Micro-expressions are involuntary, fleeting facial expressions (lasting 1/25th to 1/15th of a second) that reveal genuine emotions a person tries to hide. Training tools aim to improve an individual’s ability to spot these expressions. Most are derived from the work of Dr. Paul Ekman , who created the Facial Action Coding System (FACS).
Buy METT only if you have a specific, high-stakes need (e.g., counter-terrorism, jury consulting) and plan to practice monthly. For casual interest, save your money. No tool will turn you into the fictional Lie to Me protagonist – the science is not there yet for real-world accuracy above chance for most people.
is excellent for research and free, but not consumer-ready. Free tools are fine for initial awareness but won’t make you reliably skilled.