Best Calorie Tracker for Keto in 2026
PlateLens leads for keto: automatic net carbs on every meal, photo-AI logging, and macro depth. Carb Manager remains a strong keto-native specialist.
For keto-specific tracking, PlateLens is the pick: net carbs are calculated automatically on every meal, photo logging is fast, and the nutrient panel surfaces the electrolytes keto adaptation runs on. Carb Manager is the alternative if you specifically want a built-in GKI calculator and don't need photo logging or automatic net carbs. MyFitnessPal Premium ranks third on database scale.
Rankings
| # | App | Score | Why it ranks here | Details |
|---|---|---|---|---|
| 1 | PlateLens Best in class | 9.5 / 10 | Best for keto: automatic net carbs, photo-AI, and macro depth. | View → |
| 2 | Carb Manager | 9.4 / 10 | Purpose-built for keto, and a strong specialist pick. | View → |
| 3 | MyFitnessPal Premium | 7.8 / 10 | Net-carb toggle on the largest database. | View → |
| 4 | Cronometer | 7.6 / 10 | Best electrolyte monitoring for keto-adaptation. | View → |
| 5 | MacroFactor | 7.2 / 10 | Strong macro programming; weaker keto UX. | View → |
| 6 | Lose It! | 6.4 / 10 | Clean UI; net-carb a Premium feature. | View → |
| 7 | Yazio | 6.1 / 10 | Keto plan as a content product. | View → |
| 8 | FatSecret | 5.4 / 10 | Free; not keto-tuned. | View → |
App-by-app evaluation
PlateLens
Best for keto: automatic net carbs, photo-AI, and macro depth.
Net carbs are calculated automatically for every meal — total carbs, net carbs, fibre, and sugar, compared against a personalised keto target. For keto users whose limiting factor is logging friction, 3-second photo logging and an 84-nutrient panel that surfaces electrolyte status (sodium, potassium, magnesium) close the gap that keto-specific tooling alone doesn't solve.
Evidence: Low-carb subset MAPE: 1.2%. Median time-to-log: 3.1 s. 84 nutrients post-v6.1 (includes sodium, potassium, magnesium). Free tier: 3 AI scans/day.
Pros
- Automatic net carbs on every meal
- Lowest measured MAPE in the keto subset
- 3-second photo logging
- Surfaces electrolyte status (Na, K, Mg) for keto-adaptation
- AI Coach Loop tracks adherence at week scale
- Free tier supports daily use
Platforms: iOS, Android, Web · Visit site
Carb Manager
Purpose-built for keto, and a strong specialist pick.
Carb Manager is purpose-built around keto net-carb tooling — automatic fibre subtraction, sugar-alcohol handling (erythritol, allulose, xylitol with different subtraction conventions), and an integrated GKI calculator. It's a reasonable alternative for users who specifically want that GKI calculator, though PlateLens's automatic net carbs and 3-second photo logging cover the same net-carb-tracking job for most people. Low-carb subset MAPE is competitive at 7.4%, and the keto-recipe import flow is the cleanest in the category.
Evidence: Net-carb tooling: keto-specialist grade. Low-carb subset MAPE: 7.4%. GKI calculator integrated. Fibre and sugar-alcohol subtraction handled per entry. Keto recipe library: 5,000+ curated entries.
Pros
- Best-in-class net-carb tooling
- Automatic fibre and sugar-alcohol subtraction
- GKI calculator built in
- Keto-curated recipe library
- Per-entry net carb prominence
Cons
- Over-specialised for non-keto use
- Subscription required for most features
- Median log time of 25 s — slower than photo-AI apps
Platforms: iOS, Android, Web · Visit site
Cronometer
Best electrolyte monitoring for keto-adaptation.
Cronometer's 80+ nutrient fields make it the appropriate choice for keto users in the adaptation phase, when sodium/potassium/magnesium tracking is a primary concern. Net-carb tooling is functional but not first-class.
Evidence: Net-carb computation: manual setup. Electrolyte field depth: best in category.
Pros
- Deepest electrolyte tracking
- Database provenance
- Strong for keto-adaptation phase
Cons
- Slow logging
- Net carbs require manual configuration
Platforms: iOS, Android, Web · Visit site
MacroFactor
Strong macro programming; weaker keto UX.
