# FeNO Learn by NIOX® vs useit

The clearest difference is ads: useit at none against FeNO Learn by NIOX®'s shown. useit also leads on update cadence (fortnightly vs every 2 months). FeNO Learn by NIOX®'s advantage is iOS requirement (12.0 vs 15.6). On price, 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.

FeNO Learn by NIOX® ships an update every 2 months, useit fortnightly. The most recent releases landed on September 25, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | FeNO Learn by NIOX® | useit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/feno-learn-by-niox/id1673279639/reviews)** | — |
| Number of ratings | **3** | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | Ad-supported | — |
| Size | 21 MB | 61 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 17+ |
| Developer | [NIOX Group PLC](https://appshunter.io/developer/1673279641) | [Suresh Paranjothy](https://appshunter.io/developer/1587131308) |

## What reviewers say

### FeNO Learn by NIOX®

[App page](https://appshunter.io/ios/app/feno-learn-by-niox/id1673279639)

This app provides healthcare professionals with in-depth educational modules on fractional exhaled nitric oxide (FeNO) testing and interpretation. It offers case studies and resources to enhance asthma care and clinical decision-making.

**Highlights:** In-depth FeNO testing insights, Advanced learning modules, Clinical integration guidance, Real-world case studies, Curated respiratory health resources

**Features:** macOS Compatibility

**In-app purchases:** none


### useit

[App page](https://appshunter.io/ios/app/useit/id6747667589)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is FeNO Learn by NIOX® free?

FeNO Learn by NIOX® is free to download, with no in-app purchases.

### Is useit free?

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

### Do FeNO Learn by NIOX® or useit have ads?

FeNO Learn by NIOX® shows ads; useit does not.

### Which is updated more often, FeNO Learn by NIOX® or useit?

FeNO Learn by NIOX® ships an update every 2 months, and useit fortnightly. Most recently, FeNO Learn by NIOX® was updated on September 25, 2026 and useit on September 30, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*