Cronometer vs Deficit: Comparison

The 60-second decision

If most of these are true about you, use Cronometer:

• You want to track vitamins and minerals (iron, vitamin D, omega-3s, B-complex, etc.) at the same level as macros
• You're managing a medical condition with dietary implications (anemia, deficiency, recovery, eating disorder support)
• You want a long-term general nutrition tracker rather than a cutting tool specifically
• You're not specifically training for body composition change
• You want a free tier (Cronometer has one; Deficit doesn't)
• You're on Android, or want desktop/web access

If most of these are true about you, use Deficit:

• You're cutting body fat over a defined 4 to 12 week window
• You're a gym-goer with 1+ years of training experience
• You want your protein and calorie targets anchored on lean body mass rather than total weight
• You want the app to recommend a deficit based on your sex and body fat, and adjust it weekly
• You're on iOS

If you're somewhere in the middle, using both apps for different jobs is fine. Cronometer for daily micronutrient awareness, Deficit for an active cutting cycle. They don't conflict.

At a glance

Cronometer pricing varies by region and plan tier; see their site for current numbers. Deficit's $49.99/yr is the highlighted plan, and all Deficit plans include a 7-day free trial.

Where Cronometer is the better choice

Cronometer has been doing this since 2011 and has 10M+ users. They're built for jobs Deficit isn't trying to do.

If you need micronutrient depth

Cronometer's defining feature is the 84-nutrient breakdown across vitamins, minerals, amino acids, and fatty acids, sourced primarily from the USDA database with their own lab-analyzed additions. Deficit tracks calories and protein with high precision but treats fat, carbs, and micros as secondary. If you need to verify you're hitting iron, vitamin D, B12, magnesium, or omega-3s, or you're tracking for a medical reason, Cronometer is the right tool. Deficit isn't.

If you're managing a clinical or medical situation

Eating disorder recovery, anemia, kidney disease, athlete recovery from injury: anywhere a registered dietitian or doctor is involved, Cronometer is the more appropriate tool. It has the accuracy and the breadth. Deficit is built around an opinionated cutting framework that isn't appropriate (and could be harmful) in clinical contexts.

If you want the most accurate food database

Cronometer's "verified" foods (their lab-analyzed entries marked with a check icon) are some of the most accurate macro/micro data available in any consumer app. For everyday tracking, the database difference between Deficit and Cronometer is marginal. For serious nutrition science work, Cronometer's depth wins.

If you want a free tier

Cronometer's free tier covers most basic tracking. Cronometer Gold unlocks custom recipes, biometric tracking, and other power features. Deficit is paid-only with a 7-day free trial. If recurring subscription is a dealbreaker, Cronometer is the only one of the two with a fully-free path.

If you're on Android or use a desktop

Cronometer ships native iOS, Android, and a polished web app. Deficit is iOS-only at launch. Same platform constraint as the MacroFactor comparison: if you need cross-device, Deficit is out.

Where Deficit is the better choice

If you're cutting body fat, not "tracking nutrition"

The biggest framing difference. Cronometer is a tracker. It shows you what you ate and how it compared to fixed targets, then leaves the strategy to you. Deficit is a coaching tool. It picks your calorie deficit based on body fat category, recommends 8-week cycles by default, anchors protein on lean mass, and adjusts your targets weekly based on what your body does.

For a focused cut, "the app picks the strategy and adapts it" is a different product than "the app shows you the data." Deficit is the first, Cronometer is the second.

If body composition matters more to you than weight

Cronometer treats body fat % as one optional metric among many ("biometric tracking" on Gold). Deficit treats it as the primary input. Body fat sets your body fat category, which sets your recommended deficit, which sets your protein and calorie targets. Every number on the screen flows from body composition.

If "the scale isn't moving but I look leaner" is the experience you've been frustrated by, that's recomposition. It's legible in body fat trend, not in scale weight. Deficit makes that the first chart.

