I'm a PM who wanted to own every layer of a product, so I built ChaList alone. Most challenge apps let you tap "done." ChaList doesn't — every task needs a photo, and that photo stays locked until the other person finishes the same task. Then both unlock at once. Two modes: dare a friend one-on-one, or host a challenge your followers join. Hosts set an entry price in coins and earn a share of the pool, so opening a challenge is also a way to grow and get paid.