# Core Performance vs Callie

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.

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.

Core Performance ships an update every 2 months, Callie every 10 days. The most recent releases landed on October 11, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Core Performance | Callie |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.5 (65 ratings)](https://appshunter.io/ios/app/callie-womens-calorie-tracker/id6768885019/reviews)** |
| Number of ratings | — | **65** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 10 days** |
| Monetization | — | Freemium |
| Size | 27 MB | 61 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [3ONE5 MARKETING LIMITED](https://appshunter.io/developer/1131538176) | [Kian Burke](https://appshunter.io/developer/1773906543) |

## What reviewers say

### Core Performance

[App page](https://appshunter.io/ios/app/core-performance/id1622843853)

**Features:** macOS Compatibility

**In-app purchases:** none


### Callie

[App page](https://appshunter.io/ios/app/callie-womens-calorie-tracker/id6768885019)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Callie Pro Weekly | $4.99 | per 7 days |
| Callie Pro Weekly | $9.99 | per 7 days |
| Callie Pro Monthly | $19.99 | per month |
| Callie Pro Monthly | $24.99 | per month |
| callie.pro.annual.downsell | $69.99 | per year |
| Callie Pro | $99.99 | per year |
| Callie Pro Annual | $99.99 | per year |
| Callie Pro Annual | $99.99 | per year |


## Frequently asked 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 25, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*