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APIs · head to head

Kong Gateway vs TestNG

Kong Gateway logo

Kong Gateway

APIs

Open-source and cloud API gateway for managing microservices traffic

From
Free
Rated
-
Full reviewWebsite
TestNG logo

TestNG

Testing

Java testing framework created by Cedric Beust, still actively maintained but effectively a single-lead project

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Kong Gateway the free open-source gateway lacks the analytics, portals, and support of the paid Konnect tiers.; TestNG maintainership is concentrated around creator Cedric Beust rather than a broad team or foundation, which is a real continuity risk compared to JUnit's independent team or Jest's foundation backing.
  • They diverge on capability: Kong Gateway covers API request routing, TestNG covers Test dependencies.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which Kong Gateway and TestNG actually diverge.

Attributes where Kong Gateway and TestNG differ
AttributeKong GatewayTestNG
Pricing modelfreemiumOpen source, no licence fee
Platformsweb, linux, apiLinux, macOS, Windows
CategoryAPIsTesting
Founded2017Unknown

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated).

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 Kong Gateway

  • API request routing
  • Plugin ecosystem
  • Developer portals
  • AI Gateway
  • Analytics and observability
  • SSO and audit logs

Only in TestNG

  • Test dependencies
  • XML suite configuration
  • Native parallel execution
  • Data providers
  • Grouping
  • Flexible reporting

What people use each for

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

Kong Gateway

  • Routing and securing traffic across microservicesnot TestNG
  • Publishing internal or external developer portalsnot TestNG
  • Managing rate limits and authentication at the API edgenot TestNG
  • Gateway-level routing to multiple LLM providersnot TestNG

TestNG

  • A Java integration test suite that needs to skip dependent tests automatically when a prerequisite test failsnot Kong Gateway
  • A team wanting XML-based suite configuration to manage large, grouped test suites without touching code for each runnot Kong Gateway
  • A project needing native parallel test execution at the class or method level without adding a separate pluginnot Kong Gateway
  • A Selenium-based UI test suite that uses TestNG as the underlying runner for grouping and parallelisationnot Kong Gateway

Where each one falls short

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

Kong Gateway

  • The free open-source gateway lacks the analytics, portals, and support of the paid Konnect tiers.
  • Plus tier caps API requests at 1M/month before incurring per-million overage charges.
  • Enterprise pricing is custom and not published, making budgeting harder without sales contact.
  • Configuration and plugin management can require significant operational expertise to run at scale.

TestNG

  • Maintainership is concentrated around creator Cedric Beust rather than a broad team or foundation, which is a real continuity risk compared to JUnit's independent team or Jest's foundation backing.
  • It is a smaller ecosystem than JUnit, so fewer third-party integrations, tutorials and Stack Overflow answers exist for edge cases.
  • XML-based suite configuration, while powerful, is an extra file and syntax to maintain alongside the codebase, which some teams find adds friction JUnit's more code-centric model avoids.
  • There is no commercial support tier or vendor relationship of any kind, unlike JUnit's OpenElements arrangement, so an enterprise wanting a support contract has no route to buy one.
  • Release cadence, while active, is slower and less frequent than JUnit 5's, since it depends on a much smaller pool of active maintainers.

Pricing, plan by plan

Kong Gateway

Free
  • Free TrialFree
    • 30-day enterprise functionality trial
    • Unlimited gateways
    • 30-day analytics retention
  • Plus$undefined/month
    • Up to 5 serverless, 2 hybrid, 2 dedicated cloud gateways
    • 1M API requests/month included
    • Up to 2 developer portals
  • Enterprise$undefined/month
    • Unlimited hybrid and dedicated cloud gateways
    • Unlimited developer portals
    • SSO and audit logs

TestNG

Free
  • TestNGFree
    • Full functionality, no usage limits
    • Community support via GitHub
    • No commercial support tier exists

Which should you pick?

Choose Kong Gateway if

  • You need api request routing.
  • You want to start without paying.
  • You work on web, linux, api.
  • You also want plugin ecosystem.
Kong Gateway review

Choose TestNG if

  • You need test dependencies.
  • You want to start without paying.
  • You work on Linux, macOS, Windows.
  • You also want xml suite configuration.
TestNG review

Questions people ask

Is Kong Gateway or TestNG better?
Neither clearly leads. Kong Gateway starts at Free and TestNG at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Kong Gateway or TestNG?
Kong Gateway starts at Free and TestNG at Free.
Does Kong Gateway or TestNG run on more platforms?
Kong Gateway runs on web, linux, api. TestNG runs on Linux, macOS, Windows.
Can I use Kong Gateway for free?
Both have a free tier, so you can try either at no cost before committing.
What is Kong Gateway best used for?
Kong Gateway is most often used for routing and securing traffic across microservices, publishing internal or external developer portals, managing rate limits and authentication at the api edge, gateway-level routing to multiple llm providers. Of those, routing and securing traffic across microservices and publishing internal or external developer portals are not what TestNG is typically brought in for.
What can Kong Gateway do that TestNG cannot?
Kong Gateway covers API request routing, Plugin ecosystem, Developer portals, AI Gateway. TestNG covers Test dependencies, XML suite configuration, Native parallel execution, Data providers.

Answered from the vendors’ own pages

Kong Gateway: Is Kong Gateway free?

Kong's core gateway is open source and free to self-host. Kong Konnect, the managed cloud platform, offers a 30-day free trial before moving to paid Plus or custom Enterprise pricing.

Source
TestNG: Is TestNG still actively maintained in 2026?

Yes, it continues to receive releases in its 7.x line with support for current Java versions, though maintenance is concentrated around a small team led by its creator.

Kong Gateway: How is usage metered on the Plus plan?

The Plus plan includes 1M API requests per month, with additional usage billed at $200 per extra 1 million requests up to a 10M/month cap, plus per-gateway and per-LLM-model charges.

Source
TestNG: What does TestNG offer that JUnit does not?

Native test dependencies, XML-based suite configuration and built-in parallel execution without needing external plugins, all of which JUnit users typically add via separate libraries.

Kong Gateway: What support is included?

Plus includes email support with a 2-business-day SLA, while Enterprise adds dedicated success managers and professional services.

Source
TestNG: Is there a commercial support option for TestNG?

No, unlike JUnit there is no commercial support arrangement; support is purely community-based through GitHub.

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