Realtime REC

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Step REC

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Rhythm Circle System

The principle of our system is to fractionize a circle by each type of note and visualize your music patterns allowing you to create complex rhythms without effort.


Imagine each measure like a circle and every circle represents a whole note.

Time Signature

Now split this circle by the number of beats (4/4) resulting in (4) quarter notes to complete a measure.

Fractional Visualization

Each note unit represents a fraction of the circle.

Complex rhythms

Never-ending rhythm pattern exploration (2/4, 3/4, 4/4, 5/4, 6/8, 9/8, 12/8)​, create complex and simple rhythms for your songs.


Create your rhythm with ease, you don't have to worry ​about notation mistakes or notes out of the measure.

notation support

Create accents, ligatures, and triplets without effort.

Premium features

Become a premium user and have full access to the next features:

Musical Scales

Create unique melodies and harmonies, explore different styles with an outstanding selection of Scales, and preview it over the instrument.

Chord Extensions​ & Inversions

Resolve your song harmony and explore multiple chord flavors.

Variety of
Time Signatures

Create popular and unconventional rhythms like 2/4, 3/4, 4/4, 5/4, 6/8, 7/8, 9/8,12/8 and more..

8 Tracks support

Create complex projects either Step Rec or Realtime Rec tracks.

Full sound library

Create a dynamic project with a vast selection of instruments audio

Export MIDI

The best option for continue your work in a desktop DAW, and keep refining your projects.

Premium Membership

Subscribe to have full access to all the features of BComposer PRO and any new features.

Free Membership
still powerful tool to create your ideas
Premium Membership
go to the next level and have full access
Musical Scales 1 All (+200)
Time Signatures 4/4
(2/4, 3/4, 4/4 5/4, 6/8, 7/8, 9/8, 12/8​)
Number of Tracks by project 2 8
Sound library
5 All
MIDI controller support  
Export to MIDI  
Chord extensions   
Access to any new feature      

Check our other Musical Apps

BComposer Metronome

keep the pulse and visualize the tempo with our rhythm circle system.


Learn and play creating rhythm patterns easily.


Resolve harmonies and melodies and keep all the music scales in your pocket.