StemNotes pulls your planned workouts from TrainingPeaks or intervals.icu and builds a fuel plan for each one: how many grams of carbohydrate per hour, when to eat and which of your own gels, chews, bars and drinks to use. The hard blocks get more carbs than the easy ones.

The app has three tabs:

• Calendar shows your week in the Fuel Calendar. Tap a session to open its plan.

• + adds a workout you describe in words.

• Profile shows your carb balance: what you ate against what your rides needed.

Settings sits behind the gear icon, top right of Profile.

On the bike, the plan runs on a Hammerhead Karoo, a Garmin Edge, a Garmin watch or an Apple Watch. After the ride, StemNotes works out what you should have eaten for how you actually rode.

Fuelling recommendations are guidance, not medical or nutritional advice.