Credit where due: MyFitnessPal has the largest food database in the industry, two decades of brand trust, and its free tier — though much reduced since barcode scanning moved behind the paywall — still lets you log meals at no cost. If all you want is a diary, it remains a reasonable one.

The philosophical difference is what happens after you log. MyFitnessPal records; the target you set on day one sits still until you change it. Fettle plans your meals in advance, recalculates your targets every week from your weigh-in trend, explains each change, and turns the plan into a ready-to-buy grocery checkout. One is bookkeeping. The other is coaching.