# CockroachDB vs MongoDB Atlas (2026)

By Noah — last updated & pricing verified October 23, 2026.

> **Verdict:** Choose CockroachDB if you need PostgreSQL-compatible distributed SQL that replicates all data three times to survive node, datacenter, and region failures, with the option to self-host or run in your own cloud account. Choose MongoDB Atlas if you build on a flexible JSON-like document schema and want a managed service with a forever-free M0 cluster, built-in Vector Search and full-text search, and dedicated clusters from $0.08/hour. The deciding factor is the data model and entry cost: CockroachDB is relational SQL with no permanent free tier for new Cloud sign-ups, while MongoDB Atlas is a document database that starts free.

**Choose CockroachDB if:** Your application is relational and uses PostgreSQL drivers or ORMs, which connect to CockroachDB over the PostgreSQL wire protocol without modification; Your transactional workload must survive node, datacenter, or region failures without manual sharding, which CockroachDB handles through automatic 3x replication; You want to self-host the database or have Cockroach Labs manage it inside your own cloud account (Bring Your Own Cloud) instead of using only a vendor-hosted service; Your business earns under $10M a year and can run self-hosted CockroachDB on the free Enterprise Free license, which requires telemetry reporting; You need PCI DSS and HIPAA controls, customer-managed encryption keys, and dedicated infrastructure, which CockroachDB Cloud Mission Critical includes from $0.162/vCPU-hour

**Choose MongoDB Atlas if:** Your data fits a flexible JSON-like document schema better than relational tables; You want a permanent free cluster for learning and small projects, since MongoDB Atlas M0 is free forever with 512 MB of storage; You are building AI retrieval or search features and want Vector Search and Atlas Search on the same cluster as your primary data; You want a cheap production entry point, with a dedicated MongoDB Atlas M10 cluster at $0.08/hour (about $58/month) versus about $203/month for CockroachDB Standard with 2 vCPUs; You need Kafka-based stream processing or Data Federation queries across Atlas clusters and S3 buckets

## At a glance

|  | CockroachDB | MongoDB Atlas |
| --- | --- | --- |
| Pricing | Free tier · paid from $203/mo | Free |
| License | Freemium | Freemium |
| Best for | teams running multi-region transactional workloads on PostgreSQL-compatible SQL that need automatic failover without manual sharding | developers and teams building on a flexible document schema who want a managed, multi-cloud MongoDB deployment instead of self-hosting |
| Ratings | Product Hunt 4.7/5 (3 reviews) | — |

## Feature comparison

| Feature | CockroachDB | MongoDB Atlas |
| --- | --- | --- |
| Data model | Yes (distributed SQL, PostgreSQL wire-compatible) | Yes (document database storing JSON-like documents) |
| Free tier | Partial (30-day trial with $400 credit for new Cloud sign-ups) | Yes (M0 free forever (512 MB, up to 100 ops/sec)) |
| Entry paid tier | Yes (Standard from $0.092/vCPU-hour (about $203/mo for 2 vCPUs, 100 GB)) | Yes (Flex from $0.011/hour (about $8/mo), up to 5 GB storage) |
| Dedicated production cluster | Yes (Mission Critical from $0.162/vCPU-hour (about $1,528/mo for 12 vCPUs)) | Yes (M10 at $0.08/hour (about $58/mo); M50 at $2.00/hour) |
| Self-hosting | Yes (free license under $10M annual revenue; paid Enterprise license above) | No (managed service only; self-hosted MongoDB loses Atlas tooling) |
| Bring your own cloud account | Yes (Cockroach Labs manages it inside your cloud account) | Unknown |
| Cloud providers | Yes (AWS, GCP, and Azure (Azure on Mission Critical)) | Yes (AWS, Google Cloud, and Azure from one console) |
| Platforms | Yes (web console; self-hosted on Linux and macOS) | Partial (web console only (managed service)) |
| License | Partial (proprietary source-available since version 24.3) | Partial (proprietary service on the SSPL-licensed MongoDB server) |
| Region-failure survival without manual sharding | Yes (automatic 3x replication across nodes and regions) | Unknown |
| Full-text and vector search | Unknown | Yes (Atlas Search and Vector Search on the same cluster) |
| Stream processing and data federation | Unknown | Yes (Kafka stream processing; queries across clusters and S3) |
| Compliance controls | Yes (PCI DSS, HIPAA controls, and CMEK on Mission Critical) | Unknown |
| Auto-scaling and automated backups | Unknown | Yes (both included on the managed service) |
| Pricing predictability | Partial (hourly per-vCPU billing) | Partial (hourly cluster rates plus search, data transfer, and backup fees) |
| External rating | Yes (4.7/5 from 3 reviews (Product Hunt)) | Unknown |

