mpump vs Roland TR-808 Software Rhythm Composer

mpump is a browser drum machine, groovebox, and step sequencer for creating beats and sharing them as links. Someone opening a shared link can change the groove and send a revised version. The browser tool includes drums, bass, synth, a mixer, and effects with real-time synthesis, as well as patterns, arpeggiators, and Euclidean rhythms. It supports MIDI clock synchronization and an Ableton Link bridge for use with Ableton Live, Logic Pro, Bitwig, Traktor, djay, and other Link-enabled apps. Recordings can be saved as WAV, and sessions can be imported or exported as JSON. The PWA works offline after its first load. Live Jam supports up to 4 peers, and Live Set supports up to 49 listeners; both are opt-in and currently need a user-provided relay because the public hosted relay is offline. The maker says there are no accounts or personal tracking and music stays on the user's device. mpump is free on Android, iOS, and the web, with source code under AGPL-3.0.

Roland TR-808 Software Rhythm Composer has no write-up on Specifiction yet; its figures are above.