# Visual Trig Func vs Heron's Formula Calculator

The clearest difference is price: Visual Trig Func at Free against Heron's Formula Calculator's $2.99. Visual Trig Func also leads on update cadence (every 5 months vs every 12 months) and iOS requirement (14.0 vs 16.0). Heron's Formula Calculator's advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support there is nothing between them.

Visual Trig Func is free to download; Heron's Formula Calculator costs $2.99 up front. Visual Trig Func sells 1 one-off in-app purchase. Heron's Formula Calculator asks for nothing beyond the download.

Visual Trig Func ships an update every 5 months, Heron's Formula Calculator every 12 months. The most recent releases landed on June 1, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Visual Trig Func | Heron's Formula Calculator |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[1.0 (2 ratings)](https://appshunter.io/ios/app/visual-trig-func/id645214237/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 61.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 5 months** | Every 12 months |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 4 MB | 3 MB |
| Requires iOS | **14.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [yukihiro fujita](https://appshunter.io/developer/537078708) | [kotobaz](https://appshunter.io/developer/1634727152) |

## What reviewers say

### Visual Trig Func

[App page](https://appshunter.io/ios/app/visual-trig-func/id645214237)

This app visually demonstrates trigonometric functions, making them easier to understand and calculate. It offers interactive tools for exploring values, viewing wave graphs, and accessing lists of trigonometric ratios. Ideal for students and educators seeking a clearer grasp of trigonometry.

**Highlights:** Visual trigonometric functions, Interactive radius and angle manipulation, Comprehensive lists of trig ratios, Wave graph visualizations, Adjustable values via text fields, Tap-to-check degree and value functionality

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Add Calculation 360!   (You can calc trig functions for over 90 degrees.) | $0.99 | one-time |


### Heron's Formula Calculator

[App page](https://appshunter.io/ios/app/herons-formula-calculator/id1634727150)

Calculate the area of any triangle using only the lengths of its three sides. Simply input the side lengths and get an instant result.

**Highlights:** Calculate triangle area, Input three side lengths, Instant calculation results, Simple user interface

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

**In-app purchases:** none


## Frequently asked questions

### Is Visual Trig Func free?

Visual Trig Func is free to download, with in-app purchases available.

### Is Heron's Formula Calculator free?

Heron's Formula Calculator costs $2.99, with no in-app purchases.

### Do Visual Trig Func or Heron's Formula Calculator have ads?

Visual Trig Func shows ads; Heron's Formula Calculator does not.

### Which is updated more often, Visual Trig Func or Heron's Formula Calculator?

Visual Trig Func ships an update every 5 months, and Heron's Formula Calculator every 12 months. Most recently, Visual Trig Func was updated on June 1, 2026 and Heron's Formula Calculator on September 23, 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.*