# TriFAn vs OTOTETSU

The clearest difference is update cadence: TriFAn at fortnightly against OTOTETSU's every 2 months. TriFAn also leads on iOS requirement (9.3 vs 15.0). OTOTETSU's advantage is device support (3 vs 1). On price, review sentiment, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

TriFAn ships an update fortnightly, OTOTETSU every 2 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | TriFAn | OTOTETSU |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (19 ratings)](https://appshunter.io/ios/app/ototetsu/id1557885726/reviews)** |
| Number of ratings | — | **19** |
| Positive reviews | **100.0% of reviews** | 93.1% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 months |
| Monetization | Free | Free |
| Size | 6 MB | 20 MB |
| Requires iOS | **9.3** | 15.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Holger Maass](https://appshunter.io/developer/886261996) | [Hisato Takeuchi](https://appshunter.io/developer/1512764876) |

## What reviewers say

### TriFAn

[App page](https://appshunter.io/ios/app/trifan/id1143306918)

Enhance your train simulation experience with a realistic electronic timetable display. This add-on requires the "Zusi 3" train simulator to function.

**Highlights:** Electronic Timetable Display (ETD) simulation, EBuLa functionality, Add-on for Zusi 3, Realistic modern locomotive gauge

**Features:** macOS Compatibility

**In-app purchases:** none


### OTOTETSU

[App page](https://appshunter.io/ios/app/ototetsu/id1557885726)

This app simulates the characteristic sounds of electric trains, generated by inverters controlling motor torque and speed. Users can design sounds for imaginary trains by manipulating waveforms and motor sounds.

**Highlights:** Simulates electric train acceleration/deceleration sounds, Generates waveforms from inverters, Simulates motor sounds, Design imaginary train sounds, Customize torque and rotational speed effects

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

**In-app purchases:** none


## Frequently asked questions

### Is TriFAn free?

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

### Is OTOTETSU free?

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

### Do TriFAn or OTOTETSU have ads?

Neither TriFAn nor OTOTETSU shows ads.

### Which is updated more often, TriFAn or OTOTETSU?

TriFAn ships an update fortnightly, and OTOTETSU every 2 months. Most recently, TriFAn was updated on November 2, 2026 and OTOTETSU on November 3, 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.*