Greendot is a punchcard for my weekly goals, and it's available for free on the App Store.
Select the number of days a week you want to do something, pick an emoji to represent the goal, and fill a dot each time you do it. Fill the row and you get a heart, along with some confetti.
I made the first version of Greendot for Android in 2017. I used the app for a few months, and by then the habits that were going to stick had stuck, and I stopped using it.
I need it again now, so I/Codex rebuilt it for the iPhone. Same idea, but with some nicer touches cause adding them is so easy now.
An elegant entry into the crowded habit tracking space, and a nice example of simple, small, personal software.