SpaceLens vs DaisyDisk: which Mac disk analyzer should you use?
DaisyDisk popularized the beautiful disk-map view on the Mac, and it does that one job elegantly. SpaceLens covers the same visual map but adds the finders and cleanup workflow that turn 'seeing the problem' into 'fixing it': verified duplicates, developer debris, and a reviewable basket with undo. Here is an honest side by side.
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| Need | DaisyDisk | SpaceLens |
|---|---|---|
| Visual disk map | Beautiful sunburst | Sunburst and treemap |
| Scan speed | Fast | Bulk scan, up to ~230k files/sec |
| Find large files | Yes, visually | Dedicated large-file finder |
| Verified duplicate finder | Not a focus | Byte-verified duplicates |
| Developer debris (node_modules, caches) | Manual | Smart finder |
| Reviewable cleanup with undo | Delete from map | Basket, Trash-based undo |
| Runs on-device | Yes | Yes |
| Pricing model | One-time paid | Donation download, fully activated |
What each is best at
DaisyDisk is a focused, polished disk visualizer. If all you want is a gorgeous map to eyeball the biggest folders and delete a few, it is lovely.
SpaceLens is built for the whole loop: map, find, and clean safely. Alongside the sunburst and treemap it adds smart finders for large files, byte-verified duplicates and developer debris, and a reviewable cleanup basket where removals go through the Trash so you always have an undo.
Bottom line
Choose DaisyDisk if you only want the map. Choose SpaceLens if you want the map plus the finders and a safe, reviewable cleanup, on-device, as a donation download.
Frequently asked questions
Is there a free alternative to DaisyDisk?
SpaceLens is available on this site as a fully activated donation download. It offers the same sunburst and treemap disk map as DaisyDisk, plus finders for large files, verified duplicates and developer debris, and a reviewable cleanup with undo.
Which is faster at scanning a Mac disk?
SpaceLens uses bulk filesystem scanning at up to around 230,000 files per second. Both tools are quick on modern Macs, but SpaceLens is optimized for very large volumes.
Can SpaceLens find duplicate files like DaisyDisk?
SpaceLens includes a dedicated duplicate finder that verifies matches byte-for-byte, which is a stronger guarantee than similar-name matching. Duplicate detection is a core SpaceLens feature.
Do these tools upload my file listing anywhere?
No. SpaceLens runs entirely on-device, so nothing about your files leaves your Mac.