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File Storage · head to head

Ceph vs Syncthing

Ceph logo

Ceph

File Storage

Open source distributed storage providing object, block and file from one cluster

From
Free
Rated
-
Full reviewWebsite
Syncthing logo

Syncthing

Utilities

Continuous file synchronisation between your own devices

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Ceph ceph assumes an operator who understands placement groups, CRUSH rules and recovery tuning, so organisations without dedicated storage staff routinely end up with a cluster that works until the first failure and then does not.; Syncthing synchronisation, not backup: a deletion propagates to every device, and versioning must be configured deliberately
  • They diverge on capability: Ceph covers RADOS object store, Syncthing covers Peer-to-peer sync.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which Ceph and Syncthing actually diverge.

Attributes where Ceph and Syncthing differ
AttributeCephSyncthing
PlatformsLinuxWindows, macOS, Linux, Android, Docker
CategoryFile StorageUtilities

Identical on both: starting price (Free), pricing model (Open source, no licence fee), free tier (Yes), user rating (Not yet rated).

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 Ceph

  • RADOS object store
  • RADOS Gateway
  • RBD block devices
  • CephFS
  • CRUSH placement
  • Erasure coded pools

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.

Ceph

  • Backing a private cloud where virtual machine disks, shared filesystems and an S3 endpoint all need the same hardwarenot Syncthing
  • Growing past the point where a proprietary array upgrade costs more than a rack of commodity serversnot Syncthing
  • Research and media environments with petabytes of data and staff who can operate storagenot Syncthing
  • Providing an S3 endpoint on premises with multi site replication under your own controlnot Syncthing

Syncthing

  • Keeping files in step across personal machines without a cloud accountnot Ceph
  • Syncing data that must not sit on a third-party server for policy reasonsnot Ceph
  • Replacing a paid cloud storage subscription for sync-only needsnot Ceph

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Ceph

  • Ceph assumes an operator who understands placement groups, CRUSH rules and recovery tuning, so organisations without dedicated storage staff routinely end up with a cluster that works until the first failure and then does not.
  • Small clusters are inefficient: three way replication means a third of raw capacity is usable, and erasure coding needs enough failure domains to be safe, so the economics only work above a certain size.
  • Recovery and rebalancing generate heavy internal traffic, so a failed disk can degrade client latency across the cluster unless backfill is throttled correctly beforehand.
  • Upgrades must follow a strict daemon order across monitors, managers, OSDs and gateways, and a mistake in that order on a live cluster is difficult to reverse.
  • Because it is self hosted, every byte served to the internet is transit you pay for on your own links, so the free licence does not mean free egress and bandwidth planning becomes your problem rather than the providers.

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

Ceph

Free
  • CephFree
    • Full functionality, no capacity limit
    • Object, block and file interfaces
    • Community support via mailing list and Slack

Syncthing

Free
  • SyncthingFree
    • Full functionality
    • No usage limits
    • Community support

Which should you pick?

Choose Ceph if

  • You need rados object store.
  • You want to start without paying.
  • You work on Linux.
  • You also want rados gateway.
Ceph review

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.
Syncthing review

Questions people ask

Is Ceph or Syncthing better?
Neither clearly leads. Ceph 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, Ceph or Syncthing?
Ceph starts at Free and Syncthing at Free.
Does Ceph or Syncthing run on more platforms?
Ceph runs on Linux. Syncthing runs on Windows, macOS, Linux, Android, Docker.
Can I use Ceph for free?
Both have a free tier, so you can try either at no cost before committing.
What is Ceph best used for?
Ceph is most often used for backing a private cloud where virtual machine disks, shared filesystems and an s3 endpoint all need the same hardware, growing past the point where a proprietary array upgrade costs more than a rack of commodity servers, research and media environments with petabytes of data and staff who can operate storage, providing an s3 endpoint on premises with multi site replication under your own control. Of those, backing a private cloud where virtual machine disks, shared filesystems and an s3 endpoint all need the same hardware and growing past the point where a proprietary array upgrade costs more than a rack of commodity servers are not what Syncthing is typically brought in for.
What can Ceph do that Syncthing cannot?
Ceph covers RADOS object store, RADOS Gateway, RBD block devices, CephFS. Syncthing covers Peer-to-peer sync, Encrypted transport, File versioning, Selective sync.

Answered from the vendors’ own pages

Ceph: How many nodes do I need to start?

Three is the practical minimum for a replicated cluster with real fault tolerance, and most production advice starts at five once you account for maintenance windows.

Syncthing: Is Syncthing free?

Yes, open source with no licence fee and no storage costs, because there is no server.

Ceph: Is it faster than a SAN?

Not on single stream latency. It wins on aggregate throughput and on growing without a forklift upgrade, which is a different property from raw speed.

Syncthing: Is Syncthing a backup tool?

No. It synchronises, so deletions propagate. Use it alongside a real backup, not instead of one.

Ceph: Can I buy support?

Yes. IBM sells IBM Storage Ceph and SUSE and others have offered supported builds; the upstream project itself is free.

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.

Ceph: Should I use it just for S3?

If object is all you need, a dedicated object store is simpler to run. Ceph earns its complexity when you need block and file as well.

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