NullDisk our pick
A native macOS disk-space analyzer with an interactive radial map. Native SwiftUI, allocated-size honesty with hard-link dedup, staged Trash-based removal, zero data collection — the complete package no rival matches end to end.
DaisyDisk
Sunburst makes whales unmissable; collector stages the harpooning.
Delve
APFS-aware measurement means the whale you see is the whale you get.
WhatSize
Power-user measuring with top-lists and deep drill-downs.
Nektony Disk Space Analyzer
Largest-file focus with a free first scan.
Disk Graph
Snapshots show which whale grew since last month.
OmniDiskSweeper
Largest-first sorting is the fastest whale radar ever made.
Zo vergelijken wij
We hid five files between 2 GB and 60 GB across system, library, and user folders, then timed how fast each tool surfaces all five — and whether reported sizes match allocated reality.
Veelgestelde vragen
What's usually the largest file on a Mac?
Virtual machines, iOS backups, Xcode archives, video renders, and Docker's disk image. Analyzers find yours in under a minute.
Why do tools disagree on file sizes?
Logical size vs allocated size, hard links counted twice, APFS clones and sparse files. Tools that measure allocated size with link dedup (like NullDisk) tell the truth about reclaimable space.
Should I delete large files or many small ones?
Large first — one decision, gigabytes back. Small-file janitoring has terrible ROI until the whales are gone.