Christian O'Brien
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The Spring app icon Spring

A privacy-first daily habit tracker for iPhone. Build habits, break bad ones and watch your streaks grow.

  • Product Strategy
  • Product Management
  • iOS App
  • Built with AI

Spring

The goal

Spring is a daily habit tracker for iPhone. Build good habits, break bad ones and watch your streaks grow. The whole point is to stay consistent without the complexity most habit apps pile on.

The challenge

Most habit apps drown you in features until tracking a habit feels like another chore. Spring had to do the opposite: strip it down to what keeps people going, see your progress, stay accountable, celebrate the wins. It also had to earn trust on privacy. Habit data stays on the device, with no third-party tracking and no ads.

My role

I owned the product side end to end: product vision, per-feature requirements, design collaboration on the prototypes and clear build specs for the iOS engineers. I also did the prompt engineering to get the app built and App Store ready, and supported the Apple review process through to approval.

How I approached it

Decide what earns its place. The core stays simple: create a habit, check it off with a tap, organize by time of day. Then a few things that change behavior: abstinence counters for what you are quitting, streaks and badges so follow-through feels good, and insights that show when you are most consistent, because most habits fail for timing, not effort.

Building it was an exercise in prompt engineering. We went from requirements to a working iOS build fast, then tightened it through Apple's review until it was ready to ship.

Most habits fail for timing, not effort.

The result

Spring is live on the App Store. The free tier covers up to five habits and two counters, and Spring+ unlocks unlimited habits and counters. A habit tracker that stays out of your way and keeps you consistent.

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Spring habits screen with the day's habits, time goals and check-offs, headed Progress starts with understanding
Habit detail for Practice Guitar showing consistency, completion and momentum scores with a calendar
Insights screen showing the best day, strongest time windows and top habits
Counters screen tracking abstinence streaks like No Alcohol and Quit Nicotine in days, hours, minutes and seconds
Streaks screen with a seven-day badge reading You're on fire

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