Tim Holmgren

I used Grok 3 and Grok 4 throughout development to help write, review, and test code faster. They were especially useful for catching edge cases, generating test data, and refining tricky logic. Having an AI pair programmer let me move quicker and focus more on the user experience instead of getting stuck in the weeds.

I use Firebase for authentication and Firestore for real-time syncing because it lets users log in instantly and collaborate on shared checklists with live updates. It's fast, reliable, and scales effortlessly—perfect for keeping everyone in sync without extra infrastructure.

I chose RevenueCat to manage subscriptions because it handles all the backend complexity—tracking, renewals, cancellations, and user entitlements—without me building it from scratch. It gives me accurate insights and makes it easy to offer trials, upgrades, and premium features across devices.

I chose ChatGPT over other services because it’s faster, more reliable, and better at understanding natural language. It generates cleaner, more actionable checklists with fewer tweaks needed—saving me time and giving users a smoother experience.