The best alternatives to Composr are Amper Music , Music Memos, and BandLab. If these 3 options don't work for you, we've listed a few more alternatives below.
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Music Memos is the easiest way for songwriters to capture and organize new musical ideas. Use your iPhone, iPad or iPod touch to record acoustic guitar, piano, voice, or any musical instrument as high-quality, uncompressed audio.
Treble is a platform for musicians to find all the resources needed to create and promote their music, from Production, Mixing, and Mastering, to Album Art, Press Photos, and Video.