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APIs · head to head

curl vs Selenium

curl logo

curl

APIs

Command-line tool for transferring data using URLs with wide protocol support

From
Free
Rated
-
Full reviewWebsite
Selenium logo

Selenium

Testing

Browser automation framework and the W3C WebDriver standard

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: curl open-source with no vendor pricing: curl is free and open-source under GPL 3.0; no subscription or licensing costs apply; 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: curl covers HTTP/HTTPS, Selenium covers W3C WebDriver.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which curl and Selenium actually diverge.

Attributes where curl and Selenium differ
AttributecurlSelenium
Pricing modelopen-sourceOpen source, no licence fee
PlatformsLinux, MacOS, Windows, Unix, MobileLinux, macOS, Windows, Web
CategoryAPIsTesting
Founded1997Unknown

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 curl

  • HTTP/HTTPS
  • FTP
  • Multiple protocols
  • Universal compatibility
  • Scripting tools
  • Linux support
  • MacOS support
  • Windows support

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.

curl

  • API Developmentnot Selenium
  • API Gatewaynot Selenium
  • API Testingnot Selenium
  • API Documentationnot Selenium
  • Microservicesnot Selenium

Selenium

  • Cross-browser testing where Safari and legacy browsers must be coverednot curl
  • Teams whose test suites are written in Java or C# rather than JavaScriptnot curl
  • Distributing a large suite across a grid of machinesnot curl

Where each one falls short

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

curl

  • Open-source with no vendor pricing: curl is free and open-source under GPL 3.0; no subscription or licensing costs apply
  • Commercial support costs hidden: site references 'commercial support available' but pricing is not detailed or accessible from homepage
  • No SaaS model: curl is a command-line tool and library; costs are limited to optional commercial support contracts (pricing unknown)
  • Self-support burden: free software means customers rely on community forums or undisclosed commercial support pricing

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

curl

Free
  • Open SourceFree
    • Full curl functionality
    • Community support

Selenium

Free
  • SeleniumFree
    • Full functionality
    • Unlimited tests
    • Community support

Which should you pick?

Choose curl if

  • You need http/https.
  • You want to start without paying.
  • You work on Linux, MacOS, Windows, Unix, Mobile.
  • You also want ftp.
curl review

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.
Selenium review

Questions people ask

Is curl or Selenium better?
Neither clearly leads. curl 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, curl or Selenium?
curl starts at Free and Selenium at Free.
Does curl or Selenium run on more platforms?
curl runs on Linux, MacOS, Windows, Unix, Mobile. Selenium runs on Linux, macOS, Windows, Web.
Can I use curl for free?
Both have a free tier, so you can try either at no cost before committing.
What is curl best used for?
curl is most often used for api development, api gateway, api testing, api documentation. Of those, api development and api gateway are not what Selenium is typically brought in for.
What can curl do that Selenium cannot?
curl covers HTTP/HTTPS, FTP, Multiple protocols, Universal compatibility. Selenium covers W3C WebDriver, Many language bindings, Selenium Grid, Broad browser support.

Answered from the vendors’ own pages

curl: How much does curl cost?

curl is free and open-source software under the GPL 3.0 license. There is no cost to download, use, or modify the software.

Source
Selenium: Is Selenium free?

Yes, open source with no licence fee. Paid costs come from grid infrastructure or services like BrowserStack.

curl: Is commercial support available for curl?

Yes. The curl website references 'commercial support available,' but pricing and details are not disclosed on the homepage and require visiting the support page.

Source
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.

curl: Can I sponsor curl financially?

Yes. The curl website offers an option to 'Sponsor curl financially.' Visitors can donate to support curl development, but the donation link must be accessed through the site's support section.

Source
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.

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