# Gain Weight vs AI Calorie Tracker & Dietitian

The clearest difference is update cadence: Gain Weight at daily against AI Calorie Tracker & Dietitian's every 5 days. Gain Weight also leads on iOS requirement (17.0 vs 27.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Gain Weight sells 2 in-app purchases, starting at $9.99 per month and AI Calorie Tracker & Dietitian sells 4 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Gain Weight ships an update daily, AI Calorie Tracker & Dietitian every 5 days. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Gain Weight | AI Calorie Tracker & Dietitian |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ai-calorie-tracker-and-dietitian/id6770921845/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Daily** | Every 5 days |
| Monetization | Freemium | Free with in-app purchases |
| Size | 17 MB | 12 MB |
| Requires iOS | **17.0** | 27.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Moo & Company](https://appshunter.io/developer/1827801961) | [Co Trinh Hien Duy](https://appshunter.io/developer/1578475993) |

## What reviewers say

### Gain Weight

[App page](https://appshunter.io/ios/app/gain-weight-stackcal/id6762064997)

This app helps users track calorie intake specifically for gaining weight and muscle mass. It offers quick meal logging via photo recognition and provides personalized targets based on user stats and goals. Data is kept private on the device with optional iCloud sync.

**Highlights:** Bulk-first calorie targets, AI-powered photo meal logging, One-gesture logging for weight and portions, Clear home screen with daily progress, Trend-based weight tracking, Privacy-focused, no account needed

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| StackCal Pro 月額プラン | $9.99 | per month |
| StackCal Pro 年額プラン | $49.99 | per year |


### AI Calorie Tracker & Dietitian

[App page](https://appshunter.io/ios/app/ai-calorie-tracker-and-dietitian/id6770921845)

This app offers on-device AI for calorie and macro tracking, allowing you to log meals by photo, barcode, voice, or text. It provides personalized nutrition plans and insights, with all data processed locally for enhanced privacy.

**Highlights:** On-device AI food scanning, Barcode nutrition scanning, Voice and text meal logging, Private AI nutrition coach, Personalized smart goals, Apple Health synchronization, Progress charts and insights

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Voidpen Plus Weekly | $3.99 | per 7 days |
| Voidpen Plus Monthly | $11.99 | per month |
| Voidpen Plus Yearly | $31.99 | per year |
| Calorie Tracker Plus Lifetime | $99.99 | one-time |


## Frequently asked questions

### Is Gain Weight free?

Gain Weight is free to download, with in-app purchases available.

### Is AI Calorie Tracker & Dietitian free?

AI Calorie Tracker & Dietitian is free to download, with in-app purchases available.

### Do Gain Weight or AI Calorie Tracker & Dietitian have ads?

Neither Gain Weight nor AI Calorie Tracker & Dietitian shows ads.

### Which is updated more often, Gain Weight or AI Calorie Tracker & Dietitian?

Gain Weight ships an update daily, and AI Calorie Tracker & Dietitian every 5 days. Most recently, Gain Weight was updated on November 5, 2026 and AI Calorie Tracker & Dietitian 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.*