2025-08-21 00:00:00 The One Percent app helps you create your own 90-day challenge – a practical tool that helps you build healthy habits that support your goals, step by step, every day. It is built on the proven principles and experience of Vašek Tomance, the founder of one of the largest self-development communities in the Czech Republic and Slovakia. Every big change starts with small, everyday steps. Start your change now.