Testing · head to head
GrowthBook vs Selenium
GrowthBook
Testing
Open source feature flags and A/B testing that run experiment analysis inside your own data warehouse
- From
- Free
- Rated
- -
Selenium
Testing
Browser automation framework and the W3C WebDriver standard
- From
- Free
- Rated
- -
The short version
- Each has a real cost: GrowthBook warehouse-native analysis is only an advantage if you have a warehouse with clean event data in it; without one, GrowthBook has nothing to compute against and you are back to buying an event-collecting platform.; Selenium flaky tests are the standing complaint: explicit waits and synchronisation are the tester’s job, where newer tools handle it automatically
- They diverge on capability: GrowthBook covers Feature flags, Selenium covers W3C WebDriver.
- Prices and features above were last checked on 31 August 2026.
Where they differ
Only the attributes on which GrowthBook and Selenium actually diverge.
| Attribute | GrowthBook | Selenium |
|---|---|---|
| Pricing model | Per user per month | Open source, no licence fee |
| Platforms | Web, Self-hosted, Docker | Linux, macOS, Windows, Web |
Identical on both: starting price (Free), free tier (Yes), 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 GrowthBook
- Feature flags
- Warehouse-native analysis
- Reusable metric definitions
- Bayesian and frequentist engines
- CUPED variance reduction
- Visual editor
- Self-hosting
- Guardrail metrics
Only in Selenium
- W3C WebDriver
- Many language bindings
- Selenium Grid
- Broad browser support
What people use each for
The jobs each tool is most often brought in to do.
GrowthBook
- An engineering team that wants feature flags without a per-monthly-active-user bill that grows with product successnot Selenium
- A data team that needs experiment results to reconcile exactly with the metrics reported in its BI toolnot Selenium
- A company with data residency or privacy constraints that cannot send user-level event data to a third-party vendornot Selenium
- Running long-tail experiments where sequential testing and CUPED shorten the time to a decision on low-traffic surfacesnot Selenium
Selenium
- Cross-browser testing where Safari and legacy browsers must be coverednot GrowthBook
- Teams whose test suites are written in Java or C# rather than JavaScriptnot GrowthBook
- Distributing a large suite across a grid of machinesnot GrowthBook
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
GrowthBook
- Warehouse-native analysis is only an advantage if you have a warehouse with clean event data in it; without one, GrowthBook has nothing to compute against and you are back to buying an event-collecting platform.
- Metrics are SQL, so a marketing or product team without data engineering support cannot define or fix them, and a badly written metric silently produces a confident wrong answer.
- Cloud Pro bills per seat and then adds CDN request and bandwidth overages, so a high-traffic site can find the variable component exceeds the seat cost it budgeted for.
- Self-hosting means you own the Mongo database, the SDK endpoint availability and the upgrade path, and a flag service that is down is a production incident, not an analytics inconvenience.
- The statistics engine exposes real choices, Bayesian versus frequentist, sequential testing, variance reduction, and the tool will not stop a team that configures them wrongly, so it rewards statistical literacy and punishes its absence.
Selenium
- Flaky tests are the standing complaint: explicit waits and synchronisation are the tester’s job, where newer tools handle it automatically
- Setup involves drivers, versions and grid infrastructure that Playwright and Cypress bundle away
- Slower to run than tools that talk to browsers over a debugging protocol rather than WebDriver
Pricing, plan by plan
GrowthBook
Free- Open source (self-hosted)Free
- Unlimited users, feature flags and experiments
- One project
- MIT licensed, you run the infrastructure
- Starter (cloud)Free
- Up to 3 users
- 1 project
- Unlimited flags, experiments and traffic
- Pro (cloud)$40/month
- Per seat, up to 50 users
- 3 projects
- CDN overage at $10 per million requests beyond the included allowance
- Enterprise$undefined/year
- Unlimited users and projects
- SSO, audit logs and advanced permissions
- Available on cloud or self-hosted
Selenium
Free- SeleniumFree
- Full functionality
- Unlimited tests
- Community support
Which should you pick?
Choose GrowthBook if
- You need feature flags.
- You want to start without paying.
- You work on Web, Self-hosted, Docker.
- You also want warehouse-native analysis.
Choose Selenium if
- You need w3c webdriver.
- You want to start without paying.
- You work on Linux, macOS, Windows, Web.
- You also want many language bindings.
Questions people ask
- Is GrowthBook or Selenium better?
- Neither clearly leads. GrowthBook starts at Free and Selenium at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, GrowthBook or Selenium?
- GrowthBook starts at Free and Selenium at Free.
- Does GrowthBook or Selenium run on more platforms?
- GrowthBook runs on Web, Self-hosted, Docker. Selenium runs on Linux, macOS, Windows, Web.
- Can I use GrowthBook for free?
- Both have a free tier, so you can try either at no cost before committing.
- What is GrowthBook best used for?
- GrowthBook is most often used for an engineering team that wants feature flags without a per-monthly-active-user bill that grows with product success, a data team that needs experiment results to reconcile exactly with the metrics reported in its bi tool, a company with data residency or privacy constraints that cannot send user-level event data to a third-party vendor, running long-tail experiments where sequential testing and cuped shorten the time to a decision on low-traffic surfaces. Of those, an engineering team that wants feature flags without a per-monthly-active-user bill that grows with product success and a data team that needs experiment results to reconcile exactly with the metrics reported in its bi tool are not what Selenium is typically brought in for.
- What can GrowthBook do that Selenium cannot?
- GrowthBook covers Feature flags, Warehouse-native analysis, Reusable metric definitions, Bayesian and frequentist engines. Selenium covers W3C WebDriver, Many language bindings, Selenium Grid, Broad browser support.
Answered from the vendors’ own pages
GrowthBook: Is the self-hosted version actually usable, or crippled?
It is genuinely usable: unlimited users, flags and experiments on one project under an MIT licence. The paid tiers add multiple projects, SSO, audit logs and support.
Selenium: Is Selenium free?
Yes, open source with no licence fee. Paid costs come from grid infrastructure or services like BrowserStack.
GrowthBook: Do I need a data warehouse?
For experiment analysis, effectively yes. Feature flagging works without one, but the reason to choose GrowthBook over a flag-only tool is the warehouse-native statistics.
Selenium: Selenium or Playwright?
Playwright handles waiting automatically and is faster to set up, which removes most flakiness complaints. Selenium wins on language breadth, browser coverage including Safari, and existing suites you already have.
GrowthBook: How does the cost compare with LaunchDarkly or Optimizely?
GrowthBook charges per seat rather than per monthly active user or per tracked event, so cost stops scaling with traffic. At high volume that difference is large.
Selenium: Is Selenium still relevant?
Yes. Its WebDriver protocol is a W3C standard implemented by every major browser, and very large existing suites are not rewritten cheaply.
GrowthBook: Does it support mobile and server-side flags?
Yes, there are SDKs across JavaScript, React, Python, Go, Ruby, PHP, Java, Kotlin, Swift and more, covering client, server and mobile evaluation.
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