# HydroLog vs DEPTH Training App

The clearest difference is in-app purchases: DEPTH Training App at none against HydroLog's 7. DEPTH Training App also leads on device support (4 vs 2) and iOS requirement (15.5 vs 18.6). On price, update cadence and ads there is nothing between them.

Both are free to download. HydroLog sells 7 in-app purchases, starting at $0.99 per month. DEPTH Training App asks for nothing beyond the download.

HydroLog ships an update every 8 days, DEPTH Training App fortnightly. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | HydroLog | DEPTH Training App |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 8 days** | Fortnightly |
| Size | 6 MB | 184 MB |
| Requires iOS | 18.6 | **15.5** |
| Devices | iPhone, Apple Watch | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Andre Moura](https://appshunter.io/developer/1864639204) | [Depth Training INC](https://appshunter.io/developer/1475004017) |

## What reviewers say

### HydroLog

[App page](https://appshunter.io/ios/app/hydrolog-water-tracker/id6757146528)

**Features:** Apple Watch app

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $0.99 | per month |
| HydroLog Premium 1 Month | $1.99 | per month |
| Annual | $1.99 | per month |
| Annual | $7.99 | per year |
| HydroLog Premium 1 Year | $12.99 | per year |
| Monthly | $12.99 | per month |
| Premium | $17.99 | one-time |


### DEPTH Training App

[App page](https://appshunter.io/ios/app/depth-training-app/id6759113253)

**Features:** Apple Wallet, Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is HydroLog free?

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

### Is DEPTH Training App free?

DEPTH Training App is free to download, with no in-app purchases.

### Do HydroLog or DEPTH Training App have ads?

Neither HydroLog nor DEPTH Training App shows ads.

### Which is updated more often, HydroLog or DEPTH Training App?

HydroLog ships an update every 8 days, and DEPTH Training App fortnightly. Most recently, HydroLog was updated on October 21, 2026 and DEPTH Training App on October 24, 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.*