I have a fixathon team working on an app called Sortin'.
The splash page is up at https://sortin.app - although there are a couple of minor tweaks to be made, but let me know what you think.
It's a bit of an experiment, as we're trying to use technologies we haven't looked into before. Flutter for mobile app development and Rails in API-only mode. The developers on the project are Rails developers by trade, but we don't typically use API only and none of us have ever looked into Flutter before. It's a good job education is our main goal.
The app will help you sort your recycling. So currently, we're looking into how were going to handle product recognition and then how to categories items into recyclable groups!
Product recognition sounds relatively simple when you say it, but it's turning out to be more difficult (or more expensive) than we initially anticipated. Many of the third parties we've reviewed are either expensive or have a very small product catalogue.
Once product recognition was resolved, we needed a way to categorise items. A lot of product recognition can tell you what it is, but can't tell you the information we actually need - what it's made out of. With that in mind, it's looking like we might have to get some user input to help build up our database.
We we're already thinking of working a way for the users to add and edit products into the functionality, but now it's looking like we have to slightly pivot and make it a definite factor in our app.