synth

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

4trMTR

No in-app purchases

7 purchases

SynthBridge MIDI Synth

Subscriptions2
  • Cloud Monthly7 Days trial$1.991 Month
  • Cloud Yearly7 Days trial$12.991 Year
One-time5
  • Supporter Tip$0.99
  • Remove Ads$1.99
  • Supporter Plus$4.99
Show 2 more
  • SynthBridge Pro$4.99
  • Supporter Patron$9.99

Questions

Is 4trMTR free?
4trMTR costs $0.99, with no in-app purchases.
Is SynthBridge MIDI Synth free?
SynthBridge MIDI Synth is free to download, with in-app purchases available.
Do 4trMTR or SynthBridge MIDI Synth have ads?
Neither 4trMTR nor SynthBridge MIDI Synth shows ads.
Which is updated more often, 4trMTR or SynthBridge MIDI Synth?
4trMTR ships an update every 3 weeks, and SynthBridge MIDI Synth every 11 days. Most recently, 4trMTR was updated on October 6, 2026 and SynthBridge MIDI Synth on October 13, 2026.

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