Cronometer is a food-tracking app that gives very consistent results when different people log the same meals — especially for endurance athletes in Canada — so researchers and doctors can trust it for accurate diet tracking.

Cronometer does a pretty good job tracking calories and key nutrients like carbs, fat, and protein for Canadian endurance athletes — its numbers are very close to the official nutrient database.

The Cronometer app tends to show higher amounts of fibre and vitamins A and D in the diets of Canadian endurance athletes than what's actually in the official Canadian food database — probably because it counts fibre differently and includes fortified foods from other countries.

MyFitnessPal isn’t very reliable when it comes to tracking sodium and sugar — different people log the same foods differently, especially men, so it might not be good for studies or health advice.