Boethius (https://www.boethi.us/) is an app I made for my 7yo son to supplement his homeschooling curriculum. It involves completed "daily workouts" of exercises drawn from the seven classical liberal arts (grammar, arithmetic, astronomy, etc...).

The "Try Random Exercise" button lets you see immediately what it's like to use, but signing up is required to get most of the benefits, such as:

* A logical ordering of exercises (learn how to recognize nouns before learning about pronouns, learn what an argument is before learning the difference between validity and soundness, etc...),

* Spaced repetition (you review those you are struggling with most, but those you ace are brought up less frequently over time)

* Configuring your experience (select the number of exercises you need to complete each day for your "daily workout", whether to play audio by default or not, etc..)

* Creating any number of child accounts so you can keep tabs on your kids' progress over time

AMA