# IS RT vs Weldwise

The clearest difference is in-app purchases: IS RT at none against Weldwise's 1. Weldwise's advantage is update cadence (every 4 weeks vs every 5 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Weldwise sells 1 one-off in-app purchase. IS RT asks for nothing beyond the download.

IS RT ships an update every 5 months, Weldwise every 4 weeks. The most recent releases landed on October 4, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | IS RT | Weldwise |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 4 weeks** |
| Size | 28 MB | 3 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Institut de Soudure](https://appshunter.io/developer/1735474226) | [ENES AYKUT AYDEMIR](https://appshunter.io/developer/6782291739) |

## What reviewers say

### IS RT

[App page](https://appshunter.io/ios/app/is-rt/id6479296879)

**Features:** macOS Compatibility

**In-app purchases:** none


### Weldwise

[App page](https://appshunter.io/ios/app/weldwise-welding-calculator/id6783706623)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weldwise Pro | $6.99 | one-time |


## Frequently asked questions

### Is IS RT free?

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

### Is Weldwise free?

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

### Do IS RT or Weldwise have ads?

Neither IS RT nor Weldwise shows ads.

### Which is updated more often, IS RT or Weldwise?

IS RT ships an update every 5 months, and Weldwise every 4 weeks. Most recently, IS RT was updated on October 4, 2026 and Weldwise on October 20, 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.*