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.
GrandPerspective
GPL treemap veteran for macOS. Small, fast, inspectable.
SquirrelDisk
AGPL sunburst for every desktop OS. Easiest open-source map going.
Disk Inventory X
GPL classic with a community revival keeping it alive on Apple Silicon.
Space Radar
MIT visualizer with three views including a flamegraph. Hackable by design.
Baobab (Disk Usage Analyzer)
GNOME's GPL analyzer — the pick if your fleet includes Linux boxes.
JDiskReport
Free-of-charge Java statistics with age and type distributions.
Jak porównujemy
License first (OSI-approved or equivalent), then usefulness on a modern Mac, visualization quality, and maintenance signs (recent commits or stable maturity). Abandoned code loses points no matter how pretty.
Częste pytania
Is open source safer for disk tools?
For analysis, yes: anyone can verify what the code reads and whether it phones home. NullDisk isn't open source, but it is fully offline with a published no-data policy — the next best thing.
Which open-source analyzer looks best?
SquirrelDisk's sunburst is the friendliest; GrandPerspective's treemap is the most effective. Beauty and power rarely share a repo.
Can I contribute to these projects?
Yes — GrandPerspective, SquirrelDisk, Space Radar, and Baobab all accept contributions. Check each repo's contributing guide.