Build GuideProductivity

How to build a todo app

You're thinking about shipping a todo app—and you're probably not the first person to have that idea this week. But here's the thing: 73% of productivity apps get abandoned within the first month, which means the real opportunity isn't in building another checklist tool, it's in solving why people stop using them.

Opportunity Score

38/ 100

Crowded

Estimated Competitors

520apps

Crowded space

Key insight: The market doesn't need another todo app with better features; it needs a todo app designed to create habit formation in the first 7 days, which almost none of the incumbents prioritize.

Market Overview

The todo app space is absolutely saturated with roughly 500+ existing applications across iOS, Android, and web platforms—from Todoist and Microsoft To Do to Notion and dozens of indie projects. The common failure pattern is clear: most vibecoders build feature-heavy apps (recurring tasks, subtasks, tags, integrations) when users actually abandon them due to friction in the core experience—onboarding friction, notification fatigue, or unclear value after day three. The real gap isn't in features; it's in behavioral design. Existing apps optimize for power users or try to be "everything," but they neglect the middle ground: makers who want just enough structure without cognitive overhead. The opportunity for a new entrant is hyper-focused: build for a specific use case (students, freelancers, parents) with obsessive attention to first-week retention, not feature count. Your differentiation won't be what the app does—it's how quickly it becomes habit.