# BioFlash vs Triangle Sketch

The clearest difference is price: BioFlash at Free against Triangle Sketch's $0.99. Triangle Sketch's advantage is in-app purchases (none vs 1) and update cadence (monthly vs every 7 months). On ads, device support and iOS requirement there is nothing between them.

BioFlash is free to download; Triangle Sketch costs $0.99 up front. BioFlash sells 1 in-app purchase, starting at $9.99 per year. Triangle Sketch asks for nothing beyond the download.

BioFlash ships an update every 7 months, Triangle Sketch monthly. The most recent releases landed on October 24, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | BioFlash | Triangle Sketch |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/triangle-sketch/id6795052381/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 7 months | **Monthly** |
| Monetization | — | Paid |
| Size | 44 MB | 5 MB |
| Requires iOS | **16.4** | 17.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 9+ | 4+ |
| Developer | [Gentiana Etemi](https://appshunter.io/developer/1883027493) | [Eduardo Longoria Alaniz](https://appshunter.io/developer/6795052383) |

## What reviewers say

### BioFlash

[App page](https://appshunter.io/ios/app/bioflash-glossary/id6760253478)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| BioFlash Premium | $9.99 | per year |


### Triangle Sketch

[App page](https://appshunter.io/ios/app/triangle-sketch/id6795052381)

This geometry tool allows users to draw and manipulate triangles on a graph. It provides measurements, allows editing of sides and angles, and displays various triangle facts and properties. It's designed to help students visualize geometric concepts.

**Highlights:** Draw triangles on a graph, Edit side lengths and angles, View triangle measurements, Explore triangle properties, Use right-triangle trig tools, Customize display options

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

**In-app purchases:** none


## Frequently asked questions

### Is BioFlash free?

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

### Is Triangle Sketch free?

Triangle Sketch costs $0.99, with no in-app purchases.

### Do BioFlash or Triangle Sketch have ads?

Neither BioFlash nor Triangle Sketch shows ads.

### Which is updated more often, BioFlash or Triangle Sketch?

BioFlash ships an update every 7 months, and Triangle Sketch monthly. Most recently, BioFlash was updated on October 24, 2026 and Triangle Sketch on October 18, 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.*