# Lighttrio Smart vs 21 Day Challenge

The clearest difference is iOS requirement: 21 Day Challenge at 9.0 against Lighttrio Smart's 13.0. On price, update cadence, 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.

Lighttrio Smart ships an update every 5 months, 21 Day Challenge every 9 months. The most recent releases landed on November 3, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Lighttrio Smart | 21 Day Challenge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/lighttrio-smart/id1475603910/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 9 months |
| Monetization | Free | — |
| Size | 224 MB | 99 MB |
| Requires iOS | 13.0 | **9.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [ITTHIRIT NICE CORPORATION PUBLIC COMPANY LIMITED](https://appshunter.io/developer/1475603909) | [Phanupong Sanmee](https://appshunter.io/developer/1435296424) |

## What reviewers say

### Lighttrio Smart

[App page](https://appshunter.io/ios/app/lighttrio-smart/id1475603910)

Control your smart home devices remotely from anywhere. Receive real-time alerts for enhanced safety and easily share device access with family members. Setup is quick and straightforward.

**Highlights:** Add new devices easily, Remote device control, Real-time safety alerts, Share devices with family

**In-app purchases:** none


### 21 Day Challenge

[App page](https://appshunter.io/ios/app/21-day-challenge/id1504278610)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Lighttrio Smart free?

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

### Is 21 Day Challenge free?

21 Day Challenge is free to download, with no in-app purchases.

### Do Lighttrio Smart or 21 Day Challenge have ads?

Neither Lighttrio Smart nor 21 Day Challenge shows ads.

### Which is updated more often, Lighttrio Smart or 21 Day Challenge?

Lighttrio Smart ships an update every 5 months, and 21 Day Challenge every 9 months. Most recently, Lighttrio Smart was updated on November 3, 2026 and 21 Day Challenge on November 7, 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.*