# SLCalculation vs Triangle3

The clearest difference is price: SLCalculation at Free against Triangle3's $3.99. On update cadence, ads, in-app purchases and device support there is nothing between them.

SLCalculation is free to download; Triangle3 costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

SLCalculation ships an update monthly, Triangle3 every 5 weeks. The most recent releases landed on October 7, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | SLCalculation | Triangle3 |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Positive reviews | — | 40.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 5 weeks |
| Monetization | — | Paid |
| Size | 19 MB | 7 MB |
| Requires iOS | **14.2** | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [tsuyoshi saito](https://appshunter.io/developer/1530882113) | [ryo sasaki](https://appshunter.io/developer/318552526) |

## What reviewers say

### SLCalculation

[App page](https://appshunter.io/ios/app/slcalculation/id1541116749)

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is SLCalculation free?

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

### Is Triangle3 free?

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

### Do SLCalculation or Triangle3 have ads?

Neither SLCalculation nor Triangle3 shows ads.

### Which is updated more often, SLCalculation or Triangle3?

SLCalculation ships an update monthly, and Triangle3 every 5 weeks. Most recently, SLCalculation was updated on October 7, 2026 and Triangle3 on October 12, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*