Comparison

MIDI Opener vs Chord Transpose

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

Head to head
About

MIDI Opener

This app is a powerful and modern MIDI player designed for musicians, learners, and creators. It offers visual playback, tempo and key control, and advanced track management. Import custom soundbanks and enjoy features like synchronized lyrics and a 3D visualizer.

Highlights
  • Visual MIDI playback
  • Tempo and key control
  • Advanced track controls
  • 128 General MIDI instruments
  • Built-in effects
  • Custom soundbanks
  • Synchronized lyrics
  • 3D visualizer
Features
Read full description

MIDI Opener – Play, Practice & Export MIDI Files Open any MIDI file and take full control of your music. MIDI Opener is a fast, precise MIDI player built for musicians who want to practice smarter, isolate parts, customize arrangements, route playback to external gear, export their changes, and deeply explore songs without the complexity of a DAW. WHY MIDI OPENER • Instantly open and play standard MIDI files (.mid, .midi) • Ultra-responsive playback with zero clutter • Built for practice, learning, live performance, and musical exploration • Completely ad-free POWERFUL PLAYBACK CONTROL • Change tempo in real time (slow down or speed up) • Transpose key instantly to match your instrument • Mute, solo, and adjust volume for each track • Swap instruments using all 128 General MIDI sounds • Import custom SoundFont (.sf2) and DLS soundbanks • Apply reverb, delay, distortion, and EQ effects EXPORT YOUR CHANGES • Export audio as MP3, M4A, or WAV • Export modified MIDI files with your changes • Save customized practice mixes and arrangements • Perfect for backing tracks, sharing, and rehearsal prep PRACTICE WITH PRECISION • Loop any section with A–B looping • Isolate difficult passages and repeat them • Break down complex songs into manageable parts • Save and instantly restore full practice setups with Snapshots Perfect for pianists, guitarists, producers, singers, music directors, and students. MIDI OUT & EXTERNAL DEVICES • Send MIDI playback to external keyboards, synths, drum machines, and sound modules • Connect over USB, Bluetooth, or Wi-Fi • Compatible with Logic Pro, Ableton Live, GarageBand, and CoreMIDI apps • Use premium external instrument sounds and studio hardware SING AND PRACTICE • View embedded lyrics when available • Real-time word highlighting synced to playback • Great for karaoke and vocal practice SEE YOUR MUSIC • Clean, readable note timeline • Beautiful full screen Focus Mode with ambient visuals, auto hiding controls, and optional synchronized lyrics • Track based visual layout • Retro 3D visualizer • Multiple visual themes ORGANIZE YOUR MIDI LIBRARY • Import from Files, AirDrop, Mail, and other apps • Create playlists • Queue songs for continuous playback UPGRADE OPTIONS Free — The Player & Customizer Open and play MIDI files with powerful built-in customization tools. Includes instrument swapping with all 128 General MIDI sounds, custom SoundFont and DLS support, synchronized lyrics, audio effects, song section looping, visual themes, saved mixes with Snapshots, playlists, queue support, and a complete MIDI song library experience—all in a fast, focused, ad-free player. Practice Pack — The Musician’s Upgrade Unlock advanced practice and arrangement tools including real-time tempo control, key transposition, per-track mute, solo, and volume controls, plus MP3 audio and MIDI export for creating custom practice mixes, backing tracks, and arrangements. MIDI Out — The Producer’s Upgrade Route MIDI playback to external keyboards, synths, drum machines, DAWs, and professional music hardware over USB, Bluetooth, or Wi-Fi using CoreMIDI. All Access — Everything, Once Get the complete MIDI Opener experience with every upgrade included, plus discounted upgrade pricing if you already own another product. FAST. FOCUSED. NO DISTRACTIONS. Made for musicians who want control—not complexity.

About

Chord Transpose

Easily transpose songs to a more comfortable key, displaying both scale and numeric values. Features capo placement suggestions to simplify playing difficult chords. Optimized for iPhone 6 and higher.

Highlights
  • Transpose songs to different keys
  • Display scale and numeric values
  • Capo placement suggestions
  • Simplify difficult chords
  • Optimized for newer iPhones
Features
Read full description

Ever been on stage or in your room writing songs or just to play the best hit. You find yourself singing along but the key does not fit your vocal ? You don't know how to play these tedious chords that does not even sound great. Transposer strive to make it as easy as possible to transpose from one key to another displaying both keys scale and their numeric value. With Capo On you can choose the hardest key ever and the key you are most comfortable with and Transposer will display the fret number on which your capo should be. Happy Music! *Please note that this app is optimised for iPhone 6 and higher.

