You have 47 GB free on a 512 GB MacBook. System Settings → General → Storage says System Data is 168 GB. You open CleanMyMac, run Smart Scan, and it tells you it can free up 4.2 GB of Junk. You stare at the result and wonder where the other 164 GB of System Data went.
That gap is the entire reason CleanMyDev exists.
What does CleanMyMac actually do?
CleanMyMac, from MacPaw, has been on the market since 2008. It is the default answer when a non-technical user types "best Mac cleaner" into Google. The current product, marketed as CleanMyMac X and now CleanMyMac (2024 refresh), bundles seven main modules.
- Smart Scan: a one-button cleanup that finds caches, language files, browser data, mail downloads
- System Junk: deeper scan of
~/Library/Caches/, app log files, broken login items - Mail Attachments: deletes downloaded copies of attachments that still live on the server
- Trash Bins: empties all trash folders, including external drives
- Large and Old Files: finds files over a threshold, sorted by last opened
- Uninstaller: removes apps with their support files
- Malware Removal: signature-based scan for known macOS malware
It does this with a polished UI, animations, and presets. For a writer or designer on a 256 GB MacBook Air, that is enough. The product is good at what it targets.
What does CleanMyMac miss on a developer Mac?
The problem is not what CleanMyMac does, it is what it ignores. Modern developer caches live in paths that consumer cleaners never index. A few examples from real cleanups documented online.
A single Claude Code user filed Issue #18869 after losing 472 GB of disk to ~/.claude/debug and ~/Library/Caches/claude-cli-nodejs/. CleanMyMac does not scan those paths. A dev who freed 200 GB with a manual audit found Docker holding 108 GB across volumes, images, and build cache. CleanMyMac touches Docker barely. A Cursor user reported 72+ .pack files over 1 GB each. CleanMyMac knows nothing about Cursor's pack format.
The pattern repeats across the modern dev stack.
| Path | Typical size | CleanMyMac | CleanMyDev |
|---|---|---|---|
~/Library/Developer/Xcode/DerivedData/ |
10 to 80 GB | yes | yes |
~/Library/Developer/CoreSimulator/Caches/ |
5 to 40 GB | partial | yes |
~/Library/Developer/Xcode/iOS DeviceSupport/ |
10 to 30 GB | no | yes |
~/.claude/debug/ |
10 to 472 GB | no | yes |
~/Library/Caches/claude-cli-nodejs/ |
5 to 80 GB | no | yes |
~/.codex/sessions/ and rollouts |
5 to 40 GB | no | yes |
~/Library/Application Support/Cursor/User/globalStorage/ (.pack) |
5 to 70 GB | no | yes |
~/.cache/huggingface/{hub,datasets,transformers}/ |
10 to 200 GB | no | yes |
~/.ollama/models/ |
4 to 300 GB | no | yes (inspect, not nuke) |
~/Library/Containers/com.docker.docker/Data/vms/0/ (Docker.raw) |
10 to 120 GB | no | yes |
~/.npm/_cacache/, ~/.pnpm-store/, ~/.bun/install/cache/ |
1 to 20 GB | partial | yes |
node_modules graveyard across repos |
10 to 80 GB | no | yes |
Every row marked "no" or "partial" is a GB-scale category that CleanMyMac silently leaves on your disk.
How does the pricing compare?
This is the comparison most people care about. CleanMyMac is a subscription. CleanMyDev is not.
| Item | CleanMyMac | CleanMyDev |
|---|---|---|
| Price model | yearly subscription or premium one-time | one-time lifetime |
| Yearly cost (1 Mac) | ~$39.95 per year | $0 after purchase |
| Lifetime option | ~$89.95 once | $9.99 once |
| Free trial | limited scan, paid to clean | read-only audit, paid to clean |
| Bundled in Setapp | yes | no |
| Telemetry | yes, analytics on by default | no telemetry, no account |
| Subscription auto-renew | yes | not applicable |
Over three years, CleanMyMac on the yearly plan costs around $120. CleanMyDev costs $9.99 once. If you only need the developer-specific paths, the math is not close.
