# 3 ชั้น vs Otteri

The clearest difference is rating: Otteri at 2.0 against 3 ชั้น's 1.0. Otteri also leads on update cadence (every 3 weeks vs every 8 months). 3 ชั้น's advantage is iOS requirement (13.0 vs 15.5). On price, review sentiment, ratings volume and ads there is nothing between them.

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

Otteri holds the better App Store score, 2.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews complicate that: 4% of 3 ชั้น's written reviews are positive against 0% of Otteri's, so the app with the better star average is not the one people write more warmly about.

3 ชั้น ships an update every 8 months, Otteri every 3 weeks. The most recent releases landed on October 15, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | 3 ชั้น | Otteri |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/3/id1295531411/reviews) | **[2.0 (1 ratings)](https://appshunter.io/ios/app/otteri/id1480384859/reviews)** |
| Number of ratings | 1 | 1 |
| Positive reviews | **4.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 145 MB | 103 MB |
| Requires iOS | **13.0** | 15.5 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Office of The National Broadcasting and Telecommunications Commission](https://appshunter.io/developer/721507053) | [Kavin Nitasnajarukul](https://appshunter.io/developer/1469331007) |

## What reviewers say

### 3 ชั้น

[App page](https://appshunter.io/ios/app/3/id1295531411)

This app allows users to check mobile number registrations, report suspicious or missing numbers, and lock their identity to prevent unauthorized SIM card registrations. Users can also unlock their identity through the application.

**Highlights:** Check mobile number registrations, Report suspicious numbers, Report missing numbers, Lock SIM registration, Unlock SIM registration

**Features:** macOS Compatibility

**In-app purchases:** none


### Otteri

[App page](https://appshunter.io/ios/app/otteri/id1480384859)

This application connects users to a modern laundry service featuring industrial washers and dryers. Manage your laundry needs, check machine availability, and receive notifications when your cycle is complete. Enjoy promotions and easily locate service areas.

**Highlights:** Industrial washer and dryer booking, Real-time machine status checks, Operation time monitoring, Completion notifications, Price promotions, Service area locator

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

**In-app purchases:** none


## Frequently asked questions

### Is 3 ชั้น free?

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

### Is Otteri free?

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

### Which has better reviews, 3 ชั้น or Otteri?

Otteri is rated higher. 3 ชั้น averages 1.0 out of 5 from 1 ratings, while Otteri averages 2.0 from 1 ratings.

### Do 3 ชั้น or Otteri have ads?

Neither 3 ชั้น nor Otteri shows ads.

### Which is updated more often, 3 ชั้น or Otteri?

3 ชั้น ships an update every 8 months, and Otteri every 3 weeks. Most recently, 3 ชั้น was updated on October 15, 2026 and Otteri on September 26, 2026.

---

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