# Triamudom eBook vs PhET Simulations

The clearest difference is price: Triamudom eBook at Free against PhET Simulations's $0.99. Triamudom eBook also leads on update cadence (every 5 months vs every 14 months) and iOS requirement (8.3 vs 15.0). PhET Simulations's advantage is chart position (#40 vs unranked). On ads, in-app purchases and device support there is nothing between them.

Triamudom eBook is free to download; PhET Simulations costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Triamudom eBook ships an update every 5 months, PhET Simulations every 14 months. The most recent releases landed on November 6, 2026 and November 11, 2026 respectively.

## The numbers

| Metric | Triamudom eBook | PhET Simulations |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | — | **[4.5 (48 ratings)](https://appshunter.io/ios/app/phet-simulations/id1134126831/reviews)** |
| Number of ratings | — | **48** |
| Positive reviews | — | 65.5% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 14 months |
| Monetization | — | Paid |
| Best chart rank | — | **#40** |
| Size | 27 MB | 125 MB |
| Requires iOS | **8.3** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Openserve Co.,Ltd.](https://appshunter.io/developer/479158615) | [University of Colorado Boulder](https://appshunter.io/developer/972210292) |

## What reviewers say

### Triamudom eBook

[App page](https://appshunter.io/ios/app/triamudom-ebook/id885308671)

**Features:** macOS Compatibility

**In-app purchases:** none


### PhET Simulations

[App page](https://appshunter.io/ios/app/phet-simulations/id1134126831)

**Currently charting:** #40 Top Paid · Education (US App Store)

Explore science and math concepts through interactive simulations. This app provides over 75 HTML5 simulations for learning about atoms, energy, multiplication, and more. It's ideal for students, parents, and educators, offering offline access and multiple language support.

**Highlights:** Interactive science and math simulations, Offline play capability, Multiple language support, Customizable favorites collection, Automatic simulation updates, Easy simulation sorting

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

**In-app purchases:** none


## Frequently asked questions

### Is Triamudom eBook free?

Triamudom eBook is free to download, with no in-app purchases.

### Is PhET Simulations free?

PhET Simulations costs $0.99, with no in-app purchases.

### Do Triamudom eBook or PhET Simulations have ads?

Neither Triamudom eBook nor PhET Simulations shows ads.

### Which is updated more often, Triamudom eBook or PhET Simulations?

Triamudom eBook ships an update every 5 months, and PhET Simulations every 14 months. Most recently, Triamudom eBook was updated on November 6, 2026 and PhET Simulations on November 11, 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.*