Couple of things
I started doing the standard "finger tapping test" from the "skipping breakfast" series of tests. On my side, the test results right after the finger tapping results, dont match the test results on the final screen (100 points discrepancy). secondly on days when my finger taps increased from ~70 average to 85 average, i saw a decrease in the score (higher finger taps should correspond to higher scores). Thirdly, for 3 consecutive days my finger tapping test has remained exactly the same to the 3rd decimal place at 361.865 (I dont know how many finger taps I had, it was pretty high. But this is virtually impossible).
I dont see any validation of these tests. Just because somebody made these tests and works at Google doesnt mean that these tests are accurate.
There is no documentation of what algorithm is being used in these cases.
Yoni mentioned that theres nobody to develop the website further and its complicated to change it.
I realized later on based on the above, that I had jumped the gun and had just assumed the website was going to give correct measurements because its name started with "quantified" and kindof seemed legit.
Do you know whether any of theses tests in the websites you mentioned are validated (actually corresponds to academic research)?
If not, is it any better than any of the 100s of flash game? Just because it has a "brain" or "cognition" in its website name doesnt mean its actually measuring attention span or memory correctly. Like most of these websites seem very sketchy, I can make a flash website and throw out random numbers, and use a name like "quantified mind" or "brain games" and it will seem very legit, as long as it looks good.
If I have to make significant decision regarding any habits I want to follow, I have to make sure that the tests are actually measuring the correct thing based on my hypothesis.