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Dev.to
7/7/2026
133 People Started My App's Onboarding. One Finished. Here's Everything I Learned Building Toffee.

133 People Started My App's Onboarding. One Finished. Here's Everything I Learned Building Toffee.

Short summary

An engineer built Toffee, a debt payoff app (React Native/Expo), shipping v1–v4 in nightly one-hour sprints. PostHog revealed 133→1 onboarding completion—a UX problem, not pricing. Cutting onboarding to minimum and using Claude Haiku for AI coaching fixed the funnel and all downstream metrics.

  • •One-hour nightly constraint forced small, shippable units with no half-finished migrations
  • •PostHog funnel analysis found 133→1 completion rate, exposing UX catastrophe not pricing problem
  • •Boring tech stack (React Native, Claude Haiku) plus obsessive onboarding optimization won

Generated with AI, which can make mistakes.

#product-launch#ai-tools#ai-agents
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