Hourlines

Inspiration

I live in Berlin but my family is in Seoul, Korea and my work is based in London. Juggling different timezones is never easy and it gets more annoying when you have to do the math in your head to figure out if you can call someone after work 3 hours later. This creates a customizable widget on your home screen to give you a quick overview of the different timezones and color filtered areas.

What it does

Shows timezones at a glance

How we built it

Expo + Expo Widgets + Claude

Challenges we ran into

Expo widgets doesnt allow timeline date changes at .atEnd. It uses the previous timeline entries which are all in the past. I had to do a custom expo plugin to override the way the timelines were setup to allow for per hour accuracy. I haven't found a way to make this more generalizable to make an upstream PR.

Accomplishments that we're proud of

Updating the swift code for expo widgets to do what we want to do without dropping down to swift ui. (Which was also tried). Quick turnaround from idea to app. Fast upgrades.

What we learned

Claude is very helpful for writing languages that you dont know the syntax of but know how it should be structured. RevenueCat was dead simple for setting up IAP.

What's next for Hourlines

More personalization, start marketing with ASO.

Built With

• claude
• expo.io
• iap
• swift
• typescript
• widget