Utilities · head to head
Syncthing vs CCleaner
Syncthing
Utilities
Continuous file synchronisation between your own devices
- From
- Free
- Rated
- -
CCleaner
Utilities
System cleanup and optimisation utility for Windows and Mac
- From
- Free
- Rated
- -
The short version
- Each has a real cost: Syncthing synchronisation, not backup: a deletion propagates to every device, and versioning must be configured deliberately; CCleaner registry cleaning has little measurable benefit on modern Windows and carries some risk of removing something needed
- They diverge on capability: Syncthing covers Peer-to-peer sync, CCleaner covers Junk file cleanup.
Where they differ
Only the attributes on which Syncthing and CCleaner 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 Syncthing
- Peer-to-peer sync
- Encrypted transport
- File versioning
- Selective sync
Only in CCleaner
- Junk file cleanup
- Registry cleaner
- Startup manager
- Software uninstaller
What people use each for
The jobs each tool is most often brought in to do.
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
CCleaner
- Reclaiming disk space from accumulated caches and temporary filesnot Syncthing
- Controlling startup programs on a slow-booting machinenot Syncthing
- Bulk uninstalling softwarenot Syncthing
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
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
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
Pricing, plan by plan
Syncthing
Free- SyncthingFree
- Full functionality
- No usage limits
- Community support
CCleaner
Free- FreeFree
- Core functionality
- Personal use
Which should you pick?
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.
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.
Questions people ask
- Is Syncthing or CCleaner better?
- Neither clearly leads. Syncthing starts at Free and CCleaner at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Syncthing or CCleaner?
- Syncthing starts at Free and CCleaner at Free.
- Does Syncthing or CCleaner run on more platforms?
- Syncthing runs on Windows, macOS, Linux, Android, Docker. CCleaner runs on Windows, macOS, Android.
- Can I use Syncthing for free?
- Both have a free tier, so you can try either at no cost before committing.
- What is Syncthing best used for?
- Syncthing is most often used for keeping files in step across personal machines without a cloud account, syncing data that must not sit on a third-party server for policy reasons, replacing a paid cloud storage subscription for sync-only needs. Of those, keeping files in step across personal machines without a cloud account and syncing data that must not sit on a third-party server for policy reasons are not what CCleaner is typically brought in for.
- What can Syncthing do that CCleaner cannot?
- Syncthing covers Peer-to-peer sync, Encrypted transport, File versioning, Selective sync. CCleaner covers Junk file cleanup, Registry cleaner, Startup manager, Software uninstaller.
Answered from the vendors’ own pages
Syncthing: Is Syncthing free?
Yes, open source with no licence fee and no storage costs, because there is no server.
CCleaner: Is CCleaner free?
There is a free version, with a paid Professional tier adding scheduled cleaning and real-time monitoring.
Syncthing: Is Syncthing a backup tool?
No. It synchronises, so deletions propagate. Use it alongside a real backup, not instead of one.
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: 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.
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.