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Databases · head to head

Google Cloud SQL vs MongoDB Atlas

Google Cloud SQL logo

Google Cloud SQL

Databases

Fully managed relational database service for MySQL, PostgreSQL, and SQL Server

From
Free
Free plan
Yes
Visit Google Cloud SQLFull review
MongoDB Atlas logo

MongoDB Atlas

Databases

The multi-cloud developer data platform

From
Free
Free plan
Yes
Visit MongoDB AtlasFull review

The short version

  • Free plans on both; paid from $25/mo and $0.011/mo.
  • Where Google Cloud SQL falls short: locked into Google Cloud ecosystem with limited cross-cloud portability.
  • Where MongoDB Atlas falls short: M0 free tier limited to learning and exploration only with no backup capability.
  • Prices and features on this page were last checked on 13 November 2026.

Where they differ

Only the attributes on which Google Cloud SQL and MongoDB Atlas actually diverge.

On every field we record, Google Cloud SQL and MongoDB Atlas match. The differences are in what each one covers, below.

Identical on both: starting price (Free), pricing model (Usage-based), free tier (Yes), platforms (Web), category (Databases).

Not yet recorded: founded for MongoDB Atlas.

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 Google Cloud SQL

  • High Availability
  • Automated Backups
  • Point-in-time Recovery
  • Encryption
  • Regional/Zonal Instances
  • Read Replicas
  • Private IP
  • BigQuery

Only in MongoDB Atlas

Nothing recorded that Google Cloud SQL does not also cover.

What people use each for

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

Google Cloud SQL

  • Transaction processingnot MongoDB Atlas
  • Data storagenot MongoDB Atlas
  • Application backendnot MongoDB Atlas
  • Reportingnot MongoDB Atlas
  • Data analyticsnot MongoDB Atlas

MongoDB Atlas

  • Building applications with flexible JSON document storagenot Google Cloud SQL
  • Performing full-text and vector search on unstructured datanot Google Cloud SQL
  • Scaling multi-cloud deployments across AWS, Azure, GCPnot Google Cloud SQL
  • Streaming event data integration with Kafkanot Google Cloud SQL

Where each one falls short

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

Google Cloud SQL

  • Locked into Google Cloud ecosystem with limited cross-cloud portability
  • Pay-as-you-go pricing can become expensive with unpredictable workloads
  • Limited customization options compared to self-managed databases

MongoDB Atlas

  • M0 free tier limited to learning and exploration only with no backup capability
  • Data transfer egress charges apply at 0.12 USD/GB for dedicated clusters; inbound free
  • MongoDB Search and Vector Search add significant per-hour costs starting at 0.12 USD/hour

Pricing, plan by plan

Google Cloud SQL

Free
  • Free TierFree
    • db-f1-micro instance
    • 30GB storage
    • Limited usage
  • Standard$25/mo
    • High availability
    • Automated backups
    • Point-in-time recovery

MongoDB Atlas

Free
  • M0 (Free Tier)Free
    • 512 MB storage
    • Shared RAM and vCPU
    • No backups
  • Flex Tier$0.011/hour
    • 5 GB storage
    • Shared RAM and vCPU
    • Pay-as-you-go hourly billing
  • M2 Shared$9/mo
    • 2 GB storage
    • Shared RAM and vCPU
  • M5 Shared$25/mo
    • 5 GB storage
    • Shared RAM and vCPU

Which should you pick?

Choose Google Cloud SQL if

  • You need high availability.
  • You want to start without paying.
  • You also want automated backups.
Google Cloud SQL review

Choose MongoDB Atlas if

  • You want to start without paying.
MongoDB Atlas review

Questions people ask

Is Google Cloud SQL or MongoDB Atlas better?
Neither clearly leads. Google Cloud SQL starts at Free and MongoDB Atlas at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Google Cloud SQL or MongoDB Atlas?
Google Cloud SQL starts at Free and MongoDB Atlas at Free.
Does Google Cloud SQL or MongoDB Atlas run on more platforms?
Both run on Web, so platform support will not decide this one for you.
Can I use Google Cloud SQL for free?
Both have a free tier, so you can try either at no cost before committing.
What is Google Cloud SQL best used for?
Google Cloud SQL is most often used for transaction processing, data storage, application backend, reporting. Of those, transaction processing and data storage are not what MongoDB Atlas is typically brought in for.
What can Google Cloud SQL do that MongoDB Atlas cannot?
Google Cloud SQL covers High Availability, Automated Backups, Point-in-time Recovery, Encryption.

Answered from the vendors’ own pages

Google Cloud SQL: What database engines does Google Cloud SQL support?

Google Cloud SQL supports MySQL, PostgreSQL, and SQL Server. Users can choose their preferred engine when provisioning an instance and Google handles automated backups, replication, patching, and scaling.

Source
MongoDB Atlas: How much does MongoDB Atlas cost?

MongoDB Atlas offers a free M0 tier with 512 MB storage, Flex tier at approximately 8-30 USD/month with pay-per-hour billing, shared clusters at 9-25 USD/month, and dedicated clusters from 56.94 USD/month. Add-on services like MongoDB Search cost 0.12-3.27 USD/hour.

Source
Google Cloud SQL: Does Google Cloud SQL have a free tier?

Google Cloud SQL does not have a free tier, though new users receive free trial credits from Google Cloud Platform. Pricing is based on compute resources (CPU and memory) and storage used, with options for committed use discounts.

Source
MongoDB Atlas: Is there a free tier?

Yes, MongoDB Atlas M0 free tier offers 512 MB storage with shared resources, suitable for learning and exploration. Flex tier allows pay-as-you-go usage starting at 0.011 USD/hour.

Source
Google Cloud SQL: Can Google Cloud SQL scale automatically?

Yes. Cloud SQL automatically scales database storage and compute resources to handle increased workloads without manual intervention, and includes automated backups and high availability configurations.

Source
MongoDB Atlas: What are the data transfer limits?

Inbound data transfer is typically free; egress from dedicated clusters costs 0.12 USD/GB. Free and Flex tiers do not incur data transfer charges.

Source
MongoDB Atlas: What backup options are available?

M0 free tier and Flex tier do not include backups. Dedicated clusters M10 and above include backup services with region and snapshot storage-based pricing.

Source
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