# MIR Spiro vs ClinicalKey

The clearest difference is monetization model: MIR Spiro at free against ClinicalKey's subscription. MIR Spiro also leads on iOS requirement (12.4 vs 15.5). ClinicalKey's advantage is device support (3 vs 1). On price, review sentiment, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

MIR Spiro ships an update every 2 months, ClinicalKey every 5 weeks. The most recent releases landed on October 7, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | MIR Spiro | ClinicalKey |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/mir-spiro/id947868756/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | **16.7% of reviews** | 8.8% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Monetization | **Free** | Subscription |
| Size | 23 MB | 68 MB |
| Requires iOS | **12.4** | 15.5 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | +12 |
| Developer | [MIR Medical International Research](https://appshunter.io/developer/1010662698) | [Elsevier Inc.](https://appshunter.io/developer/367031326) |

## What reviewers say

### MIR Spiro

[App page](https://appshunter.io/ios/app/mir-spiro/id947868756)

This iOS app enables real-time spirometry and oximetry testing on iPads for healthcare providers. It measures key lung function parameters and blood oxygen saturation, offering pediatric incentives and data transfer capabilities.

**Highlights:** Real-time spirometry testing, Real-time oximetry testing, Measures FVC, FEV1, PEF, %SpO2, Pulse Rate, Pediatric incentive feature, Data transfer for backup, HL7 standard support

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### ClinicalKey

[App page](https://appshunter.io/ios/app/clinicalkey/id1041998175)

This app provides medical professionals with instant access to a vast library of clinical knowledge, including synoptic content and in-depth reference materials. It helps users stay updated on medical advancements, confirm diagnoses, and advance their research skills, all while offering CME/MOC/CE credits.

**Highlights:** Access to 30+ medical specialties, Synoptic content for quick answers, Full-text reference books and journals, Mobile-optimized medical calculators, Earn CME/MOC/CE credits, Intuitive search functionality

**In-app purchases:** none

**What reviewers like**

- 📚 High-quality, evidence-based clinical content
- 🎯 Intuitive interface and quick reference format
- 🔍 Similar functionality to website version
- 👍 Browse feature restoration appreciated by users

**What reviewers complain about**

- 🔓 Constant forced logout issues
- 🔐 Institutional login authentication failures
- ⏳ App freezes and perpetual loading screens
- 🚫 Missing textbook access in app vs website
- 📵 Frequent crashes and force closures

**Reported bugs**

- App stuck on loading screen after initial login
- Forced logout when closing or minimizing app
- Institutional login not working despite web access
- App crashes during search queries
- OpenAthens authentication failures

**Requested features**

- PDF download capability within the app
- Favorite/bookmark textbooks and articles
- Landscape mode support for iPad
- Find-on-page text search function
- Automatic session persistence and page memory


## Frequently asked questions

### Is MIR Spiro free?

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

### Is ClinicalKey free?

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

### Do MIR Spiro or ClinicalKey have ads?

Neither MIR Spiro nor ClinicalKey shows ads.

### Which is updated more often, MIR Spiro or ClinicalKey?

MIR Spiro ships an update every 2 months, and ClinicalKey every 5 weeks. Most recently, MIR Spiro was updated on October 7, 2026 and ClinicalKey on October 29, 2026.

---

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