# 24 vs Zero Cal

The clearest difference is in-app purchases: 24 at none against Zero Cal's 2. 24 also leads on iOS requirement (12.0 vs 16.4). Zero Cal's advantage is update cadence (every 5 days vs every 3 months). On price, ads and device support there is nothing between them.

Both are free to download. Zero Cal sells 2 in-app purchases, starting at $9.99 per month. 24 asks for nothing beyond the download.

24 ships an update every 3 months, Zero Cal every 5 days. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | 24 | Zero Cal |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/zero-cal-calorie-tracker/id6794630122/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 days** |
| Monetization | — | Subscription |
| Size | 30 MB | 119 MB |
| Requires iOS | **12.0** | 16.4 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Greaton OÜ](https://appshunter.io/developer/955310271) | [Oleg Filimonov](https://appshunter.io/developer/1769783383) |

## What reviewers say

### 24

[App page](https://appshunter.io/ios/app/24-7fitnessee/id1485421958)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Zero Cal

[App page](https://appshunter.io/ios/app/zero-cal-calorie-tracker/id6794630122)

Effortlessly track your daily calorie and macronutrient intake using AI-powered food logging.  Choose from voice, text, photo, barcode, or label scanning to quickly log meals and monitor your progress with visual feedback.

**Highlights:** AI-powered food logging, Log via voice, text, photo, barcode, or label, Calorie and macro estimates, Visual progress tracking, AI food context analysis, Multi-language support

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Zero Cal Monthly | $9.99 | per month |
| Zero Cal Yearly | $89.99 | per year |


## Frequently asked questions

### Is 24 free?

24 is free to download, with no in-app purchases.

### Is Zero Cal free?

Zero Cal is free to download, with in-app purchases available.

### Do 24 or Zero Cal have ads?

Neither 24 nor Zero Cal shows ads.

### Which is updated more often, 24 or Zero Cal?

24 ships an update every 3 months, and Zero Cal every 5 days. Most recently, 24 was updated on November 3, 2026 and Zero Cal on October 31, 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.*