Apps similar to Filelight include WinDirStat, which is free and open source. Other options are WizTree, Baobab Disk Usage Analyzer, TreeSize and SpaceSniffer. There's no shortage of Disk Usage Analyzers like Filelight, with more than 50 alternatives for Windows, Mac, Linux, the web and Android.
FreeUpDisk is a free disk space analyzer and cleanup tool for Windows and Mac. Its core feature is a treemap visualization: a visual map where every file and folder on your drive is represented as a colored rectangle, with size proportional to how much space it occupies.
Native macOS disk analyzer that scans folders and space, presenting file-type treemaps or ring charts beside a Finder-style outline. It can reveal items, send them to Trash after confirmation, flag caches and build output, and offer an optional read-only JSON CLI.
Canada
MacDirStat is a free, open-source disk space analyzer for macOS, inspired by WinDirStat. It scans a drive or folder and draws every file as a color-coded rectangle sized by its disk usage, so the biggest files and folders stand out at a glance.
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