Testing · head to head
Split vs TestNG
Split
Testing
Feature flags tied to a metrics pipeline that attributes production impact to each release, now Harness FME
- From
- On request
- Rated
- -
TestNG
Testing
Java testing framework created by Cedric Beust, still actively maintained but effectively a single-lead project
- From
- Free
- Rated
- -
The short version
- Only TestNG has a free tier, so it costs nothing to try first.
- Each has a real cost: Split split is now a module of the Harness platform and split.io redirects to harness.io, so buying it means entering a Harness commercial relationship rather than a standalone flag vendor contract.; 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: Split covers Feature flags with targeting, TestNG covers Test dependencies.
- Prices and features above were last checked on 1 September 2026.
Where they differ
Only the attributes on which Split and TestNG actually diverge.
Identical on both: user rating (Not yet rated), category (Testing).
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 Split
- Feature flags with targeting
- Metrics impact engine
- Guardrail metrics
- Statistical significance testing
- Event ingestion
- SDKs and streaming updates
- Audit and approvals
- Harness platform integration
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.
Split
- A product organisation that wants every release measured against conversion and latency by default, not only deliberate experimentsnot TestNG
- Running A/B tests with real statistical significance rather than comparing two dashboard linesnot TestNG
- Catching a regression at five per cent rollout because a guardrail metric fires before the change reaches everyonenot TestNG
- A team already committed to Harness for CI and CD that wants flags in the same platform and contractnot TestNG
TestNG
- A Java integration test suite that needs to skip dependent tests automatically when a prerequisite test failsnot Split
- A team wanting XML-based suite configuration to manage large, grouped test suites without touching code for each runnot Split
- A project needing native parallel test execution at the class or method level without adding a separate pluginnot Split
- A Selenium-based UI test suite that uses TestNG as the underlying runner for grouping and parallelisationnot Split
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Split
- Split is now a module of the Harness platform and split.io redirects to harness.io, so buying it means entering a Harness commercial relationship rather than a standalone flag vendor contract.
- Harness no longer publishes per-module prices, so an organisation that wants only feature management cannot get a list price and must negotiate a module out of a platform bundle.
- The measurement engine needs traffic volume to reach significance, so a product with modest usage gets flags with an experimentation layer it will rarely be able to conclude anything from.
- Metric attribution depends on correctly instrumented events flowing into Split, which is an integration project in its own right; without it you have paid for an experimentation platform and are using it as a flag switch.
- As part of a larger DevOps suite the roadmap now competes with CI, CD, security and cloud cost modules for attention, so feature management is no longer the company’s single focus the way it was as an independent product.
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
Split
On request- Harness FreeFree
- Harness Open Source and community support
- Intended for individuals and small teams
- Feature management capability limited at this tier
- Harness Essentials$undefined/year
- Bundled DevOps modules including CI, CD, IaC and security testing
- Standard support
- Pricing requires contacting sales
- Harness Enterprise$undefined/year
- Mix and match from 15 or more modules including Feature Management and Experimentation
- Premier support with a dedicated account manager
- Higher pipeline concurrency and organisation limits
TestNG
Free- TestNGFree
- Full functionality, no usage limits
- Community support via GitHub
- No commercial support tier exists
Which should you pick?
Choose Split if
- You need feature flags with targeting.
- You work on Web, API, iOS, Android, Java, Node.js, Python, Go, .NET.
- You also want metrics impact engine.
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.
Questions people ask
- Is Split or TestNG better?
- Neither clearly leads. Split starts at On request and TestNG at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Split or TestNG?
- TestNG has a free tier; the other does not. Paid plans start at On request for Split and Free for TestNG.
- Does Split or TestNG run on more platforms?
- Split runs on Web, API, iOS, Android, Java, Node.js, Python, Go, .NET. TestNG runs on Linux, macOS, Windows.
- Can I use TestNG for free?
- Yes. TestNG has a free tier, so you can try it without paying. Split starts at On request.
- What is Split best used for?
- Split is most often used for a product organisation that wants every release measured against conversion and latency by default, not only deliberate experiments, running a/b tests with real statistical significance rather than comparing two dashboard lines, catching a regression at five per cent rollout because a guardrail metric fires before the change reaches everyone, a team already committed to harness for ci and cd that wants flags in the same platform and contract. Of those, a product organisation that wants every release measured against conversion and latency by default, not only deliberate experiments and running a/b tests with real statistical significance rather than comparing two dashboard lines are not what TestNG is typically brought in for.
- What can Split do that TestNG cannot?
- Split covers Feature flags with targeting, Metrics impact engine, Guardrail metrics, Statistical significance testing. TestNG covers Test dependencies, XML suite configuration, Native parallel execution, Data providers.
Answered from the vendors’ own pages
Split: Is Split still called Split?
It is now sold as Harness Feature Management and Experimentation after the Harness acquisition, and split.io redirects to harness.io.
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.
Split: Can I buy just feature flags?
Not from a price list. Harness publishes bundle tiers and directs single-module buyers to sales.
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.
Split: What does it do that a plain flag service does not?
It attributes changes in your product metrics to specific flags with statistical significance testing and alerts on guardrail metrics.
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.
Split: Do we need a lot of traffic?
Yes. Statistical tests need volume to conclude, so low-traffic products get limited value from the measurement layer.
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