If you want Cunningham over Mifflin-St Jeor

Cronometer uses Mifflin-St Jeor for BMR, the standard equation using total weight, height, age, and sex. Deficit uses Cunningham, which takes lean body mass directly. For trained populations, Cunningham predicts resting metabolic rate within ±10% of measured values; Mifflin-St Jeor consistently underestimates trained subjects by 5 to 15%.

The lean body mass calculator shows the math worked end-to-end with examples.

If you want a finite cycle, not indefinite tracking

Cronometer is built for "track every day, forever, in case the data is useful later." Deficit is built for "run an 8-week cut, finish it, take a break, run another." The day's calorie deficit can be identical, but the shape over a year is different.

More on this in the cycles philosophy article.

The four real differences (in detail)

What they prioritize

Cronometer prioritizes data depth: the most accurate record of what you ate, broken down across 84 nutrients. Deficit prioritizes strategy: picking the right calorie deficit, the right protein target, the right cycle length, and adjusting them as your body responds.

Both apps log food. Cronometer's job after logging is "show you the data so you can interpret it." Deficit's job after logging is "tell you what to do tomorrow based on what happened today."

How they calculate calories: Mifflin vs Cunningham

Cronometer: Mifflin-St Jeor (men)
RMR = 10×weight(kg) + 6.25×height(cm) − 5×age + 5
TDEE = RMR × activityMultiplier (~1.2 to 1.9)

Deficit: Cunningham
BMR = 500 + 22 × LBM(kg)
TDEE = BMR × PAL × TEF
  where PAL = 1.10 to 1.40 (calibrated)
  and   TEF = 1.08 to 1.15

Cunningham doesn't need height or age. It uses lean mass directly, which is the physiological signal those proxies estimate. For trained populations, this matters: two people with the same height, age, and sex can have substantially different metabolic rates if their body composition differs. Mifflin can't see that. Cunningham does.

Cronometer also includes the Thermic Effect of Food via per-food data, but the baseline TDEE estimate ignores it. Deficit folds TEF into the calorie target as a multiplier (1.08 to 1.15) calibrated for high-protein eating.

How they handle protein

Cronometer lets you set a protein goal as a fixed number, a percentage of calories, or a g/kg of body weight ratio. Deficit fixes the protein anchor at 2.2 g per kg of lean body mass. Non-negotiable, supported by the 2018 ISSN position stand and Helms 2014.

For an average-composition lifter the two land at similar numbers. They diverge at body composition extremes (very lean or very high-BF lifters), where the LBM-anchored target is more biologically appropriate.

How they structure dieting

Cronometer doesn't structure dieting. You set goals; the app shows you whether you hit them. Phase changes, cycle length, "what happens after the cut": all of that lives in your head, not the app. That's appropriate for Cronometer's broad audience, since most users aren't running a cut.

Deficit structures dieting explicitly. Pick a cycle (4 to 12 weeks, default 8). The app builds the plan, runs the weekly check-in, adjusts targets, prompts you to stop on the planned end date, and proposes a maintenance phase before the next cycle. The structure is the point.

Things that overlap

• Food logging fundamentals. Search, barcode scanning, recents, favorites. Both apps are fast at typical day-to-day logging.
• Apple Health integration. Both pull steps, workouts, and weight from HealthKit on iOS.
• Macro tracking. Both track protein, carbs, and fat. Both let you set targets and see daily totals.
• Weight tracking. Both log weight and show trends. Cronometer's Gold tier extends this to additional biometrics; Deficit's body fat tracking is more central.

If your decision comes down to "which one logs my breakfast faster," they're functionally tied. The decision is upstream: what job are you asking the app to do?

Frequently Asked Questions

Other Deficit comparisons

Weighing a few options? See how Deficit compares to MacroFactor, MyFitnessPal, and Carbon Diet Coach, or read how Deficit works under the hood.