# Trigonometry Calculator. vs IBUS Iso Manager

The clearest difference is in-app purchases: IBUS Iso Manager at none against Trigonometry Calculator.'s 2. IBUS Iso Manager also leads on ads (none vs shown). Trigonometry Calculator.'s advantage is iOS requirement (15.0 vs 17.0). On price, update cadence and device support there is nothing between them.

Both are free to download. Trigonometry Calculator. sells 2 in-app purchases, starting at $2.99 per month. IBUS Iso Manager asks for nothing beyond the download.

Trigonometry Calculator. ships an update every 2 weeks, IBUS Iso Manager every 11 days. The most recent releases landed on September 9, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Trigonometry Calculator. | IBUS Iso Manager |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/trigonometry-calculator/id6741517618/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 weeks | **Every 11 days** |
| Monetization | Free with in-app purchases | — |
| Size | 64 MB | 2 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Horitech](https://appshunter.io/developer/1794537335) | [IBUS GmbH](https://appshunter.io/developer/6784258883) |

## What reviewers say

### Trigonometry Calculator.

[App page](https://appshunter.io/ios/app/trigonometry-calculator/id6741517618)

This app calculates key values for right-angled and scalene triangles with high precision. It offers a user-friendly interface, flexible angle units, and includes a reference guide to trigonometric formulas. A subscription unlocks calculation steps and removes ads.

**Highlights:** Right-angled & scalene triangle support, Formula reference guide, Accurate side, angle, and area calculations, High precision to 14 decimal places, Flexible angle units (degrees/radians), User-friendly interface

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $2.99 | per month |
| Annual | $24.99 | per year |


### IBUS Iso Manager

[App page](https://appshunter.io/ios/app/ibus-iso-manager/id6784258881)

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

**In-app purchases:** none


## Frequently asked questions

### Is Trigonometry Calculator. free?

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

### Is IBUS Iso Manager free?

IBUS Iso Manager is free to download, with no in-app purchases.

### Do Trigonometry Calculator. or IBUS Iso Manager have ads?

Trigonometry Calculator. shows ads; IBUS Iso Manager does not.

### Which is updated more often, Trigonometry Calculator. or IBUS Iso Manager?

Trigonometry Calculator. ships an update every 2 weeks, and IBUS Iso Manager every 11 days. Most recently, Trigonometry Calculator. was updated on September 9, 2026 and IBUS Iso Manager on September 19, 2026.

---

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