# Sereniby vs Transtec

The clearest difference is update cadence: Transtec at every 2 days against Sereniby's every 3 weeks. Sereniby's advantage is iOS requirement (13.0 vs 16.0). 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.

Sereniby ships an update every 3 weeks, Transtec every 2 days. The most recent releases landed on October 24, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Sereniby | Transtec |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.8 (5 ratings)](https://appshunter.io/ios/app/sereniby/id6569216382/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 days** |
| Monetization | Free | — |
| Size | 116 MB | 3 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Sereniby, Inc.](https://appshunter.io/developer/1758798147) | [Konvert, LLC.](https://appshunter.io/developer/1360620900) |

## What reviewers say

### Sereniby

[App page](https://appshunter.io/ios/app/sereniby/id6569216382)

Control your smart air purifier remotely, monitor your baby's room environment in real-time, and receive maintenance alerts. Optimize air quality and comfort with customizable schedules and automatic adjustments for a safe and healthy space.

**Highlights:** Remote smart purifier control, Real-time air quality monitoring, Customizable schedules, Automatic purification adjustments, Maintenance reminders and filter ordering

**In-app purchases:** none


### Transtec

[App page](https://appshunter.io/ios/app/transtec/id6793521682)

**In-app purchases:** none


## Frequently asked questions

### Is Sereniby free?

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

### Is Transtec free?

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

### Do Sereniby or Transtec have ads?

Neither Sereniby nor Transtec shows ads.

### Which is updated more often, Sereniby or Transtec?

Sereniby ships an update every 3 weeks, and Transtec every 2 days. Most recently, Sereniby was updated on October 24, 2026 and Transtec 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.*