Cambridge Brain Science Tests
From their website: “Cambridge Brain Training emphasizes measuring your cognitive performance over training your brain.
Taking a challenge will give you a snapshot of the current functioning of your brain. A lot of lifestyle factors, such as physical activity, sleep, and stress (which you can track in your journal), affect your cognitive performance. Taking the tests at Cambridge Brain Sciences allows you to view how your cognition changes along with your life. Think of it more like a Fitbit for your brain than a piece of exercise equipment.”
This one isn’t possible because there’s no API available for us to get access to test data.