Softwr

Utilities · head to head

Karabiner-Elements vs Syncthing

Karabiner-Elements logo

Karabiner-Elements

Utilities

Free open source keyboard remapper for macOS, working at driver level before the OS sees a keystroke

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: Karabiner-Elements it requires granting significant system-level permissions, including input monitoring, which some security-conscious users are reluctant to allow.; Syncthing synchronisation, not backup: a deletion propagates to every device, and versioning must be configured deliberately
  • They diverge on capability: Karabiner-Elements covers Low-level key remapping, Syncthing covers Peer-to-peer sync.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Karabiner-Elements and Syncthing actually diverge.

Attributes where Karabiner-Elements and Syncthing differ
AttributeKarabiner-ElementsSyncthing
PlatformsMacWindows, macOS, Linux, Android, Docker

Identical on both: starting price (Free), pricing model (Open source, no licence fee), 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 Karabiner-Elements

  • Low-level key remapping
  • Complex modifications
  • Per-app and per-device rules
  • Complex modification rule library
  • Simple modifications GUI
  • Apple Silicon native

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.

Karabiner-Elements

  • A developer who wants to remap Caps Lock to Escape or Control and needs tap versus hold behaviournot Syncthing
  • Someone switching from a Windows or Linux keyboard layout who wants familiar modifier positions on a Macnot Syncthing
  • A user with an accessibility need around key repeat rate or modifier key behaviour that macOS settings cannot covernot Syncthing
  • Anyone who wants serious keyboard customisation without paying for BetterTouchTool or a similar all-in-one toolnot Syncthing

Syncthing

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

Where each one falls short

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

Karabiner-Elements

  • It requires granting significant system-level permissions, including input monitoring, which some security-conscious users are reluctant to allow.
  • Writing custom complex modification rules by hand means editing JSON, which is a real barrier for a non-technical user without the community rule library.
  • It only remaps keyboard input, so a user who also wants gesture or window management customisation needs a second tool such as BetterTouchTool or Rectangle.
  • Being an unpaid open source project, support depends on GitHub issues and community forums rather than a vendor support desk with guaranteed response times.
  • It is Mac only, so it does nothing for remapping needs on a Windows or Linux machine in the same household.

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

Karabiner-Elements

Free
  • Karabiner-ElementsFree
    • Free and open source under the MIT licence
    • Full functionality with no paid tier
    • Optional donation via GitHub Sponsors or PayPal

Syncthing

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

Which should you pick?

Choose Karabiner-Elements if

  • You need low-level key remapping.
  • You want to start without paying.
  • You work on Mac.
  • You also want complex modifications.
Karabiner-Elements 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 Karabiner-Elements or Syncthing better?
Neither clearly leads. Karabiner-Elements 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, Karabiner-Elements or Syncthing?
Karabiner-Elements starts at Free and Syncthing at Free.
Does Karabiner-Elements or Syncthing run on more platforms?
Karabiner-Elements runs on Mac. Syncthing runs on Windows, macOS, Linux, Android, Docker.
Can I use Karabiner-Elements for free?
Both have a free tier, so you can try either at no cost before committing.
What is Karabiner-Elements best used for?
Karabiner-Elements is most often used for a developer who wants to remap caps lock to escape or control and needs tap versus hold behaviour, someone switching from a windows or linux keyboard layout who wants familiar modifier positions on a mac, a user with an accessibility need around key repeat rate or modifier key behaviour that macos settings cannot cover, anyone who wants serious keyboard customisation without paying for bettertouchtool or a similar all-in-one tool. Of those, a developer who wants to remap caps lock to escape or control and needs tap versus hold behaviour and someone switching from a windows or linux keyboard layout who wants familiar modifier positions on a mac are not what Syncthing is typically brought in for.
What can Karabiner-Elements do that Syncthing cannot?
Karabiner-Elements covers Low-level key remapping, Complex modifications, Per-app and per-device rules, Complex modification rule library. Syncthing covers Peer-to-peer sync, Encrypted transport, File versioning, Selective sync.

Answered from the vendors’ own pages

Karabiner-Elements: Is Karabiner-Elements really free?

Yes, entirely. It is open source under the MIT licence with no paid tier, though the project accepts voluntary donations.

Syncthing: Is Syncthing free?

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

Karabiner-Elements: Does it work on Apple Silicon Macs?

Yes, versions from 14 onward run natively on M1 through M4 chips.

Syncthing: Is Syncthing a backup tool?

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

Karabiner-Elements: Do I need to write JSON to use it?

Not necessarily. Simple key swaps use a GUI, and complex modifications can be imported from a public community rule library instead of writing rules by hand.

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.

Share

Related pages

More on Karabiner-Elements

More on Syncthing

Keep looking

Other head to heads