Developer Tools · head to head
Atlantis vs Microsoft Defender
Atlantis
Developer Tools
Runs Terraform plan and apply from pull request comments, self-hosted and free
- From
- Free
- Free plan
- Yes
Microsoft Defender
Cybersecurity
Always-on protection for you and your family's data and devices
- From
- $12/month
- Free plan
- No
The short version
- Only Atlantis has a free tier, so it costs nothing to try first.
- Each has a real cost: 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.; Microsoft Defender defender Suite requires existing Microsoft 365 E3 or equivalent base licensing
- Prices and features above were last checked on 31 August 2026.
Where they differ
Only the attributes on which Atlantis and Microsoft Defender actually diverge.
| Attribute | Atlantis | Microsoft Defender |
|---|---|---|
| Starting price | Free | $12/month |
| Pricing model | Open source, no licence fee | subscription |
| Free tier | Yes | No |
| Platforms | Linux, Docker, Kubernetes, Self-hosted | Web |
| Category | Developer Tools | Cybersecurity |
Identical on both: 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 Atlantis
- Pull request plans
- Comment driven apply
- Workspace locking
- Policy checking
- Multi-platform webhooks
- Custom workflows
Only in Microsoft Defender
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 Microsoft Defender
- Removing local applies and the credential sprawl that comes with every engineer holding production keysnot Microsoft Defender
- Getting pull request driven infrastructure without paying a per-user subscription for a hosted platformnot Microsoft Defender
- Enforcing Conftest policies as a blocking check before an apply can runnot Microsoft Defender
Microsoft Defender
- Endpoint security and threat protectionnot Atlantis
- Identity and access securitynot Atlantis
- Email threat protectionnot Atlantis
- SaaS application security monitoringnot 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.
Microsoft Defender
- Defender Suite requires existing Microsoft 365 E3 or equivalent base licensing
- Some Defender products use pay-as-you-go pricing with variable costs
- Prices vary based on Microsoft agreements, requiring sales contact for custom quotes
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
Microsoft Defender
$12/month- Microsoft Defender Suite$12/month
- Endpoint protection
- Identity threat detection
- Email security
- Microsoft 365 E5 with Defender$60/month
- Includes Defender Suite
- Microsoft Teams included
- Comprehensive security and compliance
- Microsoft Defender Vulnerability Management Add-on$2/month
- Vulnerability scanning and management
- One-month free trial available
- Annual commitment required
Which should you pick?
Choose Atlantis if
- You need pull request plans.
- You want to start without paying.
- You work on Linux, Docker, Kubernetes, Self-hosted.
- You also want comment driven apply.
Choose Microsoft Defender if
Nothing in the data separates Microsoft Defender from Atlantis on the points above - pick on price and on how each one feels to use.
Questions people ask
- Is Atlantis or Microsoft Defender better?
- Neither clearly leads. Atlantis starts at Free and Microsoft Defender at $12/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Atlantis or Microsoft Defender?
- Atlantis has a free tier; the other does not. Paid plans start at Free for Atlantis and $12/month for Microsoft Defender.
- Does Atlantis or Microsoft Defender run on more platforms?
- Atlantis runs on Linux, Docker, Kubernetes, Self-hosted. Microsoft Defender runs on Web.
- Can I use Atlantis for free?
- Yes. Atlantis has a free tier, so you can try it without paying. Microsoft Defender starts at $12/month.
- 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 Microsoft Defender is typically brought in for.
- What can Atlantis do that Microsoft Defender 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.
Microsoft Defender: How much does Microsoft Defender Suite cost?
Microsoft Defender Suite costs $12/user/month (paid yearly), but requires existing Microsoft 365 E3 or equivalent base licensing. It includes endpoint protection, identity threat detection, email security, and SaaS application monitoring.
SourceAtlantis: 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.
Microsoft Defender: What add-ons are available for Microsoft Defender?
Microsoft Defender Vulnerability Management Add-on costs $2/user/month with annual commitment and includes a one-month free trial. Additional pay-as-you-go products include External Attack Surface Management, Cloud Security Posture Management, and Sentinel.
SourceAtlantis: 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.
Microsoft Defender: Is Defender included in Microsoft 365 E5?
Yes, Microsoft Defender Suite is included in Microsoft 365 E5 at $60/user/month (paid yearly with Teams). Prices may vary based on Microsoft agreements, requiring contact with Sales for customized quotes.
SourceAtlantis: 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.
Related pages
More on Microsoft Defender
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