# Trigr vs Rafter Builder

The clearest difference is price: Rafter Builder at Free against Trigr's $1.99. Trigr's advantage is in-app purchases (none vs 2). On ads, device support and iOS requirement there is nothing between them.

Rafter Builder is free to download; Trigr costs $1.99 up front. Rafter Builder sells 2 in-app purchases, starting at $9.99 per month. Trigr asks for nothing beyond the download.

## The numbers

| Metric | Trigr | Rafter Builder |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/trigr-trigonometry-solver/id6448587882/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Daily | — |
| Monetization | Paid | — |
| Size | 66 MB | 3 MB |
| Requires iOS | **16.1** | 17.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Evolv Developments Pty. Ltd.](https://appshunter.io/developer/1679865917) | [Jalsaa](https://appshunter.io/developer/1451276283) |

## What reviewers say

### Trigr

[App page](https://appshunter.io/ios/app/trigr-trigonometry-solver/id6448587882)

This app quickly solves for all unknown measurements of right-angle and isosceles triangles using just two known values. It's designed for students, engineers, and builders needing accurate triangle calculations.

**Highlights:** Solves right-angle and isosceles triangles, Calculates all unknown measurements, Requires only two known values, User-friendly interface, Accurate calculations

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

**In-app purchases:** none


### Rafter Builder

[App page](https://appshunter.io/ios/app/rafter-builder-roof-framing/id6762499656)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Professional Monthly | $9.99 | per month |
| Professional Yearly | $69.99 | per year |


## Frequently asked questions

### Is Trigr free?

Trigr costs $1.99, with no in-app purchases.

### Is Rafter Builder free?

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

### Do Trigr or Rafter Builder have ads?

Neither Trigr nor Rafter Builder shows ads.

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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.*