# STF Sleep Research vs CypherAir

The clearest difference is update cadence: CypherAir at every 2 days against STF Sleep Research's every 5 weeks. CypherAir also leads on device support (4 vs 2). STF Sleep Research's advantage is iOS requirement (10.0 vs 26.5). On price, 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.

STF Sleep Research ships an update every 5 weeks, CypherAir every 2 days. Both last shipped on October 25, 2026.

## The numbers

| Metric | STF Sleep Research | CypherAir |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.3 (3 ratings)](https://appshunter.io/ios/app/stf-sleep-research/id1345157553/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 2 days** |
| Monetization | Free | — |
| Size | 117 MB | 79 MB |
| Requires iOS | **10.0** | 26.5 |
| Devices | iPhone, iPod | **iPhone, iPad, Mac, Vision Pro** |
| Age rating | 4+ | 4+ |
| Developer | [Zepp Inc.](https://appshunter.io/developer/938688460) | [康 陈](https://appshunter.io/developer/1862348574) |

## What reviewers say

### STF Sleep Research

[App page](https://appshunter.io/ios/app/stf-sleep-research/id1345157553)

This utility app synchronizes health data from wearable devices to Apple Health. It assists researchers in studying sleep sciences by collecting steps, sleep, and heart rate information. Authorization is required to enable data syncing.

**Highlights:** Track paired wearing equipment data, Sync steps, sleep, and heart rate, Integrates with Apple Health, Supports sleep science research, Concise and straightforward interface

**Features:** macOS Compatibility

**In-app purchases:** none


### CypherAir

[App page](https://appshunter.io/ios/app/cypherair/id6760628384)

**In-app purchases:** none


## Frequently asked questions

### Is STF Sleep Research free?

STF Sleep Research is free to download, with no in-app purchases.

### Is CypherAir free?

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

### Do STF Sleep Research or CypherAir have ads?

Neither STF Sleep Research nor CypherAir shows ads.

### Which is updated more often, STF Sleep Research or CypherAir?

STF Sleep Research ships an update every 5 weeks, and CypherAir every 2 days. Most recently, STF Sleep Research was updated on October 25, 2026 and CypherAir on October 25, 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.*