# Stealth Hydro Data vs Welding Toolbox 2

The clearest difference is price: Stealth Hydro Data at Free against Welding Toolbox 2's $7.99. Stealth Hydro Data also leads on iOS requirement (12.0 vs 16.0). On update cadence, ads, in-app purchases and device support there is nothing between them.

Stealth Hydro Data is free to download; Welding Toolbox 2 costs $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Stealth Hydro Data ships an update every 41 months, Welding Toolbox 2 every 29 months. The most recent releases landed on September 14, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Stealth Hydro Data | Welding Toolbox 2 |
| --- | --- | --- |
| Price | **Free** | $7.99 |
| Positive reviews | — | 50.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 41 months | **Every 29 months** |
| Monetization | — | Paid |
| Size | 8 MB | 29 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 9+ | 4+ |
| Developer | [JM Test Systems Inc.](https://appshunter.io/developer/1477078443) | [Parsify Technologies Antoni Kepinski](https://appshunter.io/developer/1546617908) |

## What reviewers say

### Stealth Hydro Data

[App page](https://appshunter.io/ios/app/stealth-hydro-data/id1492354898)

**Features:** macOS Compatibility

**In-app purchases:** none


### Welding Toolbox 2

[App page](https://appshunter.io/ios/app/welding-toolbox-2/id1546617906)

This app provides essential tools for welding inspection, including calculators for heat input, equivalent carbon content, critical metal parameters, and pitting resistance. It supports both metric and imperial systems and allows for data export.

**Highlights:** Heat input calculator, Equivalent carbon content calculator, Critical metal parameter calculator, Pitting resistance calculator, Metric & imperial system support, Result history and export, Open-source

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

**In-app purchases:** none


## Frequently asked questions

### Is Stealth Hydro Data free?

Stealth Hydro Data is free to download, with no in-app purchases.

### Is Welding Toolbox 2 free?

Welding Toolbox 2 costs $7.99, with no in-app purchases.

### Do Stealth Hydro Data or Welding Toolbox 2 have ads?

Neither Stealth Hydro Data nor Welding Toolbox 2 shows ads.

### Which is updated more often, Stealth Hydro Data or Welding Toolbox 2?

Stealth Hydro Data ships an update every 41 months, and Welding Toolbox 2 every 29 months. Most recently, Stealth Hydro Data was updated on September 14, 2026 and Welding Toolbox 2 on September 15, 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.*