TestNG vs Storybook
Feature checklists rarely decide anything. What decides it is the pricing metric, who has to write the tests, and which limitation you can live with.
Entry price
Free and open source
Open sourceFree and open source
Open sourceWhat drives the bill
The metric that actually scales your invoice.
Free and open source. You pay in engineering time and CI minutes.
Storybook itself is free. Chromatic, the hosted visual-review service from the same team, is a separate paid product.
Free tier
Everything, self-hosted
Everything, self-hosted
Open source
Apache-2.0
MIT
Self-hostable
No-code authoring
Languages
Platforms
Fits teams
Adoption
Widely used
TestNG Team · since 2004
Category standard
Chromatic / OSS community · since 2016
Strengths
- Mature parallel-execution and grouping model, ideal for large Selenium suites.
- Data providers make data-driven testing straightforward.
- Test dependencies and ordering, which JUnit deliberately avoids.
- One artefact serves as documentation, visual baseline and interaction test.
- Design-system teams get a shared reference that designers can actually open.
- Rich addon ecosystem for accessibility, viewport and state manipulation.
Limitations
- XML suite configuration is dated and error-prone.
- Test dependencies encourage ordering coupling that makes suites fragile.
- Community momentum favours JUnit 5 for new projects.
- Meaningful configuration and maintenance overhead; a neglected Storybook rots fast.
- Build times on large component libraries get long.
- Stories drift from production usage unless discipline is enforced.
Best for
Java Selenium automation frameworks and large integration suites.
Teams maintaining a design system or a large shared component library.
Pricing last reviewed August 2026 and is indicative only — confirm on each vendor’s own page.