Low-Carb Tracking Apps Compared: The Subtraction, the Extras and the Subscription

A general calorie counter and a low-carb tracker look almost identical on the surface. Both take a food, both give you macros back. The difference is one subtraction, performed dozens of times a week, and whether the app does it or you do.

That subtraction is also the reason low-carb comparisons go wrong. People compare feature lists when the thing that actually determines their daily experience is a counting convention buried three screens down.

Disclosure: this article is published by Reign Creative LLC. We make one of the four apps discussed below — Keto Diet Tracker: Low Carb — so we have a direct commercial interest in you installing it. The comparison is written to remain useful if you choose one of the others, and we have set out below the cases where one of the others is the better fit.

Everything stated here about another company's product was read on that company's own website on 3 September 2026 and is limited to what those pages said. This category changes its packaging frequently; confirm current details with the vendor before deciding.

The subtraction is the product

Net carbs is not a regulated measurement. A US Nutrition Facts panel declares Total Carbohydrate with Dietary Fiber, Total Sugars and Added Sugars beneath it — the net figure is arithmetic performed afterwards, by you or by software, according to a convention someone chose. We take that apart properly in net carbs, explained.

The practical consequence for choosing an app is this: when a tracker shows you a net carb number, it is showing you the output of its own rule. The rule usually starts from total carbohydrate and removes dietary fiber, and most low-carb conventions also remove sugar alcohols and some newer sweeteners. Which sweeteners, and whether all fibers are treated the same, is where apps diverge.

So the first question is not "does this app do net carbs" — nearly all of them do — but "does it do them the way I intend to count, and does it do them without me thinking about it."

Keto Diet Tracker: Low Carb subtracts fiber along with erythritol, allulose and monk fruit from total carbohydrate each time you log a food, and it can alert you when a day passes a limit you set yourself. That is a stated convention rather than a hidden one, which is the property that matters: a number you can reproduce beats a number that is theoretically purer.

What each app is built around

Carb Manager

Carb Manager's own site describes tracking net carbs, macros and micros, and going well beyond food: it names tracking for ketones, blood glucose and insulin, and for glycemic load and GKI, plus intermittent fasting. Its named sections include a Macros Tracker, Food Tracker, Meal Planner, Recipe Database, Keto Academy, Community, Exercise Portal, Advanced Insights and Health Integrations, with Fitbit and Garmin named among device syncs.

Two things stand out from that list as genuine differentiators. The Recipe Database and Meal Planner are positioned as a large part of the product rather than an accessory, and there is a Community and a Keto Academy — social and educational components that no purely mechanical logger has. If you want the app to also be where you get recipes and where you talk to other people doing the same thing, that is a real reason to pick it, and it is a reason we cannot match.

Cronometer

Cronometer is not a keto app, and it is worth including precisely because of that. Its features page lists "Track Any Diet," describing customisation for keto among others, and its strength is the nutrient panel rather than the carb rule.

On its pricing page the free Basic tier includes custom macro and micronutrient targets, a barcode scanner, custom foods, meals and recipes, and device syncing, with reports and charts over a seven-day window. Gold adds photo and voice logging, a Recipe Importer, a Fasting Timer, a Macro Scheduler, custom charts, coaching and unlimited historical data.

If your interest in low-carb is partly a worry about what a restricted diet does to your micronutrient intake — a reasonable worry, given that MedlinePlus notes low-carb diets can limit daily fiber — a nutrient-depth tracker answers a question a carb-focused one does not.

MyFitnessPal

MyFitnessPal is the general tracker most people already have. It logs macros and micronutrients and has the broadest set of entry routes, and it can be used for low-carb eating by treating carbohydrate as the number you watch.

The relevant detail for a low-carb reader is where its line falls. MyFitnessPal's own Premium page lists "Custom macros and goals" and an "Intermittent fasting tracker" among Premium features. Setting a specific carbohydrate target is the entire point of low-carb tracking, so which side of the paywall that sits on is not a minor packaging question. Read their current Premium page before assuming either way.

Keto Diet Tracker: Low Carb

Ours is built narrowly around the low-carb day. The net carb subtraction runs automatically on every entry, with an optional alert when a day passes the limit you chose. There is a low-carb food database and a barcode scanner for packaged items, custom foods and recipes for anything you cook, and a meal planner covering breakfast, lunch, dinner and desserts. A built-in macro calculator turns details you enter — age, height, weight, activity level — into starting fat, protein and net carb figures you are free to change.

Around the food sit the other logs: ketone readings you took yourself with blood, urine strips or a breath meter including GKI, an intermittent fasting timer, water, and sodium, potassium and magnesium. Body measurements, photo logs, charts and weekly and monthly summaries hold the history.

It is free to download on Google Play, supported by ads, and it has no in-app purchases — everything listed above is in that free download. No account is required, and logs are stored locally on your device rather than on our servers.

What it does not have: no wearable or device integrations, no community, no recipe marketplace or course content, and no full micronutrient panel beyond the electrolytes named above. Those are the trades we made to keep it a single-purpose log.

The half of low-carb tracking that is not food

This is where these apps separate more than they do on food logging, and it is under-discussed.

Ketone readings. Blood meters, urine strips and breath meters each produce a number, and people who use them want that number next to the day it belongs to. Carb Manager names ketone, blood glucose, insulin and GKI tracking; ours records blood, urine strip and breath readings including GKI. Neither app measures anything — a phone cannot. It stores what you type in, and a reading is a data point you collected, not a medical result.

Fasting windows. Fasting timers appear across the category but not always in the free tier: Cronometer's pricing page lists its Fasting Timer under Gold, MyFitnessPal's Premium page lists an intermittent fasting tracker under Premium, Carb Manager names intermittent fasting on its site, and ours includes a fasting timer in the free app. If you fast, check this specifically.

Water and electrolytes. Sodium, potassium and magnesium get attention in low-carb circles that they do not get in general nutrition apps. Ours logs all three alongside water. We are not going to tell you what to do with those numbers — that is a conversation for a healthcare professional — but if you are tracking them, having them in the same record as the food is the difference between a habit and three apps.