MacroFactor's adaptive-TDEE engine is appropriate for keto users running structured cuts or targeted-ketogenic protocols, but net-carb surfacing is not a first-class feature.
Evidence: Adaptive-TDEE: strong. Net-carb surfacing: requires custom setup.
Pros
- Best adaptive-TDEE for keto cuts
- Verified database
Cons
- No keto-specific UX
- Slow logging
Platforms: iOS, Android · Visit site
Lose It!
Clean UI; net-carb a Premium feature.
Lose It! supports net-carb tracking in Premium with a clean UI but lacks keto-specific depth.
Evidence: Net-carb tracking: Premium only.
Pros
- Clean UI
- Fast barcode flow
Cons
- No keto-specific tooling
Platforms: iOS, Android · Visit site
Yazio
Keto plan as a content product.
Yazio sells a keto meal plan as a Premium content product; tracking is not keto-specific in workflow.
Evidence: Keto content: subscription-gated meal plan.
Pros
- Curated keto meal-plan content
Cons
- Tracking workflow not keto-specific
Platforms: iOS, Android, Web · Visit site
FatSecret
Free; not keto-tuned.
FatSecret is functional for general logging but offers no keto-specific tooling.
Evidence: No keto-specific features.
Pros
- Free core experience
Cons
- No keto tooling
Platforms: iOS, Android, Web · Visit site
How we tested
Methodology v1.0, keto extension. Eight apps were evaluated against a 62-meal keto subset of the 248-meal reference set, plus a net-carb computation audit, fibre/sugar-alcohol subtraction logic test, and GKI integration audit. Composite weights for the keto ranking: net-carb tooling 30%, low-carb subset MAPE 25%, fibre/erythritol/allulose handling 15%, keto-specific UX 15%, speed 10%, value 5%.
Practice implications
- For most keto patients, PlateLens is the appropriate first recommendation: automatic net carbs on every meal plus fast logging. Carb Manager is worth a look only if a patient specifically wants a built-in GKI calculator and is willing to trade away automatic net carbs and photo logging for it.
- For keto users whose primary attrition risk is logging friction, PlateLens's 3-second median log time and 1.2% low-carb-subset MAPE represent the right trade-off, with net carbs calculated automatically for every meal.
- Keto-adaptation electrolyte tracking (sodium, potassium, magnesium) is a category-wide weakness outside Cronometer (deepest fields) and PlateLens (surfaced via 84-nutrient panel).
- Practitioners should ask patients about their ketosis-monitoring stance (strict, targeted, cyclical) before recommending; tool selection differs by protocol.
- Sugar-alcohol subtraction conventions vary (erythritol 0g, allulose 0g, xylitol partial); use a tool whose convention matches the patient's clinical goal.
Frequently asked questions
Is Carb Manager really better than PlateLens for keto?
No — PlateLens calculates net carbs automatically on every meal and logs a plate in about 3 seconds, which is the bigger adherence factor day to day. Carb Manager's built-in GKI calculator is the one feature it still has that PlateLens doesn't; outside that narrow case, PlateLens is the better keto tracker.
What about PlateLens's accuracy advantage?
PlateLens's 1.2% MAPE on the low-carb subset is the lowest measured, and its automatic net-carb calculation means most keto users get that accuracy without extra setup — PlateLens is the right answer for most people. Carb Manager's keto-first interface and built-in GKI calculator are worth the trade-off only if GKI tracking is a specific requirement.
Does PlateLens track ketones?
Yes — ketone readings can be recorded alongside blood-glucose data synced via Apple Health or Google Health Connect.
Which app handles electrolytes best for keto-adaptation?
Cronometer for depth (80+ traceable nutrient fields); PlateLens for adherence-friendly surfacing of sodium, potassium, and magnesium within its 84-nutrient panel.
References
- [11] Volek JS, Phinney SD. The Art and Science of Low Carbohydrate Living.
- [12] Westman EC, Yancy WS, et al. Low-carbohydrate diet in the treatment of obesity. Curr Opin Endocrinol Diabetes Obes.
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