# Input Hydration vs AI Calorie Tracker

The clearest difference is in-app purchases: Input Hydration at none against AI Calorie Tracker's 3. Input Hydration also leads on update cadence (daily vs every 10 days). AI Calorie Tracker's advantage is iOS requirement (13.0 vs 17.4). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. AI Calorie Tracker sells 3 in-app purchases, starting at $4.99 per 7 days. Input Hydration asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Input Hydration against 5.0 for AI Calorie Tracker. Both are backed by a comparable volume of ratings — 3 and 2 respectively.

Input Hydration ships an update daily, AI Calorie Tracker every 10 days. The most recent releases landed on September 12, 2026 and September 7, 2026 respectively.

## The numbers

| Metric | Input Hydration | AI Calorie Tracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (3 ratings)](https://appshunter.io/ios/app/input-hydration/id6670407777/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/ai-calorie-tracker-calorai/id6748743385/reviews) |
| Number of ratings | **3** | 2 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Daily** | Every 10 days |
| Monetization | **Free** | Freemium |
| Size | 1 MB | 39 MB |
| Requires iOS | 17.4 | **13.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Shafqat Rahman](https://appshunter.io/developer/1743700538) | [Manuel Worlitzer](https://appshunter.io/developer/1785527240) |

## What reviewers say

### Input Hydration

[App page](https://appshunter.io/ios/app/input-hydration/id6670407777)

Easily monitor your daily water intake with customizable goals and real-time progress tracking. View your consumption in ounces, liters, and gallons, with options for light and dark modes. Undo mistakes or reset entries effortlessly.

**Highlights:** Track daily water intake, Set personalized hydration goals, View progress in ounces, liters, gallons, Light and dark mode options, Undo and reset intake entries, Real-time visual progress tracker

**Features:** macOS Compatibility

**In-app purchases:** none


### AI Calorie Tracker

[App page](https://appshunter.io/ios/app/ai-calorie-tracker-calorai/id6748743385)

Effortlessly track your daily food intake and health goals with an AI-powered scanner. Simply photograph your meals for instant identification and nutritional calculation, including calories and macronutrients. Achieve a healthier lifestyle with smart suggestions and comprehensive insights into your eating habits.

**Highlights:** AI food scanner for instant recognition, Automatic calorie and macronutrient calculation, Smart suggestions for daily intake, Comprehensive food logging, Personalized health insights, Supports various diets and health plans

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CalorAI Premium | $4.99 | per 7 days |
| CalorAI Premium | $23.99 | per year |
| CalorAI Premium | $119.99 | per year |


## Frequently asked questions

### Is Input Hydration free?

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

### Is AI Calorie Tracker free?

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

### Which has better reviews, Input Hydration or AI Calorie Tracker?

Input Hydration and AI Calorie Tracker are both rated 5.0 out of 5 on the App Store, from 3 and 2 ratings respectively.

### Do Input Hydration or AI Calorie Tracker have ads?

Neither Input Hydration nor AI Calorie Tracker shows ads.

### Which is updated more often, Input Hydration or AI Calorie Tracker?

Input Hydration ships an update daily, and AI Calorie Tracker every 10 days. Most recently, Input Hydration was updated on September 12, 2026 and AI Calorie Tracker on September 7, 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.*