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Operating Systems · head to head

AlmaLinux vs Rocky Linux

AlmaLinux logo

AlmaLinux

Operating Systems

RHEL-compatible Linux from a non-profit foundation that chose interface compatibility over an exact rebuild

From
Free
Rated
-
Full reviewWebsite
Rocky Linux logo

Rocky Linux

Operating Systems

Community rebuild of Red Hat Enterprise Linux that still targets bug-for-bug binary compatibility

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: AlmaLinux it is deliberately not identical to RHEL, so any validation, certification or compliance process that assumes matching package contents needs re-examining before you standardise on it.; Rocky Linux source access depends on routes Red Hat has not yet closed, so no procurement team can obtain a contractual guarantee that one-to-one parity will still exist in three years.
  • They diverge on capability: AlmaLinux covers ABI compatibility, Rocky Linux covers Binary compatibility.
  • Prices and features above were last checked on 31 August 2026.

Where they differ

Only the attributes on which AlmaLinux and Rocky Linux actually diverge.

Attributes where AlmaLinux and Rocky Linux differ
AttributeAlmaLinuxRocky Linux
Platformsx86-64, x86-64-v2, ARM64, ppc64le, s390x, Cloud images, Containersx86-64, ARM64, ppc64le, s390x, Cloud images, Containers

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

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 AlmaLinux

  • ABI compatibility
  • x86-64-v2 build
  • ELevate
  • Restored hardware support
  • Elected governance
  • Frame pointers enabled

Only in Rocky Linux

  • Binary compatibility
  • Ten-year lifecycle
  • Peridot build system
  • migrate2rocky
  • Secure Boot
  • Special interest groups

What people use each for

The jobs each tool is most often brought in to do.

AlmaLinux

  • Keeping pre-2015 x86 servers in production past the point RHEL 10 will install on themnot Rocky Linux
  • Hosting providers and control panel users, where CloudLinux lineage means cPanel and similar stacks are testednot Rocky Linux
  • Teams that want faster security patching than a strict downstream rebuild can offernot Rocky Linux
  • Migrating CentOS 7 estates in place using ELevate rather than rebuilding every machinenot Rocky Linux

Rocky Linux

  • Replacing CentOS 7 or CentOS 8 fleets without moving to a per-socket subscriptionnot AlmaLinux
  • HPC and research clusters where node counts make commercial licensing impracticalnot AlmaLinux
  • Hosting and managed service providers who need a RHEL-shaped platform at zero licence costnot AlmaLinux
  • Development and test tiers that must match a RHEL production tier exactlynot AlmaLinux

Where each one falls short

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

AlmaLinux

  • It is deliberately not identical to RHEL, so any validation, certification or compliance process that assumes matching package contents needs re-examining before you standardise on it.
  • Shipping security fixes ahead of Red Hat means running code Red Hat has not published, which some regulated buyers treat as unvalidated rather than as an advantage.
  • No ISV support contract names AlmaLinux, so escalations with database and application vendors can stop at the operating system question.
  • Funding is concentrated in CloudLinux and a few cloud sponsors, so the elected board governs a project whose engineering capacity still depends heavily on one company.
  • Divergence from RHEL accumulates across a ten-year lifecycle, and the further into a release you are, the harder it becomes to argue that a RHEL test result predicts AlmaLinux behaviour.

Rocky Linux

  • Source access depends on routes Red Hat has not yet closed, so no procurement team can obtain a contractual guarantee that one-to-one parity will still exist in three years.
  • Errata are published after Red Hat, so for critical fixes there is usually a short window, and for point releases a longer one, where a patch is public upstream and not yet available to you.
  • No ISV certification: your Oracle, SAP or storage vendor contract names RHEL, and support staff can legitimately refuse to reproduce a fault on Rocky.
  • Governance and the main commercial sponsor share leadership, which buyers who compare it against AlmaLinux's elected board find harder to assess for independence.
  • There is no SLA and no phone number in the free product, so an outage escalation ends in community chat unless a CIQ contract is already in place.

