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Developer Tools · head to head

Atlantis vs Glean

Atlantis logo

Atlantis

Developer Tools

Runs Terraform plan and apply from pull request comments, self-hosted and free

From
Free
Free plan
Yes
Visit AtlantisFull review
Glean logo

Glean

Business Intelligence

Work AI that Works

From
On request
Free plan
No
Visit GleanFull review

The short version

  • Atlantis is free; Glean prices on request.
  • Where Glean falls short: no pricing published on website; enterprise sales model requires demo request.
  • Prices and features on this page were last checked on 13 November 2026.

Where they differ

Only the attributes on which Atlantis and Glean actually diverge.

Attributes where Atlantis and Glean differ
AttributeAtlantisGlean
Starting priceFreeOn request
Pricing modelOpen source, no licence feeQuote
Free tierYesNo
PlatformsLinux, Self-hostedWeb
CategoryDeveloper ToolsBusiness Intelligence

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 Atlantis

  • Pull request plans
  • Comment driven apply
  • Workspace locking
  • Policy checking
  • Multi-platform webhooks
  • Custom workflows

Only in Glean

Nothing recorded that Atlantis does not also cover.

What people use each for

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

Atlantis

  • Making Terraform review meaningful by putting the actual plan output in front of the approvernot Glean
  • Removing local applies and the credential sprawl that comes with every engineer holding production keysnot Glean
  • Getting pull request driven infrastructure without paying a per-user subscription for a hosted platformnot Glean
  • Enforcing Conftest policies as a blocking check before an apply can runnot Glean

Glean

  • Onboarding new employees across distributed teams to company knowledgenot Atlantis
  • Maintaining centralized searchable intranet for compliance requirementsnot Atlantis
  • Surfacing historical archived content for editorial and sales teamsnot Atlantis
  • Creating AI agents through natural language without engineersnot Atlantis
  • Reducing language model costs by filtering unnecessary datanot Atlantis

Where each one falls short

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

Atlantis

  • There is no company, no service level agreement and no paid support at any price, and the six maintainers are volunteers with day jobs, which some risk committees will not accept for a component holding production cloud credentials
  • The security surface is inherently sharp, because it is an internet-reachable webhook endpoint that executes applies with privileged credentials, gated by pull request comment authorisation that is coarse next to a real policy engine
  • It is stateful, holding a working directory and lock database on local disk, so high availability and horizontal scaling are awkward and you own upgrades, webhook plumbing, secret rotation and the host itself
  • It lacks the features that distinguish the commercial alternatives, with no native drift detection, no cost estimation, no managed state interface and no policy engine beyond the Conftest integration
  • Terragrunt and monorepo layouts are not first-class, requiring hand-written custom workflows and repository configuration that becomes a growing maintenance burden as the number of repositories increases

Glean

  • No pricing published on website; enterprise sales model requires demo request

Pricing, plan by plan

Atlantis

Free
  • AtlantisFree
    • Apache-2.0, no usage limits and no seat count
    • No commercial edition and no paid support tier
    • Community support through GitHub and the CNCF Slack channel

Glean

On request

No published plan breakdown. See the Glean review.

Which should you pick?

Choose Atlantis if

  • You need pull request plans.
  • You want to start without paying.
  • You work on Linux, Self-hosted.
  • You also want comment driven apply.
Atlantis review

Choose Glean if

Nothing in the data separates Glean from Atlantis on the points above - pick on price and on how each one feels to use.

Glean review

Questions people ask

Is Atlantis or Glean better?
Neither clearly leads. Atlantis starts at Free and Glean at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Atlantis or Glean?
Atlantis has a free tier; the other does not. Paid plans start at Free for Atlantis and On request for Glean.
Does Atlantis or Glean run on more platforms?
Atlantis runs on Linux, Self-hosted. Glean runs on Web.
Can I use Atlantis for free?
Yes. Atlantis has a free tier, so you can try it without paying. Glean starts at On request.
What is Atlantis best used for?
Atlantis is most often used for making terraform review meaningful by putting the actual plan output in front of the approver, removing local applies and the credential sprawl that comes with every engineer holding production keys, getting pull request driven infrastructure without paying a per-user subscription for a hosted platform, enforcing conftest policies as a blocking check before an apply can run. Of those, making terraform review meaningful by putting the actual plan output in front of the approver and removing local applies and the credential sprawl that comes with every engineer holding production keys are not what Glean is typically brought in for.
What can Atlantis do that Glean cannot?
Atlantis covers Pull request plans, Comment driven apply, Workspace locking, Policy checking.

Answered from the vendors’ own pages

Atlantis: Is there a company behind Atlantis?

No. It runs as a series of LF Projects under the Linux Foundation and is maintained by volunteers. There is no vendor to buy support from and no service level agreement.

Glean: How much does Glean cost?

Glean does not publish pricing on its website. The platform uses an enterprise sales model where customers request a demo and pricing is determined through direct consultation with the sales team.

Source
Atlantis: Is it a CNCF project?

No. It uses a channel in the CNCF Slack, which is often misread as membership, but the project sits under LF Projects rather than the CNCF.

Glean: Does Glean offer a free tier or trial?

No free tier information is available on Glean's website. Interested users must request a demo to learn about trial options and pricing.

Source
Atlantis: Does it work with OpenTofu?

Yes, there is a dedicated integration guide alongside Terraform, and it also has configuration for working with hosted Terraform backends.

Atlantis: What does it not do that a paid platform does?

Drift detection, cost estimation, a managed state and run interface, and a real policy engine. Atlantis does pull request plan and apply well and stops there.

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