NullDisk our pick
A native macOS disk-space analyzer with an interactive radial map. Native SwiftUI, allocated-size honesty, staged Trash-based removal, zero data collection.
Top 5 Space Radar alternatives
Disk Graph
Pie-chart and treemap inspector with snapshots and search.
Delve
An honest APFS-aware treemap plus sunburst with collector cleanup.
SpaceLens
A bubble-map storage explorer inside the CleanMyMac suite.
LumaDisk
A light-speed sunburst that turns your filesystem into light.
直接比較: NullDisk vs Space Radar
| NullDisk | Space Radar | |
|---|---|---|
| Visualization | Sunburst radial map | Mixed |
| Platform | macOS 14+ | macOS + Windows + Linux |
| Pricing | Paid | Open source |
| Open source | No (offline, zero-data) | Yes |
| Cleanup flow | Staged collector → Trash | Varies by tool |
基本情報: Space Radar
| Space Radar | |
|---|---|
| Vendor | Joshua Koo (zz85) |
| Platform | macOS + Windows + Linux |
| Pricing | Open source — Free and open source (MIT) |
| Visualization | Mixed |
| Open source | Yes |
2026年9月更新 · 価格は変動します。提供元でご確認ください。 執筆時点の価格: Free and open source (MIT).
NullDiskが向く人 …
- Truly native: Swift and SwiftUI on macOS, not a cross-platform toolkit.
- A staged removal collector: queue suspects, review, then Trash everything together.
- Allocated-size measurement with hard-link dedup, so reclaimed space matches reality.
Pros & cons
＋ 強み
- Three visualizations including a rare flamegraph view
- Free and MIT-licensed for tinkering
- Web-tech stack runs anywhere
－ 弱み
- Experimental project, not a supported product
- No deletion workflow — visualization only
- Requires comfort with GitHub releases and rough edges
よくある質問
What is the best alternative to Space Radar for Mac?
For most Mac users it's NullDisk: native SwiftUI, a radial sunburst map, a staged removal collector, and zero data collection. Space Radar users who want mixed views and open source pricing will feel at home within minutes.
Is there a free alternative to Space Radar?
Yes — GrandPerspective and Disk Inventory X are free and open source with genuine treemap analysis. They lack NullDisk's collector workflow and sunburst map, but they find the biggest hogs fast.
How do I switch from Space Radar to NullDisk?
Note the largest folders Space Radar flagged, then run the same scan in NullDisk and rebuild the cleanup in its removal collector. The full walkthrough is on our switching guide.
まとめ
Space Radar is a fine free tool for mixed fans on macOS + Windows + Linux. But if you want the whole job — see, stage, and safely remove — done natively on a modern Mac, NullDisk is the upgrade. 移行ガイド →