Guides
Everything here is written the same way the app is built: the numbers come from peer-reviewed studies or from published product listings, each one linked at the foot of the page, and where the evidence is unflattering to us we say so. If you spot something wrong, write to contact@calso.app and we will correct it.
How accurate are photo calorie counters?
Across 52 studies, average calorie error from a food photo runs from 0.1% to 38.3%, and a person scores no better. What the research measured, and which decisions the numbers survive. 12 September 2026.
Counting calories without a food scale
Finger-width portions put 80% of foods within 25% of true weight, against 29% for cups and spoons. Which foods to weigh, which to eyeball, and the arithmetic that decides. 12 September 2026.
Cal AI alternatives: an honest comparison
Cal AI has belonged to MyFitnessPal since March 2026, which changes the question. The listings compared side by side, including where our own app falls short. 12 September 2026.
Who writes these
Calso is published by YATECH, a sole proprietorship registered in Quebec, Canada. We build one thing: an iOS app that estimates the calories and macros in a meal from a photograph, free and without a subscription. That is also our bias, and it is why every comparison here carries a disclosure and a source list. See what the app does, or the Terms and Privacy Policy for the small print.