# SPIRO vs Red Flags

The clearest difference is price: Red Flags at Free against SPIRO's $3.99. Red Flags also leads on update cadence (every 2 months vs every 7 months). SPIRO's advantage is in-app purchases (none vs 1) and iOS requirement (12.0 vs 16.0). On ads and device support there is nothing between them.

Red Flags is free to download; SPIRO costs $3.99 up front. Red Flags sells 1 in-app purchase, starting at $14.99 per year. SPIRO asks for nothing beyond the download.

SPIRO ships an update every 7 months, Red Flags every 2 months. The most recent releases landed on July 9, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | SPIRO | Red Flags |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 2 months** |
| Monetization | Paid | — |
| Size | 125 MB | 17 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 12+ | 17+ |
| Developer | [Universite Laval](https://appshunter.io/developer/386592978) | [Philippe FURGER](https://appshunter.io/developer/1055742280) |

## What reviewers say

### SPIRO

[App page](https://appshunter.io/ios/app/spiro/id1135982423)

This medical app assists healthcare professionals and students in interpreting spirometry tests. It provides diagnostic and treatment suggestions based on entered data and offers access to educational materials and respiratory health guidelines.

**Highlights:** Interpret spirometry tests, Diagnostic suggestions, Treatment suggestions, Access respiratory guidelines, Educational material, Patient follow-up tool

**In-app purchases:** none


### Red Flags

[App page](https://appshunter.io/ios/app/red-flags-warnsignale/id6670479640)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Jahr | $14.99 | per year |


## Frequently asked questions

### Is SPIRO free?

SPIRO costs $3.99, with no in-app purchases.

### Is Red Flags free?

Red Flags is free to download, with in-app purchases available.

### Do SPIRO or Red Flags have ads?

Neither SPIRO nor Red Flags shows ads.

### Which is updated more often, SPIRO or Red Flags?

SPIRO ships an update every 7 months, and Red Flags every 2 months. Most recently, SPIRO was updated on July 9, 2026 and Red Flags on September 22, 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.*