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Developer Tools · head to head

GNAT Pro vs QuestDB

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
QuestDB logo

QuestDB

Databases

Fast open source time-series database for high throughput ingestion

From
Free
Free plan
Yes
Visit QuestDBFull review

The short version

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

Where they differ

Only the attributes on which GNAT Pro and QuestDB actually diverge.

Attributes where GNAT Pro and QuestDB differ
AttributeGNAT ProQuestDB
Starting priceOn requestFree
Pricing modelQuoteOpen-source
Free tierNoYes
PlatformsWebSelf-hosted, Web
CategoryDeveloper ToolsDatabases

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 GNAT Pro

Nothing recorded that QuestDB does not also cover.

Only in QuestDB

  • High Throughput Ingestion
  • SQL Support
  • Time-series Optimization
  • SIMD Vectorization
  • Column-oriented Storage
  • Built-in Web Console
  • InfluxDB Line Protocol
  • PostgreSQL

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 QuestDB
  • Developing automotive embedded systems with ISO-26262 compliancenot QuestDB
  • Integrating Ada, C/C++, and Rust components in single codebasenot QuestDB
  • Managing software supply chain vulnerabilities and SBOMsnot QuestDB
  • Supporting long-lived software systems spanning decadesnot QuestDB

QuestDB

  • Time-series analytics ingesting up to 20M rows/second from IoT sensors or financial data feedsnot GNAT Pro
  • Real-time dashboarding with 32ms time-to-first-row latency for minute-level analyticsnot GNAT Pro
  • Applications requiring multi-tier storage (hot ingest, real-time SQL, cold Parquet archive)not 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

QuestDB

  • Open-source edition lacks high-availability, distributed architecture, and enterprise security features
  • Enterprise edition pricing not published; requires contacting sales for custom quote
  • Ingestion limit of 20M rows/sec platform-dependent; may not scale to extreme throughput requirements

Pricing, plan by plan

GNAT Pro

On request

No published plan breakdown. See the GNAT Pro review.

QuestDB

Free

No published plan breakdown. See the QuestDB review.

Which should you pick?

Choose GNAT Pro if

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

GNAT Pro review

Choose QuestDB if

  • You need high throughput ingestion.
  • You want to start without paying.
  • You work on Self-hosted, Web.
  • You also want sql support.
QuestDB review

Questions people ask

Is GNAT Pro or QuestDB better?
Neither clearly leads. GNAT Pro starts at On request and QuestDB at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, GNAT Pro or QuestDB?
QuestDB has a free tier; the other does not. Paid plans start at On request for GNAT Pro and Free for QuestDB.
Does GNAT Pro or QuestDB run on more platforms?
GNAT Pro runs on Web. QuestDB runs on Self-hosted, Web.
Can I use QuestDB for free?
Yes. QuestDB 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 QuestDB is typically brought in for.
What can GNAT Pro do that QuestDB cannot?
QuestDB covers High Throughput Ingestion, SQL Support, Time-series Optimization, SIMD Vectorization.

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
QuestDB: How much does QuestDB Enterprise cost?

QuestDB does not publish specific pricing for the Enterprise tier. Customers must contact QuestDB via their enterprise contact form to receive a custom quote.

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
QuestDB: Does QuestDB offer a free version?

Yes, QuestDB Open Source is completely free and recommended for evaluation, prototyping, and pilot projects. Enterprise features, high availability, security, and dedicated support require the paid Enterprise tier.

Source
QuestDB: What deployment options does QuestDB offer?

QuestDB offers open source deployment, Enterprise deployment, and Bring Your Own Cloud (BYOC) deployment. Pricing details for BYOC and Enterprise tiers are not published and require direct contact with sales.

Source
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