How do the safety models differ?
A skeptical developer does not want a cleaner that says "trust me, I'll clean 12 GB." They want a diff of what is about to disappear.
CleanMyMac's defaults lean toward automation. Smart Scan picks targets, presents a checked list, and removes them on confirm. The list collapses categories into summary rows like "User Cache Files" with a single size number. You can drill down, but the workflow does not push you to. There is no built-in dry run that writes a report you can paste somewhere.
CleanMyDev pushes the opposite direction.
- Every scan starts read-only. Nothing moves until you click a per-path confirm.
- Each row shows the full absolute path, the size on disk, last access date, and a risk label.
- The default delete action is Move to Trash, not permanent removal, so a 30-day undo always exists.
- No category requires sudo. The app refuses to operate above your user's home directory and standard developer cache roots.
- Receipts can be exported as a Markdown report listing every removed path and its byte count.
A quick example of what the audit looks like before any deletion happens.
# CleanMyDev runs the equivalent of these under the hood,
# but visualizes the output as a confirm-before-touch table.
du -sh ~/Library/Developer/Xcode/DerivedData 2>/dev/null
du -sh ~/Library/Developer/CoreSimulator/Caches 2>/dev/null
du -sh ~/.claude/debug 2>/dev/null
du -sh ~/Library/Caches/claude-cli-nodejs 2>/dev/null
du -sh ~/.codex 2>/dev/null
du -sh ~/.ollama/models 2>/dev/null
du -sh ~/.cache/huggingface 2>/dev/null
du -sh ~/Library/Containers/com.docker.docker 2>/dev/null
# Add this to ~/.claude/settings.json to bound future Claude growth.
# (Open issue #18869 on anthropics/claude-code)
# { "cleanupPeriodDays": 4 }
If a row looks wrong, you skip it. If a row looks expensive, you click Trash. There is no scan-and-pray button.
Which tool should you pick?
It depends entirely on what is filling your disk.
- If your bloat is mail attachments, Photos library cruft, browser caches, language files, and the basic
~/Library/Caches/layer, pick CleanMyMac. It has more polish there, more presets, more automation. The subscription pays for the convenience. - If your bloat is anything inside the developer stack, pick CleanMyDev. Xcode and Simulators alone are usually the first 50 GB. Add Claude Code, Cursor, Codex, Ollama, and Docker, and you are well past 150 GB that CleanMyMac will not see.
- If your bloat is both, run both. They overlap on maybe 5 percent of paths, and CleanMyDev's read-only audit will tell you in 60 seconds whether the developer side has enough to justify a license.
The hard part of the decision is acknowledging that "Mac cleaner" is now two different product categories. Consumer cleaners have not kept up with what a 2026 developer Mac actually stores, because the average consumer does not run ollama pull llama3:70b or leave Docker volumes from old Postgres containers. Devs do. That is the niche CleanMyDev is built for.
What about other CleanMyMac alternatives?
CleanMyDev is not the only option in the developer cleaner space. Pearcleaner, Devpurge, OnyX, Sensei, and Room Service all compete in adjacent slices. Each has different priorities. We cover the head-to-head matchups in CleanMyDev vs Pearcleaner and the full CleanMyMac alternatives roundup for 2026, and the broader landscape in the best Mac cleaner for developers in 2026.
Before you pick any cleaner, run the math on your own paths. The fastest way is to open the System Data autopsy guide and check whether your bottleneck is the consumer layer or the dev layer. If it is the dev layer, you already know the answer.
Ready to see your actual System Data breakdown?
CleanMyDev opens the bucket Apple keeps closed. 110+ developer-specific cleanup targets, Move-to-Trash by default, every path visible before you touch it, no subscription. Get the $9.99 lifetime license and run a read-only audit first. If it does not find at least one category in the 5+ GB range that CleanMyMac missed, you will know within five minutes.