Cognitive Testing
The efficiency of the work most people do is a combination of their ability to focus and think. Cognitive testing helps you optimize the second. Unfortunately, it can easily be the most time consuming part of a health tracking routine.
Tool Infobox 
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Scientifically Validated
quantified-mind.com/science Paper with refs including caveat that it is "not formal neuropsychological testing and is not diagnostic...consult a medical professional if you have any concerns about your mental health". Some tests have a early practice effect. Boring and even stressful. DG (talk)
N-back Common working memory task. Several implementations are available. Training may improve other WM tasks and therefore train IQ.[1]
Games
Fun.
Chess. lichess.org Most programs record moves even timestamps. Analysis programs though are based on computer analysis and will not give an analysis of human performance.
Video Games. Fighting games train and even analyze player's exact timings on button presses and reactions. Many other types are becoming E-Sports and should get or have in depth analysis of player performance.
Training
Test your cognitive abilities while training a skill.
Tying: Amphetype.
Memorize facts and lexicon with flashcards, measure long term memory: anki.
Background
Examples include how long it takes to open a smart phone or misspelling when typing emails. Take not extra time on the users part. Could not find any apps.
Puzzles Games
Similar to, and more fun then the validated test above but often useless. Would need to compare other people's scores on exact same puzzle.
Many many many available on smart phones.