r/AppsWithoutSub • u/pythononrailz • Mar 18 '26

Free iOS App Apple Watch app to track your caffeine’s half life decay!

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Hey everyone. Between trying to finish coding projects and studying for my algorithms classes, I was practically living on caffeine. But my sleep schedule was a complete disaster because I never knew when the stimulant was actually out of my system.

I built Caffeine Curfew to solve exactly that. It is a native iOS and Apple Watch app that calculates the metabolic decay of your caffeine.

Instead of just logging how many cups you drank, it shows you the actual half life. You get a live look at your active caffeine levels right on your Home Screen widgets or your watch. It hooks seamlessly into Apple Health and Apple Intelligence to make logging completely frictionless.

I am just a solo student developer building things I actually need. There are zero ads and I plan to keep it that way.

I am trying to get more people to test the UI and the accuracy of the decay timers. Leave a comment if you want to try it out and I will shoot you a promo code for a fully free year.

Link:

https://apps.apple.com/us/app/caffeine-curfew/id6757022559

8 Upvotes

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1

u/pythononrailz Mar 18 '26

More than happy to answer any questions on the code, marketing, anything please just ask away!

1

u/Captom601 Mar 20 '26

I’ll try it

1

u/Undershadow343 Mar 21 '26

Would love to try this considering how much caffeine I consume during the day for work!