Pricing, plan by plan

AlmaLinux

Free
  • AlmaLinuxFree
    • No subscription or registration
    • Unlimited installations
    • All architectures including x86-64-v2

Rocky Linux

Free
  • Rocky LinuxFree
    • No subscription or registration
    • Unlimited installations
    • All architectures and images

Which should you pick?

Choose AlmaLinux if

  • You need abi compatibility.
  • You want to start without paying.
  • You work on x86-64, x86-64-v2, ARM64, ppc64le, s390x, Cloud images, Containers.
  • You also want x86-64-v2 build.
AlmaLinux review

Choose Rocky Linux if

  • You need binary compatibility.
  • You want to start without paying.
  • You work on x86-64, ARM64, ppc64le, s390x, Cloud images, Containers.
  • You also want ten-year lifecycle.
Rocky Linux review

Questions people ask

Is AlmaLinux or Rocky Linux better?
Neither clearly leads. AlmaLinux starts at Free and Rocky Linux at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, AlmaLinux or Rocky Linux?
AlmaLinux starts at Free and Rocky Linux at Free.
Does AlmaLinux or Rocky Linux run on more platforms?
AlmaLinux runs on x86-64, x86-64-v2, ARM64, ppc64le, s390x, Cloud images, Containers. Rocky Linux runs on x86-64, ARM64, ppc64le, s390x, Cloud images, Containers.
Can I use AlmaLinux for free?
Both have a free tier, so you can try either at no cost before committing.
What is AlmaLinux best used for?
AlmaLinux is most often used for keeping pre-2015 x86 servers in production past the point rhel 10 will install on them, hosting providers and control panel users, where cloudlinux lineage means cpanel and similar stacks are tested, teams that want faster security patching than a strict downstream rebuild can offer, migrating centos 7 estates in place using elevate rather than rebuilding every machine. Of those, keeping pre-2015 x86 servers in production past the point rhel 10 will install on them and hosting providers and control panel users, where cloudlinux lineage means cpanel and similar stacks are tested are not what Rocky Linux is typically brought in for.
What can AlmaLinux do that Rocky Linux cannot?
AlmaLinux covers ABI compatibility, x86-64-v2 build, ELevate, Restored hardware support. Rocky Linux covers Binary compatibility, Ten-year lifecycle, Peridot build system, migrate2rocky.

Answered from the vendors’ own pages

AlmaLinux: What does ABI compatible mean in practice?

Binaries and kernel modules built for RHEL load and run. Package versions, patch sets and hardware support may differ. If your software only calls interfaces, you will notice nothing; if it inspects versions, you might.

Rocky Linux: Is Rocky Linux still binary compatible with RHEL after the 2023 source restrictions?

Yes, that remains the stated goal and the reason it takes sources from UBI containers and cloud instances instead of the customer portal. It is a goal maintained by effort, not by agreement, which is the risk you are accepting.

AlmaLinux: Which should I choose between AlmaLinux and Rocky Linux?

Rocky if a third party certifies against exact RHEL package versions or you want the closest possible copy. AlmaLinux if you need older CPU support, faster patches, or a foundation with an elected board.

Rocky Linux: Can I move a CentOS 7 machine to Rocky in place?

Not directly to Rocky 9. The usual path is the ELevate project, which is maintained by AlmaLinux and can upgrade CentOS 7 to Rocky 8, then migrate2rocky and a second major upgrade from there. Many teams rebuild instead.

AlmaLinux: Is there paid support?

Yes, but not from the foundation. CloudLinux and TuxCare sell support and extended lifecycle services, quoted rather than published.

Rocky Linux: What does support cost?

Nothing for the distribution. Commercial support is sold by CIQ under separate contract, and pricing is quoted rather than published.

AlmaLinux: Can I convert an existing RHEL or CentOS machine?

Yes. almalinux-deploy converts same-version RHEL and CentOS installs, and ELevate handles major version jumps, including from CentOS 7.

Rocky Linux: How does it differ from CentOS Stream?

CentOS Stream sits ahead of RHEL and receives changes before they ship in a RHEL release. Rocky sits behind it and reproduces what already shipped, which is what most CentOS users actually wanted.

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