# Relentless vs HydroScan

The clearest difference is in-app purchases: Relentless at none against HydroScan's 2. Relentless also leads on update cadence (every 2 weeks vs every 4 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. HydroScan sells 2 in-app purchases, starting at $5.99 per 7 days. Relentless asks for nothing beyond the download.

Relentless ships an update every 2 weeks, HydroScan every 4 months. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Relentless | HydroScan |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.5 (4 ratings)](https://appshunter.io/ios/app/hydroscan-water-scanner/id6754213192/reviews)** |
| Number of ratings | — | **4** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 4 months |
| Monetization | — | Free with in-app purchases |
| Size | 56 MB | 43 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Itensity Management Software (PTY) Ltd](https://appshunter.io/developer/914495980) | [ENGIN KUTUK](https://appshunter.io/developer/1823697018) |

## What reviewers say

### Relentless

[App page](https://appshunter.io/ios/app/relentless/id6742490410)

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

**In-app purchases:** none


### HydroScan

[App page](https://appshunter.io/ios/app/hydroscan-water-scanner/id6754213192)

This app uses AI to analyze bottled water by scanning labels. It provides instant insights into pH levels, minerals, purity, and source information, helping you understand your water's composition. It's designed for those seeking cleaner, healthier, and more transparent water choices.

**Highlights:** AI-powered water analysis, Scan labels for insights, Analyze pH, minerals, purity, Understand water source, Compare water brands

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Plan | $5.99 | per 7 days |
| Yearly Plan | $29.99 | per year |


## Frequently asked questions

### Is Relentless free?

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

### Is HydroScan free?

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

### Do Relentless or HydroScan have ads?

Neither Relentless nor HydroScan shows ads.

### Which is updated more often, Relentless or HydroScan?

Relentless ships an update every 2 weeks, and HydroScan every 4 months. Most recently, Relentless was updated on November 4, 2026 and HydroScan on October 30, 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.*