any.do
the door is switching cost: tasks with due dates and reminders are a CSV export away, and 40M users haven't built any workflow lock-in that a fresh Postgres schema can't replicate in a weekend.
where the walls are.
their capital wall is paper-thin — runs on commodity cloud + free tiers.
the technical wall is real — research-grade engineering, not a weekend.
the blunt take.
“Forty million users on a to-do list is a distribution story, not a moat story. The core product — tasks, reminders, shared lists — is commodity CRUD with a polished skin.”
The "team" tier is where they're trying to grow, but they're competing directly with Todoist, TickTick, and Notion there. The family/personal segment is wide open for a niche contender who doesn't need to be everything to everyone — just better at one thing (grocery lists, family coordination, daily planning) for a specific slice.