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ECG for Apple Watch - ECG app and irregular heart rhythm notification
LogicLike - Improve logical thinking through engaging brain games
AliveCor Mobile ECG - A freakin' heart monitor for your smartphone
Dualnback.works - Dual N-back is a specific brain training exercise, that's been shown by research - it might improve fluid intelligence.
Thriva - Smart finger-prick blood tests you take at home
JobFlare - Brain games for job seekers