Developer Tools · head to head
Atlantis vs MongoDB
Atlantis
Developer Tools
Runs Terraform plan and apply from pull request comments, self-hosted and free
- From
- Free
- Free plan
- Yes
The short version
- 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.; MongoDB 16 MB maximum document size limits large single objects
- They diverge on capability: Atlantis covers Pull request plans, MongoDB covers Document model.
- Prices and features above were last checked on 31 August 2026.
Where they differ
Only the attributes on which Atlantis and MongoDB actually diverge.
Identical on both: starting price (Free), 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 Atlantis
- Pull request plans
- Comment driven apply
- Workspace locking
- Policy checking
- Multi-platform webhooks
- Custom workflows
Only in MongoDB
- Document model
- Distributed architecture
- ACID transactions
- Real-time analytics
- Full-text search
- Time series data
- Geospatial queries
- Aggregation framework
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 MongoDB
- Removing local applies and the credential sprawl that comes with every engineer holding production keysnot MongoDB
- Getting pull request driven infrastructure without paying a per-user subscription for a hosted platformnot MongoDB
- Enforcing Conftest policies as a blocking check before an apply can runnot MongoDB
MongoDB
- Mobile applicationsnot Atlantis
- Content managementnot Atlantis
- Real-time analyticsnot Atlantis
- IoT applicationsnot Atlantis
- Gaming backendsnot 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.
MongoDB
- 16 MB maximum document size limits large single objects
- No native JOIN support for relational data operations
- Higher memory usage due to storing field names with each document
- Eventual consistency in distributed deployments can cause data stale reads
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
MongoDB
Free- M0Free
- 512 MB storage
- Learning and exploration
- M2$9/month
- 2 GB storage
- Development and testing
- M5$25/month
- 5 GB storage
- M10+$56.94/month
- Dedicated clusters for production
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 MongoDB if
- You need document model.
- You want to start without paying.
- You work on Cloud (Atlas), Self-hosted, Multi-cloud (AWS, Google Cloud, Azure).
- You also want distributed architecture.
Questions people ask
- Is Atlantis or MongoDB better?
- Neither clearly leads. Atlantis starts at Free and MongoDB at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Atlantis or MongoDB?
- Atlantis starts at Free and MongoDB at Free.
- Does Atlantis or MongoDB run on more platforms?
- Atlantis runs on Linux, Docker, Kubernetes, Self-hosted. MongoDB runs on Cloud (Atlas), Self-hosted, Multi-cloud (AWS, Google Cloud, Azure).
- Can I use Atlantis for free?
- Both have a free tier, so you can try either at no cost before committing.
- 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 MongoDB is typically brought in for.
- What can Atlantis do that MongoDB cannot?
- Atlantis covers Pull request plans, Comment driven apply, Workspace locking, Policy checking. MongoDB covers Document model, Distributed architecture, ACID transactions, Real-time analytics.
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.
MongoDB: Does MongoDB offer a free tier?
Yes. MongoDB Atlas offers an M0 free tier with 512 MB storage for learning and exploration, plus paid options starting at $9/month for M2 with 2 GB storage.
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.
MongoDB: Can I self-host MongoDB?
Yes. You can run MongoDB Community Edition on your own servers, or use MongoDB Enterprise Advanced for self-managed production deployments with enterprise features.
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.
MongoDB: What is the maximum document size in MongoDB?
Documents are limited to 16 MB. For documents exceeding this limit, you can use MongoDB's GridFS API to store files larger than the maximum size.
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.
MongoDB: Does MongoDB support ACID transactions?
Yes. MongoDB supports ACID transactions within a single document by default, and multi-document ACID transactions are available for replica sets and sharded clusters in MongoDB 4.0+.
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