# onTrack vs Hydra

The clearest difference is iOS requirement: Hydra at 15.1 against onTrack's 17.0. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. onTrack sells 1 one-off in-app purchase and Hydra sells 2 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | onTrack | Hydra |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/ontrack-calorie-tracker/id6745999713/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | — |
| Monetization | Free with in-app purchases | — |
| Size | 3 MB | 41 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 12+ |
| Developer | [Anuj Shelat](https://appshunter.io/developer/1814751529) | [Ryan Creary](https://appshunter.io/developer/1819349085) |

## What reviewers say

### onTrack

[App page](https://appshunter.io/ios/app/ontrack-calorie-tracker/id6745999713)

Effortlessly monitor your daily active and resting calorie burn, and track your food intake against personalized targets. Stay motivated with customizable home screen widgets that display your progress at a glance.

**Highlights:** Automatic activity and calorie syncing, Monitor burned calories with progress bars, Track consumed calories and meal targets, Home screen widgets for instant data view, Customizable graph and widget colors

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Customization Feature | $6.99 | one-time |


### Hydra

[App page](https://appshunter.io/ios/app/hydra-water-tracker/id6764020000)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Hydra Pro Monthly | $6.99 | per month |
| Hydra Pro Annual | $39.99 | per year |


## Frequently asked questions

### Is onTrack free?

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

### Is Hydra free?

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

### Do onTrack or Hydra have ads?

Neither onTrack nor Hydra shows ads.

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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.*