In the last few months I have been building an AI assistant that is quite possibly saving my life.
It's an iOS app that uses LLMs to estimate and track nutrients and calories in all the food I eat. It is plugged in to Apple Health so it sees all my activity, sleep, body metrics, etc. I have set some general health goals in the app and it uses this to rate (poor, neutral, good) and advise me on the food I log. A calendar view shows how each day has gone in a traffic light coloring system. I can also log contextual notes to help it make sense of my day, and it has a memory system so each session has continuity.
The assistant can save extracted or inferred nutritional data in a library, like when I give it photos of nutritional labels for foods I eat frequently or I log the same thing repeatedly, for easy reuse later. Also useful for home made meals and recipes.
I've connected it to my workout tracker app Hevy so it can keep tabs on my exercise and also adjust my programs based on me chatting with it in the app about how a workout went. This is really useful for swapping out exercises I struggle with, for example, or to keep a well-balanced program over time.
Recently I added an Apple Watch companion app with a watch face complication so I can keep an easy eye on things like up-to-date calorie deficit.
All built in Swift with Opus on the $20 plan. I realize I can probably use existing AI nutrition tracking apps, and probably also connect Claude to Apple Health, but the joy of building and getting this to be completely tailored to me has been so fun and extremely useful. I've shared it with a few friends, but since I am paying for all the API tokens currently I have not yet tried to get more users onboarded.