SingleArm helps people learn from real-world health experiences by tracking change over time — responsibly and transparently -- either by yourself, or with a cohort. It is an AI-powered, structured self-experimentation platform that helps you measure how lifestyle changes affect you—not population averages, while embracing contextual density of confounders that would otherwise derail a traditional clinical trial. And it comes with a built-in digital cloning tool, so you can A/B test yourself.