## CockroachDB vs MongoDB Atlas pricing: which costs less?

MongoDB Atlas costs less to start, with a forever-free M0 cluster, Flex from about $8/month, and a dedicated M10 cluster at about $58/month, while new CockroachDB Cloud sign-ups get a 30-day trial with $400 credit and then pay from $0.092/vCPU-hour, about $203/month for 2 vCPUs and 100 GB.

At larger sizes the two converge: a MongoDB Atlas M50 cluster with 8 dedicated vCPUs and 32 GB RAM runs $2.00/hour, about $1,460/month, and CockroachDB Mission Critical is about $1,528/month for 12 vCPUs and 100 GB. Both bill hourly, and Atlas adds separate charges for search nodes, data transfer, and backup storage. CockroachDB's free Basic tier and its older $0.18/hour Standard and $0.60/hour Advanced rates apply only to clusters created before September 15, 2026. Self-hosted CockroachDB is free for businesses under $10M in annual revenue.

## Which handles failures and scale better, CockroachDB or MongoDB Atlas?

CockroachDB is built specifically for failure survival, replicating every piece of data three times so a cluster survives node, datacenter, and region failures without manual sharding, while the MongoDB Atlas listing focuses on managed scaling through auto-scaling, automated backups, and clusters up to M700 with 96 vCPUs and 768 GB RAM.

CockroachDB distributes and rebalances data across nodes on its own, which suits transactional, multi-region workloads that cannot tolerate downtime. MongoDB Atlas takes provisioning, patching, backups, and scaling off the team's hands across AWS, Google Cloud, and Azure. The MongoDB Atlas listing data does not describe its replication or region-failure behavior, so teams with strict survivability requirements should verify Atlas's guarantees directly.

## Is CockroachDB or MongoDB Atlas open source?

Neither is open source: self-hosted CockroachDB has run under a proprietary source-available license since version 24.3, and MongoDB Atlas is a proprietary managed service built on the SSPL-licensed MongoDB server.

CockroachDB clusters without a valid license, or past their trial or grace period, are throttled to five concurrent SQL transactions. CockroachDB's Enterprise Free license requires telemetry and cannot be used to host CockroachDB as a service for third parties. MongoDB Atlas cannot be self-hosted at all; running the MongoDB server yourself means giving up Atlas's managed tooling.

## Can MongoDB Atlas replace CockroachDB?

MongoDB Atlas can replace CockroachDB only for teams willing to move from relational SQL to a document model, because Atlas stores JSON-like documents instead of rows and tables and CockroachDB's PostgreSQL compatibility would not carry over.

Teams that switch gain a forever-free tier, cheaper entry clusters, and Vector Search, Atlas Search, stream processing, and Data Federation on one service. Those teams give up PostgreSQL driver and ORM compatibility, self-hosting and Bring Your Own Cloud options, and the PCI DSS and HIPAA controls that CockroachDB documents on Mission Critical.

## Strengths and weaknesses

### CockroachDB

- Pro: Automatic 3x replication survives node, datacenter, and region failures without manual intervention.
- Pro: PostgreSQL wire-compatible, so most Postgres drivers and ORMs work without modification.
- Pro: Mission Critical offers a 99.999% multi-region SLA with CMEK, PCI DSS, and HIPAA controls across AWS, GCP, and Azure.
- Pro: The self-hosted Enterprise Free license gives organizations under $10M in annual revenue every Enterprise feature at no cost.
- Pro: Runs as a managed cloud service, inside your own AWS, GCP, or Azure account (BYOC), or fully self-hosted.
- Con: No free cloud tier for organizations created on or after September 15, 2026; only a 30-day trial with $400 in credit.
- Con: No longer open source as of version 24.3; self-hosted runs under the proprietary CockroachDB Software License.
- Con: Enterprise Free requires sending telemetry, and unlicensed or non-reporting self-hosted clusters are throttled to five concurrent transactions.
- Con: Cloud billing tracks provisioned vCPUs, storage, backups, and data transfer, so idle clusters keep costing money and monthly costs take effort to estimate.

