# Isosceles Triangle PRO vs InkDeck

The clearest difference is price: InkDeck at Free against Isosceles Triangle PRO's $2.99. InkDeck also leads on update cadence (every 2 weeks vs monthly). Isosceles Triangle PRO's advantage is rating (5.0 vs 4.0) and in-app purchases (none vs 3). On ratings volume, ads, device support and iOS requirement there is nothing between them.

InkDeck is free to download; Isosceles Triangle PRO costs $2.99 up front. InkDeck sells 3 in-app purchases, starting at $2.99 per month. Isosceles Triangle PRO asks for nothing beyond the download.

Isosceles Triangle PRO holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

Isosceles Triangle PRO ships an update monthly, InkDeck every 2 weeks. The most recent releases landed on October 21, 2026 and October 23, 2026 respectively.

## The numbers

| Metric | Isosceles Triangle PRO | InkDeck |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/isosceles-triangle-pro/id1568944096/reviews)** | [4.0 (1 ratings)](https://appshunter.io/ios/app/inkdeck-flashcards/id1602851047/reviews) |
| Number of ratings | **2** | 1 |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 180 MB | 22 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Glindemann, Sennoun, Langer GbR](https://appshunter.io/developer/1024972809) | [Muhammad Mukhtar](https://appshunter.io/developer/1515029563) |

## What reviewers say

### Isosceles Triangle PRO

[App page](https://appshunter.io/ios/app/isosceles-triangle-pro/id1568944096)

Calculate all properties of an isosceles triangle, whether acute or obtuse. Input known values to see formulas and results. Supports decimals, fractions, and step-by-step solutions with history saving and sharing.

**Highlights:** Calculate all isosceles triangle quantities, Display formulas for calculations, Supports acute and obtuse triangles, Handles decimals and fractions, Step-by-step solution display, History function for saved calculations, Adjustable decimal places

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

**In-app purchases:** none


### InkDeck

[App page](https://appshunter.io/ios/app/inkdeck-flashcards/id1602851047)

Create and study flashcards with handwritten notes and drawings. Supports spaced repetition, multiple study modes, and engaging games to make learning fun. Syncs across devices via iCloud without an account.

**Highlights:** Handwritten notes and drawings, Spaced repetition system, Multiple study modes (Quiz, Typing, Match), Four built-in study games, Import Anki and CSV decks, Progress tracking and stats, iCloud sync across devices

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| App Access For 1 Month | $2.99 | per month |
| App Access For 1 Year | $24.99 | per year |
| Unlimited cards | $7.99 | one-time |


## Frequently asked questions

### Is Isosceles Triangle PRO free?

Isosceles Triangle PRO costs $2.99, with no in-app purchases.

### Is InkDeck free?

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

### Which has better reviews, Isosceles Triangle PRO or InkDeck?

Isosceles Triangle PRO is rated higher. Isosceles Triangle PRO averages 5.0 out of 5 from 2 ratings, while InkDeck averages 4.0 from 1 ratings.

### Do Isosceles Triangle PRO or InkDeck have ads?

Neither Isosceles Triangle PRO nor InkDeck shows ads.

### Which is updated more often, Isosceles Triangle PRO or InkDeck?

Isosceles Triangle PRO ships an update monthly, and InkDeck every 2 weeks. Most recently, Isosceles Triangle PRO was updated on October 21, 2026 and InkDeck on October 23, 2026.

---

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