Screenshots

MIDI Opener4 screens
Chord Transpose4 screens

Verdict

The call

The clearest difference is rating: MIDI Opener at 3.9 against Chord Transpose's 3.2. MIDI Opener also leads on review sentiment (64% vs 43%) and ratings volume (86 vs 5). Chord Transpose's advantage is iOS requirement (12.1 vs 17.6). On price, update cadence, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. MIDI Opener sells 13 one-off in-app purchases and Chord Transpose sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

MIDI Opener holds the better App Store score, 3.9 against 3.2. That said, the two scores are not equally well evidenced: MIDI Opener has 86 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 64% of MIDI Opener's written reviews are positive against 43% of Chord Transpose's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 6 days. The most recent releases landed on October 22, 2026 and October 19, 2026 respectively.

Scorecard4 real differences · 6 level
MIDI Opener versus Chord Transpose: the parameters behind the verdict, then further details
ParameterMIDI OpenerChord Transpose
PriceFreeFree
Rating3.9 (86 ratings) — better3.2 (5 ratings)
Positive reviews64.5% of reviews — better42.9% of reviews
Number of ratings86 — better5
Update frequencyEvery 6 daysEvery 6 days
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPadiPhone, iPod
Requires iOS17.612.1 — better
Further details — not scored
Size334 MB20 MB
Age rating4+4+
DeveloperMartianRoverSMICO Consulting (Pty) Ltd.

Customer experience

MIDI Opener

All ratings86 ratings
Positive72.1%
Neutral8.1%
Negative19.8%
Written reviews76 reviews
Positive64.5%
Neutral11.8%
Negative23.7%

Chord Transpose

All ratings5 ratings
Positive60.0%
Neutral0.0%
Negative40.0%
Written reviews7 reviews
Positive42.9%
Neutral0.0%
Negative57.1%

Bugs and requests

MIDI Opener

Reported bugs

15 issues
  • Sustained notes are treated as staccato notes.
  • Cuts off the beginning of the song.
  • Kicked out of the app when clicking on another SoundFont.
  • Crashes when changing SoundFonts (iOS 26).
  • Bass drum is too quiet for metal music.
Show 10 more
  • Changing key option breaks songs.
  • App crashes on startup.
  • Randomly playing a single track only.
  • Skipping individual notes when too many are playing.
  • New update not working, won't play audio or understand certain instruments.
  • Google Drive method does not work.
  • Download button does nothing.
  • Skips a lot of notes.
  • No sound, plays silence.
  • Scrolling bar with no sound.

Requested features

18 requests
  • Adjust individual track volumes
  • Zoom in/out
  • Select region to play
  • Export features (WAV, MP3, FLAC)
  • Playlist functionality
Show 13 more
  • Library structure with nested folders
  • AUV3 plug-in support
  • IAA with audio hosts
  • Switchable color schemes
  • Spectrum editor/video export
  • Save MIDI soundfiles as MP3
  • More SoundBanks
  • Tempo control
  • Transpose option
  • Custom SoundFont support
  • Local storage/in-app folder
  • Background play
  • Option to play once (no loop)

Chord Transpose

Not enough reviews yet to summarise bugs or requests.

In-app purchases

13 purchases

MIDI Opener

One-time13
  • Tip$0.99
  • Full Upgrade Discount$0.99
  • Remove Ads$1.99
Show 10 more
  • Change Tempo$1.99
  • Change Tempo and Key$1.99
  • All Access Upgrade$2.99
  • Track Controls$2.99
  • Super Tip$4.99
  • MIDI Out$4.99
  • Practice Pack$4.99
  • Full Upgrade$4.99
  • Premium Upgrade$4.99
  • All Access$7.99
1 purchases

Chord Transpose

One-time1
  • Remove all Ads$2.99

Questions

Is MIDI Opener free?
MIDI Opener is free to download, with in-app purchases available.
Is Chord Transpose free?
Chord Transpose is free to download, with in-app purchases available.
Which has better reviews, MIDI Opener or Chord Transpose?
MIDI Opener is rated higher. MIDI Opener averages 3.9 out of 5 from 86 ratings, while Chord Transpose averages 3.2 from 5 ratings.
Do MIDI Opener or Chord Transpose have ads?
Neither MIDI Opener nor Chord Transpose shows ads.
Which is updated more often, MIDI Opener or Chord Transpose?
MIDI Opener ships an update every 6 days, and Chord Transpose every 6 days. Most recently, MIDI Opener was updated on October 22, 2026 and Chord Transpose on October 19, 2026.

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