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Monad, published by leduftw, is an audio monitoring and logging application currently available at version 2.0.1, with one release version distributed to date. The software serves a single, well-defined purpose: it watches what the host machine is playing and records that playback history as a structured timeline. To accomplish this, monad captures system audio directly from the computer, identifies the tracks being played through integration with the AudD music recognition service, and then writes a chronological record documenting what played and when. This design positions monad within the categories of audio recognition, media tracking, and system monitoring software, with particular relevance for users interested in music identification and listening history logging. Typical use cases include maintaining a personal archive of music heard on a machine throughout the day, reconstructing the soundtrack of a work session or event, identifying unfamiliar songs that played in the background, and building datasets of listening behavior for later review or analysis. Because identification relies on AudD, monad can recognize tracks even when no media player metadata is available, since it works from the audio signal itself rather than from application-specific integrations. The timeline output answers both halves of a common question, what was playing and at what time, making the logged data suitable for chronological review, exporting, or downstream processing by other tools. The application operates at the system audio level, meaning it can monitor playback regardless of which program, browser tab, or streaming service produced the sound, provided the audio passes through the machine's output. Version 2.0.1 represents the current and only listed release line of the software, indicating an actively maintained but early-stage project. Users evaluating monad should note that its functionality depends on the AudD identification service for track recognition, while the capture, monitoring, and timeline-writing behavior is handled locally by the application itself on the machine being observed.
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