Utilities · head to head
CCleaner vs Syncthing
CCleaner
Utilities
System cleanup and optimisation utility for Windows and Mac
- From
- Free
- Rated
- -
Syncthing
Utilities
Continuous file synchronisation between your own devices
- From
- Free
- Rated
- -
The short version
- Each has a real cost: CCleaner registry cleaning has little measurable benefit on modern Windows and carries some risk of removing something needed; Syncthing synchronisation, not backup: a deletion propagates to every device, and versioning must be configured deliberately
- They diverge on capability: CCleaner covers Junk file cleanup, Syncthing covers Peer-to-peer sync.
Where they differ
Only the attributes on which CCleaner and Syncthing actually diverge.
Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Utilities).
What each one covers
Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.
Only in CCleaner
- Junk file cleanup
- Registry cleaner
- Startup manager
- Software uninstaller
Only in Syncthing
- Peer-to-peer sync
- Encrypted transport
- File versioning
- Selective sync
What people use each for
The jobs each tool is most often brought in to do.
CCleaner
- Reclaiming disk space from accumulated caches and temporary filesnot Syncthing
- Controlling startup programs on a slow-booting machinenot Syncthing
- Bulk uninstalling softwarenot Syncthing
Syncthing
- Keeping files in step across personal machines without a cloud accountnot CCleaner
- Syncing data that must not sit on a third-party server for policy reasonsnot CCleaner
- Replacing a paid cloud storage subscription for sync-only needsnot CCleaner
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
CCleaner
- Registry cleaning has little measurable benefit on modern Windows and carries some risk of removing something needed
- The free version prompts toward the paid one persistently
- A 2017 supply chain compromise distributed malware through an official signed build, which permanently changed how some administrators view it
- Much of what it does is achievable with the disk cleanup tools built into Windows
Syncthing
- Synchronisation, not backup: a deletion propagates to every device, and versioning must be configured deliberately
- Devices must be online simultaneously to sync, so an always-on machine is effectively required
- Initial setup involves exchanging device IDs and is less approachable than signing into a cloud service
- No web access to files, since there is no server holding them
Pricing, plan by plan
CCleaner
Free- FreeFree
- Core functionality
- Personal use
Syncthing
Free- SyncthingFree
- Full functionality
- No usage limits
- Community support
Which should you pick?
Choose CCleaner if
- You need junk file cleanup.
- You want to start without paying.
- You work on Windows, macOS, Android.
- You also want registry cleaner.
Choose Syncthing if
- You need peer-to-peer sync.
- You want to start without paying.
- You work on Windows, macOS, Linux, Android, Docker.
- You also want encrypted transport.
Questions people ask
- Is CCleaner or Syncthing better?
- Neither clearly leads. CCleaner starts at Free and Syncthing at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, CCleaner or Syncthing?
- CCleaner starts at Free and Syncthing at Free.
- Does CCleaner or Syncthing run on more platforms?
- CCleaner runs on Windows, macOS, Android. Syncthing runs on Windows, macOS, Linux, Android, Docker.
- Can I use CCleaner for free?
- Both have a free tier, so you can try either at no cost before committing.
- What is CCleaner best used for?
- CCleaner is most often used for reclaiming disk space from accumulated caches and temporary files, controlling startup programs on a slow-booting machine, bulk uninstalling software. Of those, reclaiming disk space from accumulated caches and temporary files and controlling startup programs on a slow-booting machine are not what Syncthing is typically brought in for.
- What can CCleaner do that Syncthing cannot?
- CCleaner covers Junk file cleanup, Registry cleaner, Startup manager, Software uninstaller. Syncthing covers Peer-to-peer sync, Encrypted transport, File versioning, Selective sync.
Answered from the vendors’ own pages
CCleaner: Is CCleaner free?
There is a free version, with a paid Professional tier adding scheduled cleaning and real-time monitoring.
Syncthing: Is Syncthing free?
Yes, open source with no licence fee and no storage costs, because there is no server.
CCleaner: Does registry cleaning actually help?
Very little on modern Windows. The measurable gains come from clearing caches and controlling startup programs, not from the registry.
Syncthing: Is Syncthing a backup tool?
No. It synchronises, so deletions propagate. Use it alongside a real backup, not instead of one.
CCleaner: Is CCleaner safe?
It is a mainstream product from Gen Digital, though a 2017 supply chain attack distributed malware via an official build. That was resolved, and it remains a fair reason some administrators avoid it.
Syncthing: Do my files pass through anyone else’s servers?
No. Transfers are peer to peer and encrypted. Discovery and relay servers can help devices find each other, and relayed traffic remains encrypted end to end.