# Sphera Duo vs OET

The clearest difference is iOS requirement: Sphera Duo at 9.0 against OET's 14.0. 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.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Sphera Duo | OET |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 16.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Free | — |
| Size | 9 MB | 10 MB |
| Requires iOS | **9.0** | 14.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [TRANWO TECHNOLOGY CORP.](https://appshunter.io/developer/595251459) | [scribos GmbH](https://appshunter.io/developer/1305858254) |

## What reviewers say

### Sphera Duo

[App page](https://appshunter.io/ios/app/sphera-duo/id1332468000)

This app allows you to monitor your baby remotely using an HD camera with pan and tilt features. It offers two-way talk, lullabies, and alerts for temperature and low battery. The companion monitor features a touch screen and long battery life.

**Highlights:** HD 720P camera, Motorized Pan & Tilt, Two-way talk, Voice-operated switch (VOX), Room temperature alerts, Push notifications

**Features:** macOS Compatibility

**In-app purchases:** none


### OET

[App page](https://appshunter.io/ios/app/oet/id6754333547)

**In-app purchases:** none


## Frequently asked questions

### Is Sphera Duo free?

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

### Is OET free?

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

### Do Sphera Duo or OET have ads?

Neither Sphera Duo nor OET shows ads.

### Which is updated more often, Sphera Duo or OET?

Sphera Duo ships an update every 2 months, and OET every 2 months. Most recently, Sphera Duo was updated on October 24, 2026 and OET on October 28, 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.*