4D Piano Pocket Player is the most perfect and easiest solution for bending any piano track!

Pause or push ahead:
Pause at a fermata! Push to the next note or chord feature is exclusively available here. These functions should serve you well when you need the next chord to align with you.

Make it accelerate or slow down:
Up to 25% to 250% of the original speed. Buckle up and enjoy a smooth ride in this magical time machine!

Transpose it:
Up to 12 semitones up or down. When used in conjunction with the loop back function, this is ideal for warmup exercises!

Bookmark it:
Let the app remember your favorite speed or spot intuitively, and let the music loop and snap back within a tap.

Open it:
Both MIDI and 4D JSON formats are recognized in custom playback and can be fetched through your personal iPhone or iPad directory. These are extremely light-weight, in comparison to wav's and mp3's. Standard MIDI files can be obtained from a wide range of softwares and platforms. 4D JSON files can be generated or recorded through the 4D Piano Enterprise, which comes with a low latency rehearsal environment with video chat and lightning fast piano transmission at

Select anything at anytime:
This app comes with hundreds of performance-ready sample tracks (i.e., the entire Handel's Messiah, opera arias, piano and instrumental concertos, and string method pieces).

Contact us for any further questions at

What’s New

Version 1.2.2

Fixes and Improvements:
- Added chord recognition display

Ratings and Reviews

5.0 out of 5
4 Ratings

4 Ratings

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This is a dream come true!!! Thank you for this app, it works so well and is a pleasure to use. Is there any possibility of using the track in recording? Or exporting tracks ?

Developer Response ,

Thank you for the feedback. It's definitely possible to capture your screen's audio and video while the piano part is playing. For example, the link below offers a good reference. Hope this helps!

pianivo ,

GREAT(independant volume control ?)

Excellent app, only wish you add independant volume control for left and right hands channels

Developer Response ,

Thank you! We will keep this in mind for future releases.

App Privacy

The developer, Lucas Tsun-Shiu Wong, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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