# SIRS vs PE Classifier

The clearest difference is update cadence: SIRS at every 5 days against PE Classifier's monthly. SIRS also leads on iOS requirement (11.0 vs 15.1). On price, ads, 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.

SIRS ships an update every 5 days, PE Classifier monthly. The most recent releases landed on October 5, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | SIRS | PE Classifier |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/pe-classifier/id6781558435/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 days** | Monthly |
| Monetization | — | Free |
| Size | 34 MB | 24 MB |
| Requires iOS | **11.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 17+ |
| Developer | [Adnan Ashraf](https://appshunter.io/developer/1212120305) | [Dawwod George](https://appshunter.io/developer/6781558437) |

## What reviewers say

### SIRS

[App page](https://appshunter.io/ios/app/sirs-2023/id6458100492)

**Features:** macOS Compatibility

**In-app purchases:** none


### PE Classifier

[App page](https://appshunter.io/ios/app/pe-classifier/id6781558435)

This educational reference tool helps medical professionals and students understand and apply the latest acute pulmonary embolism classification system. It features interactive diagrams, a built-in checklist, and direct links to source guidelines for comprehensive learning.

**Highlights:** Full Category A-E classification with sub-stages, Interactive visual diagrams, Built-in HESTIA checklist, Optional local case log, Direct link to source guideline

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

**In-app purchases:** none


## Frequently asked questions

### Is SIRS free?

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

### Is PE Classifier free?

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

### Do SIRS or PE Classifier have ads?

Neither SIRS nor PE Classifier shows ads.

### Which is updated more often, SIRS or PE Classifier?

SIRS ships an update every 5 days, and PE Classifier monthly. Most recently, SIRS was updated on October 5, 2026 and PE Classifier on September 18, 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.*