$2.99
About
Jelly Jammer is a fun synthesiser phone/iPad app that lets kids and adults alike experiment with sounds, build songs, and share music. It helps teach about sound and music theory in a fun and engaging way. Feel free to check out the free, limited, web version before you purchase the app.
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What's New in Jelly Jammer
1.4.0
August 4, 2026
- MORE Jellies! — From more realistic instruments to sound effects. A new Jelly filter system helps find the Jelly you want. - Note spelling — The row editor picks a pitch as octave + base note + modifier (double flat through double sharp), so a song written in flats can be entered as written. - Studio Filter moved — Now a Settings tile under Advanced rather than a song's menu, since it colours everything the app plays and exports. - Smaller, tidier shares — .jam files are compressed (around 75% smaller) and no longer preview as a wall of JSON when shared. Older .jam files still import. - Fixes — Leaving the Stage mid-song no longer crashes; Android 15 edge-to-edge display and 16 KB page-size support.
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