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File Storage · head to head

Ceph vs Kap

Ceph logo

Ceph

File Storage

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

From
Free
Rated
-
Full reviewWebsite
Kap logo

Kap

Utilities

Free open source screen recorder for macOS, focused on video and GIF capture rather than annotation

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.; Kap it has no annotation tools at all, so any still-image markup work needs a separate app such as Shottr or CleanShot X.
  • They diverge on capability: Ceph covers RADOS object store, Kap covers Multi-format export.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Ceph and Kap actually diverge.

Attributes where Ceph and Kap differ
AttributeCephKap
PlatformsLinuxMac
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 Kap

  • Multi-format export
  • Area, window or display capture
  • Plugin system
  • Basic trimming
  • Menu bar operation
  • Open source

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 Kap
  • Growing past the point where a proprietary array upgrade costs more than a rack of commodity serversnot Kap
  • Research and media environments with petabytes of data and staff who can operate storagenot Kap
  • Providing an S3 endpoint on premises with multi site replication under your own controlnot Kap

Kap

  • A developer recording a demo GIF for a README or documentation pagenot Ceph
  • A marketer capturing a quick product walkthrough clip without buying screen recording softwarenot Ceph
  • Someone creating App Store style device-framed screenshots for a listingnot Ceph
  • A user who only needs video capture and does not want to pay for a suite of annotation features they will not usenot 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.

Kap

  • It has no annotation tools at all, so any still-image markup work needs a separate app such as Shottr or CleanShot X.
  • There is no scrolling capture or OCR, features both Shottr and CleanShot X include.
  • Editing is limited to basic trimming, so anything beyond a simple cut needs a dedicated video editor afterward.
  • It is Mac only, offering nothing for screen recording needs on Windows.
  • As a volunteer-maintained open source project, updates and bug fixes depend on community contribution rather than a company with paid support obligations.

Pricing, plan by plan

Ceph

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

Kap

Free
  • KapFree
    • Free and open source under the MIT licence
    • MP4, WebM, GIF and device frame export
    • Plugin system for extended workflows

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 Kap if

  • You need multi-format export.
  • You want to start without paying.
  • You work on Mac.
  • You also want area, window or display capture.
Kap review

Questions people ask

Is Ceph or Kap better?
Neither clearly leads. Ceph starts at Free and Kap at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Ceph or Kap?
Ceph starts at Free and Kap at Free.
Does Ceph or Kap run on more platforms?
Ceph runs on Linux. Kap runs on Mac.
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 Kap is typically brought in for.
What can Ceph do that Kap cannot?
Ceph covers RADOS object store, RADOS Gateway, RBD block devices, CephFS. Kap covers Multi-format export, Area, window or display capture, Plugin system, Basic trimming.

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.

Kap: Is Kap free?

Yes, entirely. It is open source under the MIT licence with no paid tier.

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.

Kap: Does Kap do screenshots or only video?

It is focused on video and GIF recording. For still screenshots with annotation, pair it with Shottr or CleanShot X.

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.

Kap: Can Kap export directly to GIF?

Yes, GIF is one of its native export formats alongside MP4, WebM and Apple device frames.

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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