### MongoDB Atlas

- Pro: Free M0 tier is genuinely free forever, not a time-limited trial.
- Pro: Multi-cloud deployment across AWS, Google Cloud, and Azure from one console.
- Pro: Vector Search and full-text search run on the same cluster as the primary data, avoiding a separate search infrastructure.
- Pro: Auto-scaling and automated backups reduce operational overhead versus self-hosted MongoDB.
- Con: Pricing is spread across cluster hourly rates, search node rates, data transfer, and backup storage, making total monthly cost hard to estimate without the calculator.
- Con: Free and Flex tiers cap storage low (512 MB and 5 GB respectively), forcing an early upgrade to dedicated clusters for real workloads.
- Con: Document-model flexibility can lead to inconsistent schemas across a codebase without added application-level discipline.
- Con: Atlas itself is a proprietary managed service; self-hosting the open-source-adjacent MongoDB server separately means losing Atlas's managed tooling.

## Which fits your use case?

| Use case | Pick | Why |
| --- | --- | --- |
| Fintech team running multi-region transactional workloads on Postgres tooling | CockroachDB | CockroachDB speaks the PostgreSQL wire protocol and replicates data three times to survive region failures, with PCI DSS controls on Mission Critical. |
| Startup prototyping an app on a zero budget | MongoDB Atlas | MongoDB Atlas M0 is free forever with 512 MB of storage, while new CockroachDB Cloud sign-ups get only a 30-day trial with $400 credit. |
| Team adding AI retrieval or semantic search to an app | MongoDB Atlas | MongoDB Atlas runs Vector Search and Atlas Search on the same cluster as the primary data, so no separate vector or search database is needed. |
| Company that must keep its database in its own cloud account or data center | CockroachDB | CockroachDB offers Bring Your Own Cloud and self-hosted deployments; MongoDB Atlas is a managed service only. |
| Healthcare or payments workload that needs HIPAA or PCI DSS controls | CockroachDB | CockroachDB Cloud Mission Critical includes PCI DSS and HIPAA controls plus customer-managed encryption keys; the MongoDB Atlas listing data does not state compliance controls. |
| Small production app that needs a dedicated cluster on a tight budget | MongoDB Atlas | A MongoDB Atlas M10 cluster costs $0.08/hour, about $58/month, against about $203/month for CockroachDB Standard with 2 vCPUs and 100 GB. |

## Migration FAQ

### Should I use CockroachDB or MongoDB Atlas?

Use CockroachDB if you need PostgreSQL-compatible SQL that survives region failures and can be self-hosted; use MongoDB Atlas if you want a managed document database with a free tier and built-in vector and full-text search.

### Is CockroachDB cheaper than MongoDB Atlas?

No, MongoDB Atlas is cheaper to start: M0 is free forever and a dedicated M10 cluster costs about $58/month, while CockroachDB Cloud Standard starts at about $203/month for 2 vCPUs and 100 GB after a 30-day trial. Self-hosted CockroachDB is free for businesses under $10M in annual revenue.

### Can MongoDB Atlas replace CockroachDB?

Only if you are willing to move from relational SQL to a document model. Applications built on PostgreSQL drivers and ORMs connect to CockroachDB without changes, while MongoDB Atlas stores JSON-like documents instead of rows and tables.

### Does CockroachDB still have a free tier?

Not for new Cloud sign-ups: CockroachDB Cloud organizations created on or after September 15, 2026 get a 30-day trial with $400 credit instead. The free Basic tier of 50 million request units and 10 GiB per month remains only for clusters created before that date, and self-hosted CockroachDB is free for businesses under $10M in annual revenue.

### Is CockroachDB open source?

No, self-hosted CockroachDB has run under a proprietary source-available license since version 24.3, and unlicensed clusters are throttled to five concurrent SQL transactions after a grace period. MongoDB Atlas is also proprietary, built on the SSPL-licensed MongoDB server.

## Neither a match?

- 3 alternatives to CockroachDB: https://findalternative.to/cockroachdb
- 4 alternatives to MongoDB Atlas: https://findalternative.to/mongodb-atlas

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