Which fits your needs?
DissectMac: People who want free inspection and optional paid app/leftover cleanup.
WhatSize: Mac users who favor column browsing and integrated duplicate/cleanup tools.
Features, pricing, and workflow
Scroll across to compare
| Feature | DissectMac | WhatSize |
|---|---|---|
| Best fit | People who want free inspection and optional paid app/leftover cleanup. | Mac users who favor column browsing and integrated duplicate/cleanup tools. |
| Visualization | Treemap and search | Size-sorted columns and measurement views |
| Platforms and requirements | macOS (Intel and Apple Silicon builds) | macOS 11+ (current vendor requirements) |
| Pricing and editions | Map, search, and monitor are free; Pro is listed at $12.99 once plus tax. | Vendor lists $14.99 and a 30-day trial; upgrades may be priced separately. |
| Open source | No | No |
| Native macOS UI | Yes | Yes |
| Cleanup workflow | Pro moves selected files and app leftovers to Trash after review. | Review the chosen cleaning or duplicate action before applying it. |
| Reports and portability | The overview does not establish scan-report export. Preserve any app-removal decisions and rescan the same folders in NullDisk. | Preserve any saved measurements or reports supported by your version. The cited overview does not establish an import format shared with NullDisk. |
DissectMac: what stands out
A good fit for people who want free inspection and optional paid app/leftover cleanup.
DissectMac: strengths
- Free map, file search, and live monitor
- Filters for developer files and large storage categories
- Pro uninstaller and app-leftover cleanup
Considerations
- In-app clearing and uninstallation require Pro
- Treemap is the documented graphical view
- Confirm suspected leftovers belong to apps you no longer need
WhatSize: what stands out
A good fit for Mac users who favor column browsing and integrated duplicate/cleanup tools.
WhatSize: strengths
- Size-sorted columns and detailed filtering
- Duplicate-file tools and cleanup categories
- Updates measurements as the filesystem changes
Considerations
- Paid license after the trial
- Cleanup categories still require your judgment
- Check upgrade terms separately from the initial purchase
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 DissectMac?
A good fit for people who want free inspection and optional paid app/leftover cleanup. Map, search, and monitor are free; Pro is listed at $12.99 once plus tax.
When should I choose WhatSize?
A good fit for Mac users who favor column browsing and integrated duplicate/cleanup tools. Vendor lists $14.99 and a 30-day trial; upgrades may be priced separately.
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.