Selenium WebDriver vs Katalon Studio

Free and open source

From $84 per seat/month (Professional, billed annually; $184 month-to-month)

Free and open source. The real cost is grid infrastructure or a device-cloud subscription.

The seat price is only part of it: CI execution needs add-ons priced separately — Runtime Engine at $145/licence/month and cross-browser or mobile device sessions at $158/session/month — so a parallel CI setup costs several times the headline seat figure.

Everything, self-hosted

Free plan covers local authoring and execution for web, mobile and API.

Category standard

Software Freedom Conservancy · since 2004

Widely used

Katalon, Inc. · since 2016

• The widest language and browser support of anything in the category, including legacy browser versions.
• A W3C standard, so it will outlive any single vendor. Skills transfer between employers.
• Every device cloud speaks Selenium, which keeps you portable between vendors.

• One tool spanning web, API, mobile and desktop, which avoids stitching four frameworks together.
• Manual testers become productive in days rather than months.
• Built-in reporting and test management reduce the number of separate purchases.

• No built-in waiting strategy, reporting, parallelism or assertions — expect to assemble and maintain a framework around it.
• Explicit waits are your problem, and getting them wrong is the number one source of flake in real Selenium suites.
• Out-of-process communication makes it slower than Playwright or Cypress.

• Record-and-playback suites become brittle at scale unless someone refactors them into keywords and objects.
• Proprietary project format makes migrating away expensive — real lock-in.
• Heavy desktop IDE; version control and code review are awkward compared to plain-text tests.

Enterprises with polyglot teams, legacy browser requirements, or an existing grid investment.

QA teams without dedicated automation engineers that need coverage across several platforms.