Head to head
| GrandPerspective | Klarity Disk | |
|---|---|---|
| Visualization | Treemap | Treemap |
| Platform | macOS | macOS |
| Pricing | Open source Free and open source (GPL); small App Store fee for the packaged build | Paid Paid one-time purchase (around $7 at time of writing) |
| Open source | Yes | No |
| Native Mac | Yes | Yes |
Updated September 2026 · Prices change — please verify with the vendor.
GrandPerspective
The tiny open-source treemap that shows your biggest files instantly.
＋ GrandPerspective: Strengths
- Free and open source with a tiny footprint
- Treemap rectangles make the single biggest space hog obvious
- Fast rescans and a loyal power-user community
－ GrandPerspective: Weaknesses
- Treemap UI is utilitarian — no sunburst, no guided cleanup
- No collector tray or duplicate finder; deletion is file-by-file
- Development pace is slow compared with commercial rivals
Read the review: GrandPerspective → · GrandPerspective See alternatives →
Klarity Disk
A private offline analyzer with treemaps and system monitoring.
＋ Klarity Disk: Strengths
- Fully offline analysis with a no-telemetry privacy stance
- Treemap plus icicle views and a system monitor in one app
- One-time price with no subscription
－ Klarity Disk: Weaknesses
- Treemap-first; no sunburst option for radial-map fans
- Smaller vendor with less social proof than category leaders
- Monitoring extras may duplicate tools you already own
Read the review: Klarity Disk → · Klarity Disk See alternatives →
Verdict: GrandPerspective vs Klarity Disk
Choose GrandPerspective if you want treemap visualization with open-source transparency on macOS. Choose Klarity Disk if you prefer treemap views at paid pricing on macOS. And if you want a native Mac sunburst with a staged collector and zero telemetry, NullDisk is the third option that beats both on workflow.
Frequently asked questions
Which is better, GrandPerspective or Klarity Disk?
GrandPerspective wins on treemap visualization for macOS; Klarity Disk wins on treemap views for macOS. On price, Open source (GrandPerspective) vs Paid (Klarity Disk). The honest answer depends on your OS and whether you prefer maps or lists — read the verdict below.
Is there something better than both?
If you want a native Mac sunburst with allocated-size honesty, a staged removal collector, and zero data collection, NullDisk beats both on workflow — even where GrandPerspective or Klarity Disk wins on price.