# Triangle3 vs WeldNote

The clearest difference is price: WeldNote at Free against Triangle3's $3.99. WeldNote also leads on iOS requirement (13.0 vs 15.0). Triangle3's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support there is nothing between them.

WeldNote is free to download; Triangle3 costs $3.99 up front. WeldNote sells 1 in-app purchase, starting at $4.99 per month. Triangle3 asks for nothing beyond the download.

## The numbers

| Metric | Triangle3 | WeldNote |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Positive reviews | 40.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 weeks | — |
| Monetization | Paid | — |
| Size | 7 MB | 35 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ryo sasaki](https://appshunter.io/developer/318552526) | [KAEDE UTSUNOMIYA](https://appshunter.io/developer/6772946771) |

## What reviewers say

### Triangle3

[App page](https://appshunter.io/ios/app/triangle3/id1643788233)

This app provides advanced calculation tools for field work, specializing in right and unequal triangles. It supports complex shapes like cones, pipes, and screw wings, with AR visualization for floor plans. It also includes standard calculator functions and memory features.

**Highlights:** Right and unequal triangle calculations, Complex shape development (cones, pipes, etc.), Augmented Reality (AR) floor plan visualization, Standard calculator functions with memory, Trigonometric and cosine theorem calculations, PCD and screw wing calculations

**Features:** Vision Pro support

**In-app purchases:** none


### WeldNote

[App page](https://appshunter.io/ios/app/weldnote/id6772946769)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Plan | $4.99 | per month |


## Frequently asked questions

### Is Triangle3 free?

Triangle3 costs $3.99, with no in-app purchases.

### Is WeldNote free?

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

### Do Triangle3 or WeldNote have ads?

WeldNote shows ads; Triangle3 does not.

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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.*