# e vs Triangle3

The clearest difference is review sentiment: Triangle3 at 40% against e's 0%. Triangle3 also leads on update cadence (every 5 weeks vs every 6 months). e's advantage is price ($0.99 vs $3.99) and iOS requirement (12.0 vs 15.0). On ads, in-app purchases, monetization model and device support there is nothing between them.

e costs $0.99 and Triangle3 $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

e ships an update every 6 months, Triangle3 every 5 weeks. The most recent releases landed on September 18, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | e | Triangle3 |
| --- | --- | --- |
| Price | **$0.99** | $3.99 |
| Positive reviews | 0.0% of reviews | **40.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 5 weeks** |
| Monetization | Paid | Paid |
| Size | 10 MB | 7 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [e-skett Corp.](https://appshunter.io/developer/591591895) | [ryo sasaki](https://appshunter.io/developer/318552526) |

## What reviewers say

### e

[App page](https://appshunter.io/ios/app/e-calcpro/id603391408)

A powerful calculator app supporting scientific and engineering notation with a wide range of functions and constants. It offers features like calculation history, user-defined variables, and formula insertion for complex computations.

**Highlights:** Scientific and engineering notation, Calculation history, User-defined constants and variables, Advanced mathematical functions, Formula insertion, Autocomplete parentheses

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

**In-app purchases:** none


### Triangle3

[App page](https://appshunter.io/ios/app/triangle3/id1643788233)

This app provides advanced calculation tools for field work, specializing in right and unequal triangles. It supports complex shapes like cones, pipes, and screw wings, with AR visualization for floor plans. It also includes standard calculator functions and memory features.

**Highlights:** Right and unequal triangle calculations, Complex shape development (cones, pipes, etc.), Augmented Reality (AR) floor plan visualization, Standard calculator functions with memory, Trigonometric and cosine theorem calculations, PCD and screw wing calculations

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is e free?

e costs $0.99, with no in-app purchases.

### Is Triangle3 free?

Triangle3 costs $3.99, with no in-app purchases.

### Do e or Triangle3 have ads?

Neither e nor Triangle3 shows ads.

### Which is updated more often, e or Triangle3?

e ships an update every 6 months, and Triangle3 every 5 weeks. Most recently, e was updated on September 18, 2026 and Triangle3 on September 13, 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.*