# Trigonometry Help vs レコーダー

The clearest difference is price: レコーダー at Free against Trigonometry Help's $1.99. レコーダー also leads on in-app purchases (none vs 3). Trigonometry Help's advantage is iOS requirement (10.0 vs 12.2). On update cadence, ads and device support there is nothing between them.

レコーダー is free to download; Trigonometry Help costs $1.99 up front. Trigonometry Help sells 3 one-off in-app purchases. レコーダー asks for nothing beyond the download.

Trigonometry Help ships an update every 13 months, レコーダー every 20 months. The most recent releases landed on September 23, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Trigonometry Help | レコーダー |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[4.7 (477 ratings)](https://appshunter.io/ios/app/trigonometry-help/id411415648/reviews)** | — |
| Number of ratings | **477** | — |
| Positive reviews | 90.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 13 months** | Every 20 months |
| Monetization | Free with in-app purchases | — |
| Size | 21 MB | 1 MB |
| Requires iOS | **10.0** | 12.2 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | +4 | 4+ |
| Developer | [Armchair Engineering](https://appshunter.io/developer/398901339) | [SpeakBUDDY Ltd.](https://appshunter.io/developer/633270154) |

## What reviewers say

### Trigonometry Help

[App page](https://appshunter.io/ios/app/trigonometry-help/id411415648)

This app helps you quickly solve for unknown angles and sides of right-angled triangles. It provides a workings view for understanding the math, a scale drawing of the triangle, and a reference for basic trigonometric formulas. You can input angles in various formats and choose your desired decimal precision.

**Highlights:** Solve right-angled triangles, Workings view for solutions, Scale drawing of solved triangle, Basic trig formulae reference, Multiple angle input formats, Customizable decimal places

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Trig Help Premium | $0.99 | one-time |
| Trig Help Premium | $1.99 | one-time |
| Trig Help Premium | $3.99 | one-time |

**What reviewers like**

- 🚀 Quick and easy to use
- 👍 User-friendly interface
- 🔧 Helpful for tradesmen and professionals
- ⚙️ Accurate calculations
- 🔍 Convenient for on-site use

**What reviewers complain about**

- 🔢 Limited to right-angled triangles only
- 🔍 Lacks advanced trig functions
- 🔀 No option to rotate/flip the triangle view

**Reported bugs**

- Inconsistent performance on older devices
- Occasional crashes or freezes

**Requested features**

- Support for irregular triangles
- Ability to show step-by-step workings
- Option to switch between degrees/minutes/seconds and decimal values


### レコーダー

[App page](https://appshunter.io/ios/app/id1469874020)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Trigonometry Help free?

Trigonometry Help costs $1.99, and also offers in-app purchases.

### Is レコーダー free?

レコーダー is free to download, with no in-app purchases.

### Do Trigonometry Help or レコーダー have ads?

Neither Trigonometry Help nor レコーダー shows ads.

### Which is updated more often, Trigonometry Help or レコーダー?

Trigonometry Help ships an update every 13 months, and レコーダー every 20 months. Most recently, Trigonometry Help was updated on September 23, 2026 and レコーダー on September 19, 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.*