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Databases · head to head

Apache Druid vs GNAT Pro

Apache Druid logo

Apache Druid

Databases

Real-time analytics database for sub-second OLAP queries

From
Free
Free plan
Yes
Visit Apache DruidFull review
GNAT Pro logo

GNAT Pro

Developer Tools

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

From
On request
Free plan
No
Visit GNAT ProFull review

The short version

  • Apache Druid is a high performance, real-time analytics database.
  • Apache Druid is free; GNAT Pro prices on request.
  • Where Apache Druid falls short: open-source offering lacks high-availability, distributed architecture, and enterprise security features.
  • Where GNAT Pro falls short: no pricing published on website; requires contacting AdaCore directly for quotes.
  • Prices and features on this page were last checked on 13 November 2026.

Where they differ

Only the attributes on which Apache Druid and GNAT Pro actually diverge.

Attributes where Apache Druid and GNAT Pro differ
AttributeApache DruidGNAT Pro
Starting priceFreeOn request
Pricing modelOpen-sourceQuote
Free tierYesNo
PlatformsSelf-hosted, APIWeb
CategoryDatabasesDeveloper Tools

Not yet recorded: founded for GNAT Pro.

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 Apache Druid

  • Real-time Ingestion
  • Sub-second Queries
  • Column-oriented Storage
  • Streaming Integration
  • Approximate Algorithms
  • Flexible Schemas
  • Time-based Partitioning
  • Kafka

Only in GNAT Pro

Nothing recorded that Apache Druid does not also cover.

What people use each for

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

Apache Druid

  • Real-time analytics platforms ingesting millions of events per second from streaming sourcesnot GNAT Pro
  • Applications requiring sub-second queries over high-cardinality datasets (billions to trillions of rows)not GNAT Pro
  • Time-series and event analysis at massive scale with columnar storage efficiencynot GNAT Pro

GNAT Pro

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

Where each one falls short

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

Apache Druid

  • Open-source offering lacks high-availability, distributed architecture, and enterprise security features
  • Requires native integration with Apache Kafka or Amazon Kinesis for real-time ingestion; custom integrations need development
  • High-concurrency query support (hundreds of thousands QPS) requires significant cluster infrastructure investment

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

Pricing, plan by plan

Apache Druid

Free

No published plan breakdown. See the Apache Druid review.

GNAT Pro

On request

No published plan breakdown. See the GNAT Pro review.

Which should you pick?

Choose Apache Druid if

  • You need real-time ingestion.
  • You want to start without paying.
  • You work on Self-hosted, API.
  • You also want sub-second queries.
Apache Druid review

Choose GNAT Pro if

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

GNAT Pro review

Questions people ask

Is Apache Druid or GNAT Pro better?
Neither clearly leads. Apache Druid starts at Free and GNAT Pro at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Apache Druid or GNAT Pro?
Apache Druid has a free tier; the other does not. Paid plans start at Free for Apache Druid and On request for GNAT Pro.
Does Apache Druid or GNAT Pro run on more platforms?
Apache Druid runs on Self-hosted, API. GNAT Pro runs on Web.
Can I use Apache Druid for free?
Yes. Apache Druid has a free tier, so you can try it without paying. GNAT Pro starts at On request.
What is Apache Druid best used for?
Apache Druid is most often used for real-time analytics platforms ingesting millions of events per second from streaming sources, applications requiring sub-second queries over high-cardinality datasets (billions to trillions of rows), time-series and event analysis at massive scale with columnar storage efficiency. Of those, real-time analytics platforms ingesting millions of events per second from streaming sources and applications requiring sub-second queries over high-cardinality datasets (billions to trillions of rows) are not what GNAT Pro is typically brought in for.
What can Apache Druid do that GNAT Pro cannot?
Apache Druid covers Real-time Ingestion, Sub-second Queries, Column-oriented Storage, Streaming Integration.

Answered from the vendors’ own pages

Apache Druid: Is Apache Druid free to use?

Apache Druid is an open-source project with no licensing fees. It is licensed under CC BY-SA 4.0, and the Druid name and logo are trademarks of The Apache Software Foundation.

Source
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
Apache Druid: Can I use Apache Druid for commercial purposes?

Yes, Apache Druid is open-source software available for commercial use at no cost. The CC BY-SA 4.0 license permits commercial deployment.

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
Apache Druid: Where do I find pricing for commercial support or services?

No pricing or support tiers are published on the Apache Druid homepage. For commercial support options, contact the Apache Druid community or consult additional resources beyond the project website.

Source
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