# KOTP vs 레일휘슬

The clearest difference is update cadence: KOTP at monthly against 레일휘슬's every 8 months. KOTP also leads on iOS requirement (7.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

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

KOTP ships an update monthly, 레일휘슬 every 8 months. The most recent releases landed on October 11, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | KOTP | 레일휘슬 |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 8 months |
| Monetization | Free | — |
| Size | 12 MB | 23 MB |
| Requires iOS | **7.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [UINS](https://appshunter.io/developer/541596301) | [한국철도공사](https://appshunter.io/developer/404736496) |

## What reviewers say

### KOTP

[App page](https://appshunter.io/ios/app/kotp/id1088200091)

This app provides a secure one-time password (OTP) service for road traffic safety corporation services. It ensures authentication for accessing important road traffic information and services.

**Highlights:** One-time password generation, Secure authentication, Access to road traffic services, OTP for road traffic corporation

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

**In-app purchases:** none


### 레일휘슬

[App page](https://appshunter.io/ios/app/id1532691741)

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

**In-app purchases:** none


## Frequently asked questions

### Is KOTP free?

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

### Is 레일휘슬 free?

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

### Do KOTP or 레일휘슬 have ads?

Neither KOTP nor 레일휘슬 shows ads.

### Which is updated more often, KOTP or 레일휘슬?

KOTP ships an update monthly, and 레일휘슬 every 8 months. Most recently, KOTP was updated on October 11, 2026 and 레일휘슬 on October 9, 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.*