# Chairo vs TrigIt

The clearest difference is in-app purchases: Chairo at none against TrigIt's 2. Chairo also leads on update cadence (every 2 months vs every 4 months) and iOS requirement (13.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. TrigIt sells 2 one-off in-app purchases. Chairo asks for nothing beyond the download.

Chairo ships an update every 2 months, TrigIt every 4 months. The most recent releases landed on September 7, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | Chairo | TrigIt |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 4 months |
| Monetization | — | Free with in-app purchases |
| Size | 28 MB | 23 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [WARRAGUL DISTRICT PARENT CONTROLLED CHRISTIAN SCHOOL ASSOCIATION INC](https://appshunter.io/developer/1427135171) | [SAPHI PTY LTD](https://appshunter.io/developer/1529776151) |

## What reviewers say

### Chairo

[App page](https://appshunter.io/ios/app/chairo/id1427135172)

**Features:** macOS Compatibility

**In-app purchases:** none


### TrigIt

[App page](https://appshunter.io/ios/app/trigit/id1529776149)

This app lets you apply trigonometry to real-world situations using your phone's camera and sensors. Measure angles and calculate heights of objects like trees or buildings. It generates clear diagrams and saves them for later use.

**Highlights:** Angle measurement tool, Inclinometer with camera/gyroscope, Adjustable offset for measurements, Generates clear diagrams, Saves diagrams to camera roll, Measures in metric or imperial units

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Worked Solution Consumable | $0.99 | one-time |
| Worked Solution | $1.99 | one-time |


## Frequently asked questions

### Is Chairo free?

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

### Is TrigIt free?

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

### Do Chairo or TrigIt have ads?

Neither Chairo nor TrigIt shows ads.

### Which is updated more often, Chairo or TrigIt?

Chairo ships an update every 2 months, and TrigIt every 4 months. Most recently, Chairo was updated on September 7, 2026 and TrigIt on September 8, 2026.

---

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