DeMind

DeMind Inc. is the company behind Lifestack, a health-driven AI calendar application that helps users schedule their day based on energy levels, using biometric data from wearables and smartphones such as Apple Watch and other health sensors. The app integrates with users' health data — including stress levels, HRV, and activity rhythms — to propose productive schedules and optimize time management. Lifestack features an AI chat assistant, smart task scheduling, two-way Apple Reminders sync, multi-day planning, and a memory system that learns user preferences. Named the #1 Health & Fitness Product of the Month on Product Hunt, Lifestack is built for productivity-conscious individuals and those with ADHD. Founded in 2022 by Nao Yukawa in San Francisco, DeMind Inc. also operates Mindland, a related wellness product.