It is combination of: - Cron-style heartbeat manager - Easy customization with markdown only - Good out-of-box memory management that just works - Good set

It is combination of: - Cron-style heartbeat manager - Easy customization with markdown only - Good out-of-box memory management that just works - Good set of tools out-of-box that just work Like Jack Dorsey said about project success, limit number of details and make those details perfect