Cypress

CyberChef chains together 300+ data transformation operations in a drag-and-drop browser UI: encoding, decoding, encryption, compression, parsing, formatting. No Selenium, no driver headaches. You write JavaScript, it clicks things, you watch it happen live. MIT licensed. The open source version gives you a full test runner, time-travel debugging (step backward through your test), automatic waiting, and screenshot/video capture on failure. That's enough for most solo devs and small teams.

Cypress Cloud is where the money comes from. $67/mo for up to 500 test results, scaling to $250/mo and beyond. Cloud gives you parallelization across machines, flake detection, test analytics, and a dashboard to track trends. The parallelization alone can cut a 60-minute suite to 10 minutes.

Solo or small team: free tier handles it. Once your test suite grows past 500 runs per month or you need CI parallelization, you're paying. At $67/mo for a small team, that's reasonable. A flaky test suite wastes more engineering hours than that.

The catch: Cypress only tests what runs in a browser. No native mobile, no multi-tab testing. And the free tier's 500 test results per month disappears fast with any real CI pipeline.