A free hypothesis validation platform powered by AI. Structure your team's hypotheses on a Lean Canvas-inspired framework, get AI reviews for completeness and improvement suggestions, and track the Build-Measure-Learn cycle in real time. Features include persona design, interview recording, PMF scoring dashboard, and team collaboration with comments and mentions. No credit card required.

A free iOS sound mixer that combines white, brown, and pink noise with nature sounds like rain, streams, campfire, and waves. Save custom presets, use the built-in Pomodoro timer, and enjoy natural 1/f fluctuation — all fully offline. One tap to enter your ideal focus state.

A free BJJ encyclopedia and learning app featuring 175+ techniques organized by position, 9 structured learning paths (6-12 weeks each), and a visual technique tree that maps out your options from every position. Track your progress, search in real time, and train offline — all in English, Japanese, and Portuguese.