From the perspective of QA, mabl and LaunchDarkly have both been absolute powerhouses of SaaS tools. Mabl is so effortlessly simple to use that a 5th grader could create an entire end-to-end test suite in about an hour. LaunchDarkly is similarly a major boon to developer productivity because it supercharges CI/CD in the sense that anything being shipped to production is low-risk as long as it's behind a flag. Granular user targeting lets us test features in production behind flags, unblocking developers by side-stepping the need for extensive manual testing pre-production.