Which fits your needs?
OmniDiskSweeper: Mac users who prefer a free size-sorted browser to a chart.
SpacePeek: Finder users who want to inspect archives before extracting or deleting them.
Features, pricing, and workflow
Scroll across to compare
| Feature | OmniDiskSweeper | SpacePeek |
|---|---|---|
| Best fit | Mac users who prefer a free size-sorted browser to a chart. | Finder users who want to inspect archives before extracting or deleting them. |
| Visualization | Largest-first column browser | Finder Quick Look folder/archive browser and size overview |
| Platforms and requirements | macOS | macOS 14+ |
| Pricing and editions | Free download from The Omni Group. | Free previews; optional $3.99 one-time Pro purchase in the US App Store. |
| Open source | No | No |
| Native macOS UI | Yes | Yes |
| Cleanup workflow | Open or Trash selected files from the size-sorted browser. | Inspection and copying; use Finder or a separate cleanup tool for removals. |
| Reports and portability | The official overview does not document report export. Keep important paths separately before rescanning in NullDisk. | SpacePeek previews existing folders and archives. Keep original archives and important paths; moving to NullDisk does not transfer Quick Look extension features. |
OmniDiskSweeper: what stands out
A good fit for Mac users who prefer a free size-sorted browser to a chart.
OmniDiskSweeper: strengths
- Largest-first file and folder browsing
- Open items or move them to Trash
- Official downloads include versions for older Macs
Considerations
- Column browsing rather than a graphical disk map
- Check the download requirements for your macOS version
- The cited overview does not document saved reports or duplicate matching
SpacePeek: what stands out
A good fit for Finder users who want to inspect archives before extracting or deleting them.
SpacePeek: strengths
- Preview and search folders plus ZIP, 7z, and RAR archives
- Folder-size overview without background indexing
- Pro adds deeper navigation and copying archive members
Considerations
- An inspection companion rather than a full-drive cleanup utility
- Free browsing stops after the first child level
- Pro archive copying is limited to 100 MiB per file
For a useful comparison on your own drive, match the scan root, access permissions, and size mode. Chart style changes how you explore the results; it does not by itself establish measurement accuracy.
Common questions
When should I choose OmniDiskSweeper?
A good fit for Mac users who prefer a free size-sorted browser to a chart. Free download from The Omni Group.
When should I choose SpacePeek?
A good fit for Finder users who want to inspect archives before extracting or deleting them. Free previews; optional $3.99 one-time Pro purchase in the US App Store.
Will both apps show the same size?
Not necessarily. Match the scan root, permissions, exclusions, and logical/allocated-size mode. Hard links, APFS clones, snapshots, sparse files, and cloud placeholders can change totals. A reported size is not a guaranteed amount recovered after deletion.