The modern alternative to Assertible for developers
Why Checkly and not Assertible?
Checkly is built for developers and engineering teams eager to monitor their cloud native applications.
Combined E2E & API checks
Assertible is great when you want to know if your APIs are up. But it doesn’t show you the full picture - whether your UI flows and endpoints are working correctly.
Powerful Synthetics
Monitor your websites with a real Chrome browser. With Checkly you can use JavaScript to code your checks, instead of using a restrictive scripting editor.
Developer-first platform
Use our delightful UI or simply code. Checkly provides powerful API, SDK, and a Terraform provider to enable you to configure your checks via code.
What makes Checkly unique
API monitoring for developers
Checkly enables you to create flexible HTTP Checks tailored to your needs.
- Monitor your API for performance & correctness
- Run custom JavaScript before and after your check with setup & teardown scripts
- Easily create your checks with our API, our Terraform provider and our Swagger importer
E2E checks with real browsers
Code your checks and control exactly how they interact with a real browser.
- Use real and worldwide distributed browsers to validate what you need using Puppeteer or Playwright
- Run your tests constantly or via our CI/CD integrations
Trusted by engineering teams at
Global coverage
Get a clear picture of how your services perform for all your users around the world. Run your checks from any of our twenty
data center locations spread over the Americas, EMEA, Asia Pacific, and Africa.
Our datacenter locations