# ThunDroid AI vs HydroFoo

The clearest difference is update cadence: ThunDroid AI at every 2 weeks against HydroFoo's every 2 months. HydroFoo's advantage is device support (3 vs 1). On price, ads, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. ThunDroid AI sells 1 in-app purchase, starting at $12.99 per month and HydroFoo sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

ThunDroid AI ships an update every 2 weeks, HydroFoo every 2 months. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | ThunDroid AI | HydroFoo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/thundroid-ai/id6746182736/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 2 months |
| Monetization | Freemium | — |
| Size | 32 MB | 20 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | iPhone | **iPhone, iPad, Apple Watch** |
| Age rating | 17+ | 4+ |
| Developer | [Aetherrax Technologies](https://appshunter.io/developer/1811867367) | [GARRETT MICHAEL WOODSIDE](https://appshunter.io/developer/1853175827) |

## What reviewers say

### ThunDroid AI

[App page](https://appshunter.io/ios/app/thundroid-ai/id6746182736)

This app offers AI-powered mental wellness support, integrating CBT, DBT, and ACT therapy frameworks. It features guided breathing exercises, an intelligent journal, and a live voice mode for real-time interaction, all designed to help manage stress and emotions.

**Highlights:** AI-powered CBT, DBT, ACT therapy frameworks, Stanford-validated cyclic sighing stress reset, 13 guided breathing techniques, Live voice mode for AI interaction, Intelligent journal with 15 templates, On-device AES-256 encryption for privacy

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ThunDroid Membership | $12.99 | per month |


### HydroFoo

[App page](https://appshunter.io/ios/app/hydrofoo-water-tracker/id6760419525)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HydroFoo Pro Monthly | $1.99 | per month |
| HydroFoo Pro Lifetime | $12.99 | one-time |


## Frequently asked questions

### Is ThunDroid AI free?

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

### Is HydroFoo free?

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

### Do ThunDroid AI or HydroFoo have ads?

Neither ThunDroid AI nor HydroFoo shows ads.

### Which is updated more often, ThunDroid AI or HydroFoo?

ThunDroid AI ships an update every 2 weeks, and HydroFoo every 2 months. Most recently, ThunDroid AI was updated on October 24, 2026 and HydroFoo 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.*