Apps similar to Volumist include FineTune, which is free and open source. Other options are SoundSource and Background Music. In total there are three Volume Control Tools like Volumist for Mac.
Menu bar utility for macOS offering per-app and per-device audio control, app routing to output devices, integrated 10-band EQ with 20 presets, real-time VU metering, volume boost up to 200 percent, quick device selection, persistent settings, and audio muting.
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Manage audio on a per-app basis, set individual volume and output devices, apply a 10-band equalizer or effects, customize headphone profiles, use Magic Boost for small speakers, adjust input or output settings rapidly, and access controls from the menu bar or floating window.
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Background Music is a macOS audio utility that can automatically pause your music, set individual apps' volumes, and record system audio.
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