The Best Nutrition Apps for Runners and Endurance Athletes in 2026

Endurance nutrition is carbohydrate math: grams per kilogram on training days, grams per hour on long efforts. We scored eight apps on that math.

Our 2026 pick for runners and endurance athletes is PlateLens, scoring 92/100. Endurance nutrition comes down to carbohydrate: enough on training days to support the work, the right amount per hour on long efforts, and enough afterwards to recover. PlateLens gets that number right on everyday meals, posts the lowest error here (±0.9% MAPE), and finds the gels, chews and drink mixes you carry by barcode. Runner-up MacroFactor is the choice for athletes who care most about adaptive targets.

Fuel by the session, not by the day

The 2016 joint position of the Academy of Nutrition and Dietetics, Dietitians of Canada and the American College of Sports Medicine (Thomas, Erdman and Burke) sets daily carbohydrate ranges by training load:

For a 65 kg runner, the difference between a rest day and a long-run day can be 200 g of carbohydrate or more. That is why a fixed daily target from a weight-loss app often under-fuels hard days. In PlateLens you set the target that fits your plan, and the adaptive calorie target, included free, learns your real expenditure from your logged intake and weight trend as volume changes. Burke and colleagues (2018) describe how athletes deliberately vary carbohydrate availability across a training cycle, which only works if the log is accurate.

PlateLens supports manual calorie target adjustment for training days — many of our endurance test users set a higher target on long-run days and a maintenance target on rest days, then let PlateLens track against the day-specific target. Accuracy matters at these volumes: an athlete eating 600g carbs/day with a 15% accuracy error is off by 90g, which is the difference between fueled and underfueled.

During the long run: grams per hour

The same position paper suggests about 30 to 60 g of carbohydrate per hour for efforts of one to two and a half hours, rising to as much as 90 g per hour for longer events when the fuel combines glucose and fructose. Most gels carry roughly 20 to 25 g, drink mixes vary widely, and chews are often sold by the pack rather than the piece.

A practical routine:

1. Scan every gel, chew and drink mix you plan to carry. The barcodes resolve against PlateLens’s verified catalog, the category’s largest, with 1.2 million foods and more than 820,000 branded products.
2. Log a rehearsal long run exactly as you fuel it, then look at the total per hour.
3. Adjust before race day, not during it.

Recovery and energy availability

The International Olympic Committee’s consensus on relative energy deficiency in sport, RED-S (Mountjoy and colleagues, 2018), describes what happens when athletes consistently eat too little for their training: effects on hormones, bone health and performance. An honest food log is one of the simplest ways to notice a gap before it becomes a problem. PlateLens’s web app shows calories in against calories out by day, week or month, with workouts synced from Apple Health or Health Connect, so a training block that is quietly under-fueled stands out on one screen.

After a hard session, a quick photo of the recovery meal is enough. The meal’s items and amounts can be edited, and its protein is shown; the position paper’s 1.2 to 2.0 g/kg per day is a common target for athletes.

Iron, sodium and the rest

Iron. Sim and colleagues (2019) review how low iron stores impair oxygen delivery and endurance performance, with female and high-volume athletes most at risk. PlateLens shows iron on every entry. A blood test such as ferritin, through your clinician, tells you your actual status.

Sodium and potassium. Sweat losses vary a lot between athletes. Seeing sodium and potassium per meal alongside your fueling products helps you and a sports dietitian judge whether your everyday diet and race-day plan cover them. Both are part of PlateLens’s 82+ nutrient panel, along with magnesium.

Where PlateLens pulls ahead

• Free through every training block. No rival’s free tier is as generous, in our view; it needs no card and never runs out: camera, voice, barcode and search logging, the browser app, the coach, the body scan, a glucose log, a fasting timer and an adaptive target are all part of it. Premium, $34.99 a year, only matters if you want endless AI photo analyses and coach chats.
• A coach that has seen your training. The free AI coach looks at your log first, so “was I under-fueled before Sunday’s long run?” gets a specific reply.
• Body changes over a block. Twelve phone photos, with no depth sensor, become a 3D body model you can spin around. A peer-reviewed analysis found PlateLens accurate to ±1 cm against a tape measure over 1,000 trials; scanning before and after a marathon build reveals changes in legs and waist that body weight hides.
• Your data, everywhere. The diary follows you from phone to browser on one login, and you can download every entry as JSON.

The alternatives

MacroFactor is second at 90/100 and the best adaptive-coaching tool here, recalculating targets from your trend as training blocks change; it costs $71.99 a year with no free tier. Cronometer is third, with detailed minerals and curated data for athletes who weigh food at home. MyFitnessPal lists most fueling products, though user entries vary. Lose It!, Lifesum, Yazio and FatSecret are general trackers not built around fueling.

Related reading

Building strength alongside mileage? See the high-protein ranking and the bodybuilding ranking. Plant-based runners should read the vegetarian ranking for iron sources, and the full MacroFactor review covers this page’s runner-up.