Free Diet App for Keto 2026: Track Net Carbs, Macros, and Electrolytes

Keto is one of the most data-dependent diets you can follow. Staying in ketosis requires keeping net carbs under 20-50 grams per day, maintaining specific fat-to-protein ratios, and monitoring electrolytes to avoid the fatigue and headaches of "keto flu." A generic diet app that tracks total calories is not enough. You need net carb calculations, detailed fat breakdowns, and ideally sodium, potassium, and magnesium tracking — and most free apps lock those features behind a paywall.

This guide covers what keto dieters specifically need from a diet app, ranks the best free options available in 2026, explains which keto-critical features are free versus premium, and shows how Nutrola's free trial delivers the full keto tracking experience without restrictions.

What Does a Keto Dieter Need from a Diet App?

Keto is not a calorie-first diet. The macro ratios and specific nutrient tracking requirements are fundamentally different from standard weight loss tracking.

Net carb calculation, not just total carbs

The ketogenic diet works by restricting net carbohydrates — total carbs minus fiber and certain sugar alcohols. A food with 15 grams of total carbs but 10 grams of fiber has only 5 grams of net carbs. Apps that only show total carbs make keto tracking nearly impossible because high-fiber foods appear to blow your carb budget when they actually fit perfectly.

Fat breakdown by type

Not all fat is equal on keto. Saturated fat, monounsaturated fat, and polyunsaturated fat all play different roles. Many keto dieters specifically aim for high monounsaturated fat (avocado, olive oil) and adequate omega-3 intake. An app that only shows "total fat" leaves you guessing.

Electrolyte tracking: sodium, potassium, magnesium

Keto flu — the fatigue, headaches, muscle cramps, and brain fog that hit in the first 1-2 weeks — is primarily caused by electrolyte depletion. When you cut carbs, your body excretes more sodium, which in turn depletes potassium and magnesium. Tracking these three minerals is essential for a smooth keto transition, yet most free diet apps do not track any of them.

Custom macro ratios

The standard keto macro split is roughly 70-75% fat, 20-25% protein, and 5-10% carbs. Some keto variations — targeted keto for athletes, high-protein keto for muscle retention — use different ratios. Your app needs to let you set custom macro targets, not just generic calorie goals.

Best Free Diet Apps for Keto in 2026

1. FatSecret Free — Shows Macros Without a Paywall

FatSecret is the most practical free option for keto because it shows full macro breakdowns — including fat, protein, and carbs — without requiring a premium subscription. The food diary clearly displays daily macro totals, and the barcode scanner works on the free tier.

Keto strengths: Free macro visibility, barcode scanner, recipe calculator that shows macro breakdowns, meal planning with macro totals.

Keto limitations: No net carb calculation — you see total carbs only and must subtract fiber manually. No fat type breakdown. No electrolyte tracking (sodium, potassium, magnesium are not displayed). The food database is crowdsourced, so carb counts on individual entries can be unreliable. Ads interrupt the logging flow.

2. Cronometer Free — Best Micronutrient Detail but Severely Limited

Cronometer is the gold standard for nutrient detail. The free version shows net carbs (it automatically subtracts fiber), fat type breakdowns, and electrolyte levels. For raw data quality, nothing free comes close.

Keto strengths: Automatic net carb calculation, detailed fat breakdown (saturated, mono, poly, omega-3, omega-6), electrolyte tracking, high-quality curated database.

Keto limitations: The free tier is restricted to a limited number of daily food logs. Custom macro targets require the paid Gold subscription. The food database, while accurate, is smaller than competitors — meaning many packaged foods and restaurant meals are missing. The interface is functional but not visually engaging.

3. Carb Manager Free — Built for Keto but Basic on Free

Carb Manager is designed specifically for low-carb and keto dieters. The free version includes net carb tracking and a keto-focused food database. It understands the language of keto — you see net carbs prominently, not hidden in a sub-menu.

Keto strengths: Net carb display by default, keto food database, keto-specific community and recipes.

Keto limitations: The free tier is heavily restricted. Custom macro targets, detailed nutrient tracking, meal planning, and many recipes require premium. Ads are frequent on the free tier. The food database for non-US foods is limited. Electrolyte tracking is a premium feature.

Why Most Free Apps Lock Keto Features Behind Premium

There is a pattern in the diet app market: the features that keto dieters need most — net carbs, custom macros, electrolyte tracking, fat type breakdowns — are exactly the features that get paywalled. This is not coincidental.

Keto users are high-value subscribers

Diet app companies know that keto dieters are more committed and more willing to pay than casual trackers. They are following a specific protocol, they have done research, and they need precision. This makes keto features the most effective premium upsell in the diet app industry.

Net carb calculation requires better data

Calculating net carbs accurately requires fiber data for every food entry. Many crowdsourced database entries are missing fiber information, which means the app either shows inaccurate net carbs or avoids showing them at all. Building a database with complete fiber data for every entry costs money, and that cost gets passed to users through premium gates.

Electrolyte data is sparse in most databases

Sodium, potassium, and magnesium values are frequently missing from food database entries — especially user-submitted ones. Displaying electrolyte tracking as a feature requires a database where these values are actually present, which again points to verified, curated data that costs more to maintain.

