When comparing TestingBot vs Zaptest, the Slant community recommends Zaptest for most people. In the question“What are the best automation testing tools for a medium team (5-10 testers)?” Zaptest is ranked 5th while TestingBot is ranked 9th. The most important reason people chose Zaptest is:
Also supports API testing, recording, can be run in parallel and offers integration with MicroFocus ALM, Rally or Jira.
Specs
Ranked in these QuestionsQuestion Ranking
Pros

Pro Runs Selenium tests

Pro Appium support

Pro Secure tunnel for testing code locally

Pro Run tests in parallel

Pro Allows testing both manually and automatically in several browsers and platforms
You can test your website both manually and automatically with TestingBot in different browsers and platforms.
Pro Pristine VM for each test
TestingBot guarantees a fresh, untouched virtual machine for every test, unlike with browserstack
Pro Free for 100 minutes
Free accounts receive 100 minutes free manual testing, paid accounts have unlimited manual testing minutes.
Pro Latest browsers (beta/dev)
You can run tests on the beta/dev builds of browsers, to make sure everything works on upcoming browser version releases.

Pro Real mobile devices
TestingBot now offers Real Mobile Devices in its datacenter, capable of running both automated and manual tests.

Pro Manual testing
Pro Full blown
Also supports API testing, recording, can be run in parallel and offers integration with MicroFocus ALM, Rally or Jira.
Pro Free
Free version available.
Pro Integrations
Integrations with popular tools like: JIRA, HP ALM, VSTS, TFS, and CA Rally.
Cons

Con Uses mobile emulators instead of real devices
Unlike CrossBrowserTesting, TestingBot uses mobile emulators.
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