# ATTMA Air Tightness App vs Trigonometry Calculator.

The clearest difference is in-app purchases: ATTMA Air Tightness App at none against Trigonometry Calculator.'s 2. ATTMA Air Tightness App also leads on ads (none vs shown) and iOS requirement (11.0 vs 15.0). Trigonometry Calculator.'s advantage is update cadence (every 2 weeks vs every 2 months) and device support (3 vs 1). On price and review sentiment there is nothing between them.

Both are free to download. Trigonometry Calculator. sells 2 in-app purchases, starting at $2.99 per month. ATTMA Air Tightness App asks for nothing beyond the download.

ATTMA Air Tightness App ships an update every 2 months, Trigonometry Calculator. every 2 weeks. The most recent releases landed on June 10, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | ATTMA Air Tightness App | Trigonometry Calculator. |
| --- | --- | --- |
| 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 | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 30 MB | 64 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [AIR TIGHTNESS TESTING & MEASUREMENT ASSOCIATION](https://appshunter.io/developer/1547433680) | [Horitech](https://appshunter.io/developer/1794537335) |

## What reviewers say

### ATTMA Air Tightness App

[App page](https://appshunter.io/ios/app/attma-air-tightness-app/id1582610316)

This utility app helps organize and complete building air tightness testing according to various industry standards. It allows companies to upload site details for teams, and testers to record building and test information, including photos and deviations, before submitting results for certification.

**Highlights:** Organize building air tightness tests, Complete tests to TSL1, TSL2, CIBSE TM23, ASTM E779-19, BS EN 13829:2001 standards, Upload and allocate site/plot details, Record initial building and test details, Capture photos and preparations, Enter test values, Highlight deviations from test standards, Submit results for certification

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is ATTMA Air Tightness App free?

ATTMA Air Tightness App is free to download, with no in-app purchases.

### Is Trigonometry Calculator. free?

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

### Do ATTMA Air Tightness App or Trigonometry Calculator. have ads?

Trigonometry Calculator. shows ads; ATTMA Air Tightness App does not.

### Which is updated more often, ATTMA Air Tightness App or Trigonometry Calculator.?

ATTMA Air Tightness App ships an update every 2 months, and Trigonometry Calculator. every 2 weeks. Most recently, ATTMA Air Tightness App was updated on June 10, 2026 and Trigonometry Calculator. on September 9, 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.*