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Developer Tools · head to head

GNAT Pro vs MongoDB Atlas

GNAT Pro logo

GNAT Pro

Developer Tools

Software development environments and toolchains for Ada, C/C++ and Rust

From
On request
Free plan
No
Full reviewWebsite
MongoDB Atlas logo

MongoDB Atlas

Technology

The multi-cloud developer data platform

From
Free
Free plan
Yes
Full reviewWebsite

The short version

  • Only MongoDB Atlas has a free tier, so it costs nothing to try first.
  • Each has a real cost: GNAT Pro no pricing published on website; requires contacting AdaCore directly for quotes; MongoDB Atlas m0 free tier limited to learning and exploration only with no backup capability
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which GNAT Pro and MongoDB Atlas actually diverge.

Attributes where GNAT Pro and MongoDB Atlas differ
AttributeGNAT ProMongoDB Atlas
Starting priceOn requestFree
Pricing modelquoteusage-based
Free tierNoYes
CategoryDeveloper ToolsTechnology

Identical on both: platforms (Web), user rating (Not yet rated).

What people use each for

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

GNAT Pro

  • Building certified avionics software meeting DO-178B/C standardsnot MongoDB Atlas
  • Developing automotive embedded systems with ISO-26262 compliancenot MongoDB Atlas
  • Integrating Ada, C/C++, and Rust components in single codebasenot MongoDB Atlas
  • Managing software supply chain vulnerabilities and SBOMsnot MongoDB Atlas
  • Supporting long-lived software systems spanning decadesnot MongoDB Atlas

MongoDB Atlas

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

Where each one falls short

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

GNAT Pro

  • No pricing published on website; requires contacting AdaCore directly for quotes
  • Vendor indicates per-user, per-year subscription model but does not disclose specific costs

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

GNAT Pro

On request

No published plan breakdown. See the GNAT Pro review.

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/month
    • 2 GB storage
    • Shared RAM and vCPU
  • M5 Shared$25/month
    • 5 GB storage
    • Shared RAM and vCPU

Which should you pick?

Choose GNAT Pro if

Nothing in the data separates GNAT Pro from MongoDB Atlas on the points above - pick on price and on how each one feels to use.

GNAT Pro review

Choose MongoDB Atlas if

  • You want to start without paying.
MongoDB Atlas review

Questions people ask

Is GNAT Pro or MongoDB Atlas better?
Neither clearly leads. GNAT Pro starts at On request and MongoDB Atlas at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, GNAT Pro or MongoDB Atlas?
MongoDB Atlas has a free tier; the other does not. Paid plans start at On request for GNAT Pro and Free for MongoDB Atlas.
Does GNAT Pro or MongoDB Atlas run on more platforms?
Both run on Web, so platform support will not decide this one for you.
Can I use MongoDB Atlas for free?
Yes. MongoDB Atlas has a free tier, so you can try it without paying. GNAT Pro starts at On request.
What is GNAT Pro best used for?
GNAT Pro is most often used for building certified avionics software meeting do-178b/c standards, developing automotive embedded systems with iso-26262 compliance, integrating ada, c/c++, and rust components in single codebase, managing software supply chain vulnerabilities and sboms. Of those, building certified avionics software meeting do-178b/c standards and developing automotive embedded systems with iso-26262 compliance are not what MongoDB Atlas is typically brought in for.

Answered from the vendors’ own pages

GNAT Pro: How much does GNAT Pro cost?

GNAT Pro pricing is not published on the website. Customers must request a pricing quote by contacting AdaCore directly or speaking with a GNAT Pro expert.

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
GNAT Pro: What is GNAT Pro licensing model?

GNAT Pro is sold on a per-user, per-year basis with no license locks. Customers can request pricing for their specific needs.

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
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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