Comparison

Core Performance vs Callie

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Core Performance

Features
Read full description

Guiding you through your health and fitness journey! - Book classes online in just a few clicks - Create your own exercise programmes or select from a range provided by the club - Track your progress from all your workouts - Keep track of your body measurements and progress - Take part in regular fitness challenges - Contact club staff directly - Interact and get to know your fellow members - See all the latest club news, offers and events - Refer Friends to the club online - Recipes Library - Video Workout Library APPLE HEALTH App Integration Track your progress with our HealthKit app integration to import and measure your daily steps, distance or calories burnt. Also use HealthKit to import your data from a range of different wearable devices.

About

Callie

This calorie tracker is designed for women, automatically adjusting targets and nutrition guidance based on your menstrual cycle phases. It offers smart weight trend analysis and effortless food logging to help you understand your body's fluctuations.

Highlights
  • Cycle-synced calorie and macro targets
  • Phase-specific nutrition guidance
  • Smart weight trend analysis
  • Camera-based food logging
  • Automatic menstrual phase prediction
  • Manual period tracking
Features
Read full description

The calorie tracker built for women. Cycle-sync your calories so the scale finally makes sense — with phase-aware targets, micronutrient priorities, smart trends, water tracking, and food logging in seconds. Callie is a women’s calorie tracker that automatically adjusts your daily calories and macros to your menstrual phase — so calorie counting finally works with your body instead of against it. WHY WOMEN ARE SWITCHING TO CALLIE CYCLE-SYNCED CALORIE TRACKING • Phase-adaptive daily calorie targets • Macro splits that shift across menstrual, follicular, ovulatory and luteal phases • +150 kcal lift and higher fat ratio during luteal — when cravings peak • Phase-specific nutrition guidance, including iron-rich foods during your period SMART WEIGHT TRENDS • 7-day rolling average so daily fluctuations don’t derail you • Cycle-aware context — Callie tells you when a spike is likely water retention, not a setback • Trend chart with cycle phase bands so you can see your real progress • Compare your current weight to your starting point and 7-day average at a glance EFFORTLESS FOOD LOGGING • Scan a meal with your camera • Search a clean, accurate food database • Save your favourite meals for one-tap logging • Calorie counting and macro tracking in one simple flow WATER TRACKING • Log your daily water intake • Track hydration alongside your food, calories, macros and cycle • Build a consistent hydration habit that supports your goals CYCLE TRACKING THAT ACTUALLY MAPS TO YOU • Manual period start and end logging • Automatic phase prediction across menstrual, follicular, ovulatory and luteal phases • Daily cycle insights and nutrition focus • Works with regular and irregular cycles REFER FRIENDS, GET REWARDED • Refer 3 friends to Callie and get 1 free month • Share cycle-synced calorie tracking with women who want nutrition that works with their body WHO CALLIE IS FOR • Women who want a calorie tracker that respects their hormones • Anyone tired of one-size-fits-all calorie counting apps • Women losing weight, maintaining, or just learning their body • Anyone who wants cycle-synced nutrition without overwhelm EULA - https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Terms of use - https://thecallieapp.com/terms Privacy Policy - https://thecallieapp.com/privacy

Screenshots

Core Performance4 screens
Callie4 screens

Verdict

The call

The clearest difference is in-app purchases: Core Performance at none against Callie's 8. Core Performance also leads on iOS requirement (13.0 vs 15.1). Callie's advantage is update cadence (every 10 days vs every 2 months). On price, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Callie sells 8 in-app purchases, starting at $4.99 per 7 days. Core Performance asks for nothing beyond the download.

UpkeepUpdate frequency

Core Performance ships an update every 2 months, Callie every 10 days. The most recent releases landed on October 11, 2026 and October 24, 2026 respectively.

Scorecard3 real differences · 6 level
Core Performance versus Callie: the parameters behind the verdict, then further details
ParameterCore PerformanceCallie
PriceFreeFree
Rating—4.5 (64 ratings) — better
Number of ratings—64 — better
Update frequencyEvery 2 monthsEvery 10 days — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Freemium
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS13.0 — better15.1
Further details — not scored
Size27 MB61 MB
Age rating4+17+
Developer3ONE5 MARKETING LIMITEDKian Burke

In-app purchases

None

Core Performance

No in-app purchases

8 purchases

Callie

Subscriptions8
  • Callie Pro Weekly$4.997 Days
  • Callie Pro Weekly$9.997 Days
  • Callie Pro Monthly$19.991 Month
Show 5 more
  • Callie Pro Monthly$24.991 Month
  • callie.pro.annual.downsell$69.991 Year
  • Callie Pro3 Days trial$99.991 Year
  • Callie Pro Annual7 Days trial$99.991 Year
  • Callie Pro Annual$99.991 Year

Questions

Is Core Performance free?
Core Performance is free to download, with no in-app purchases.
Is Callie free?
Callie is free to download, with in-app purchases available.
Do Core Performance or Callie have ads?
Neither Core Performance nor Callie shows ads.
Which is updated more often, Core Performance or Callie?
Core Performance ships an update every 2 months, and Callie every 10 days. Most recently, Core Performance was updated on October 11, 2026 and Callie on October 24, 2026.

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