What SaaS products does your startup use that you couldn't live without?

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.