How Nutrola's Free Trial Delivers Complete Keto Tracking

Nutrola's free trial unlocks every feature the app offers, making it the most complete keto tracking experience you can access without paying upfront.

Full macro customization from day one

Set your exact keto macro ratios — whether that is standard 75/20/5, high-protein keto, or a custom split your nutritionist recommended. Nutrola calculates your gram targets for fat, protein, and net carbs based on your calorie goal and macro percentages. No premium upgrade required during the trial.

Automatic net carb tracking

Nutrola calculates and displays net carbs automatically using its verified database. Every food entry includes complete fiber data, so the net carb calculation is accurate — not an estimate based on incomplete nutritional information.

Over 100 nutrients including all key electrolytes

Sodium, potassium, and magnesium are tracked alongside 100+ other nutrients. You can see your daily electrolyte intake on the main dashboard, set targets for each, and identify when you are running low before keto flu symptoms hit.

AI logging that understands keto meals

When you photograph a keto meal — a plate of salmon with avocado and a side of sauteed spinach in butter — Nutrola's AI recognizes the components and logs them with accurate fat breakdowns. Voice logging works the same way: "I had a bulletproof coffee with two tablespoons of MCT oil and one tablespoon of grass-fed butter" gets logged accurately.

1.8 million verified entries with complete nutrient profiles

Every food in Nutrola's database includes full macronutrient data (including fiber for net carb calculation), fat type breakdowns, and electrolyte values. The database is nutritionist-verified, not crowdsourced — which matters enormously for keto because a 5-gram error in carb count can knock you out of ketosis.

Keto Diet App Comparison Table 2026

Feature	FatSecret Free	Cronometer Free	Carb Manager Free	Nutrola Free Trial
Net carb tracking	No (manual math)	Yes	Yes	Yes
Custom macro ratios	Basic	Premium only	Premium only	Yes
Fat type breakdown	No	Yes	Premium only	Yes
Sodium tracking	No	Yes (limited logs)	Premium only	Yes
Potassium tracking	No	Yes (limited logs)	Premium only	Yes
Magnesium tracking	No	Yes (limited logs)	Premium only	Yes
Barcode scanner	Yes	Limited	Yes	Yes
AI photo logging	No	No	No	Yes
Voice logging	No	No	No	Yes
Database quality	Crowdsourced	Curated (small)	Mixed	1.8M+ verified
Keto recipes	Community	No	Premium only	Recipe import
Ads	Yes	Minimal	Heavy	None
Cost after free	Free (limited)	Free (very limited)	Free (basic)	2.50 euro/month

How to Set Up Keto Tracking in Nutrola

Getting your keto tracking configured in Nutrola takes about 90 seconds.

1. Download Nutrola and create your account
2. Select your goal (fat loss, maintenance, or body recomposition)
3. Go to macro settings and set your keto ratio — 75% fat, 20% protein, 5% carbs is the standard starting point
4. Nutrola calculates your daily targets in grams: for example, on a 2,000-calorie keto diet, that is approximately 167 g fat, 100 g protein, and 25 g net carbs
5. Enable electrolyte tracking on your dashboard to monitor sodium, potassium, and magnesium
6. Start logging with AI photo, voice, barcode, or manual search

During the free trial, every one of these features works without limitation.

Frequently Asked Questions

What is the best free app for tracking net carbs on keto?

Cronometer free calculates net carbs automatically with the highest data accuracy, but limits daily food logs on the free tier. Carb Manager free also shows net carbs but restricts many other keto features to premium. Nutrola's free trial provides automatic net carb tracking with no daily log limits and a verified database of over 1.8 million foods.

Can I track electrolytes on a free diet app?

Cronometer free is the only permanently free option that shows sodium, potassium, and magnesium — but with limited daily logs. FatSecret and Carb Manager free do not track electrolytes. Nutrola's free trial tracks all three electrolytes plus over 100 other nutrients with no restrictions.

How many net carbs should I eat on keto?

Most ketogenic diet protocols recommend 20-50 grams of net carbs per day. The exact number depends on your individual metabolism, activity level, and goals. Starting at 20 grams and adjusting upward based on results is the most common approach. A diet app with net carb tracking makes it much easier to hit this target consistently.

Why do some diet apps show different carb counts for the same food?

Crowdsourced databases allow users to submit nutrition data, which often results in multiple entries for the same food with conflicting values. One user might log "avocado" with 2 grams of net carbs while another entry shows 4 grams. Verified databases like Nutrola's eliminate this inconsistency by using nutritionist-reviewed entries only.

Is Nutrola good for keto?

Yes. Nutrola supports custom keto macro ratios, automatic net carb calculation, fat type breakdowns, and electrolyte tracking — all features that many competitors restrict to premium tiers. The free trial includes everything, and the paid plan is 2.50 euro per month with zero ads.

Do I need a premium diet app for keto, or will a free one work?

You can do basic keto tracking on FatSecret free by manually subtracting fiber from total carbs. However, net carb automation, electrolyte tracking, custom macro targets, and accurate food data — the features that make keto tracking sustainable — are premium features on most apps. Nutrola's free trial gives you access to all of these, and the post-trial cost of 2.50 euro per month is lower than any keto-specific app's premium tier.