PureStretch is a free stretching and mobility app for Apple devices, published by Purestrength Limited — the same studio behind FormCheck AI and Larry AI. It puts an AI instructor at the centre of the experience: rather than serving a fixed video playlist, the app adapts routines to your current flexibility level and shifts the difficulty as you progress. The aim is a coach-like guide for people who want to improve mobility but do not want to pay for a class subscription.
The standout feature is the 3D mesh visual. Instead of a filmed demonstrator, the app renders a mesh model that shows the target shape of each stretch, which makes it easier to understand where you should feel the tension and how deep to go. Around that core sits a full session experience: curated background music and serene nature scenes for atmosphere, flexible programs that let you choose short daily micro-stretches or longer weekly routines, and analytics that track session length, flexibility improvement and milestones.
PureStretch requires iOS 15 or later and also runs on iPad, Apple-silicon Macs and Apple Vision. It is positioned as completely free, with no subscription and no in-app purchases listed, and the developer states that no data is collected from the app. It suits beginners who want gentle, guided mobility work as well as athletes using it as a recovery and warm-up companion.
