4.8x faster than du on macOS, with a streaming TUI that shows results as it scans. Platform-optimized for macOS, Linux, and Windows.

Each platform uses native APIs for maximum speed, combined with rayon's work-stealing thread pool for parallel directory walking:

• macOS: getattrlistbulk fetches metadata for all entries in a directory in a single syscall, instead of one stat per file
• Linux: Parallel readdir + fstatat across all cores (uses d_type for zero-cost type detection)
• Windows: FindFirstFileExW with FindExInfoBasic and FIND_FIRST_EX_LARGE_FETCH returns file sizes inline with enumeration -- no separate stat calls needed

Sizes are reported as allocated (on-disk) bytes, not logical file size. This correctly accounts for sparse files commonly created by container runtimes.

cargo install fdu

Homebrew (macOS):

brew install montanaflynn/tap/fdu

Pre-built binaries for macOS (ARM/x86), Linux, and Windows are available on the releases page.

Usage: fdu [OPTIONS] [PATH]

Arguments:
  [PATH]  Path to scan (default: current directory) [default: .]

Options:
  -n, --top <TOP>            Number of top entries to display [default: 20]
      --min-size <MIN_SIZE>  Minimum file size to display (e.g. 100MB, 1GB)
      --files-only           Only show files, skip directory aggregation
      --no-tui               Print results to stdout without TUI
  -h, --help                 Print help

MIT