# Rang Dong Smart vs Số Lạ

The clearest difference is review sentiment: Số Lạ at 71% against Rang Dong Smart's 0%. Số Lạ also leads on rating (4.9 vs 4.6) and update cadence (every 6 weeks vs every 6 months). On price, ratings volume, 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.

Số Lạ holds the better App Store score, 4.9 against 4.6. Both are backed by a comparable volume of ratings — 31 and 18 respectively. Written reviews point the same way: 0% of Rang Dong Smart's written reviews are positive against 71% of Số Lạ's.

Rang Dong Smart ships an update every 6 months, Số Lạ every 6 weeks. The most recent releases landed on October 6, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Rang Dong Smart | Số Lạ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (31 ratings)](https://appshunter.io/ios/app/rang-dong-smart/id1453529638/reviews) | **[4.9 (18 ratings)](https://appshunter.io/ios/app/so-la/id6462660717/reviews)** |
| Number of ratings | **31** | 18 |
| Positive reviews | 0.0% of reviews | **71.4% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 6 weeks** |
| Monetization | Free | Free |
| Size | 218 MB | 36 MB |
| Requires iOS | **14.0** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [RANG DONG LIGHT SOURCE AND VACUUM FLASK JOINT STOCK COMPANY](https://appshunter.io/developer/1453529637) | [Tuan Anh Vu](https://appshunter.io/developer/398453365) |

## What reviewers say

### Rang Dong Smart

[App page](https://appshunter.io/ios/app/rang-dong-smart/id1453529638)

Control and monitor your smart home devices remotely. Create custom automation scenes and schedules for precise device management. Share device access with family members for easy, anytime, anywhere control.

**Highlights:** Connect and control smart devices, Create automation scenes, Schedule timers and countdowns, Share device access with family, Real-time device monitoring, Remote control anytime, anywhere

**Features:** Vision Pro support

**In-app purchases:** none


### Số Lạ

[App page](https://appshunter.io/ios/app/so-la/id6462660717)

This app identifies spam calls and displays caller ID, featuring a large blacklist of unwanted callers. It also provides a comprehensive directory of Vietnamese businesses and individuals, and allows reporting of fraudulent bank accounts. Enhanced features are available for newer iOS versions.

**Highlights:** Spam call identification, Caller ID display, Extensive blacklist, Vietnamese business directory, Fraudulent bank account reporting, Live Caller ID Lookup (iOS 18+)

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

**In-app purchases:** none


## Frequently asked questions

### Is Rang Dong Smart free?

Rang Dong Smart is free to download, with no in-app purchases.

### Is Số Lạ free?

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

### Which has better reviews, Rang Dong Smart or Số Lạ?

Số Lạ is rated higher. Rang Dong Smart averages 4.6 out of 5 from 31 ratings, while Số Lạ averages 4.9 from 18 ratings.

### Do Rang Dong Smart or Số Lạ have ads?

Neither Rang Dong Smart nor Số Lạ shows ads.

### Which is updated more often, Rang Dong Smart or Số Lạ?

Rang Dong Smart ships an update every 6 months, and Số Lạ every 6 weeks. Most recently, Rang Dong Smart was updated on October 6, 2026 and Số Lạ on October 8, 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.*