# Periop Pacemaker vs VentRef

The clearest difference is in-app purchases: VentRef at none against Periop Pacemaker's 2. VentRef also leads on update cadence (every 3 weeks vs every 2 months) and ratings volume (42 vs 8). Periop Pacemaker's advantage is iOS requirement (13.0 vs 26.0). On price, rating, review sentiment and ads there is nothing between them.

Both are free to download. Periop Pacemaker sells 2 in-app purchases, starting at $2.99 per year. VentRef asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Periop Pacemaker against 5.0 for VentRef. That said, the two scores are not equally well evidenced: VentRef has 42 ratings behind it against 8, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

Periop Pacemaker ships an update every 2 months, VentRef every 3 weeks. The most recent releases landed on September 9, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Periop Pacemaker | VentRef |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (8 ratings)](https://appshunter.io/ios/app/periop-pacemaker/id6615070538/reviews) | [5.0 (42 ratings)](https://appshunter.io/ios/app/ventref/id6756503414/reviews) |
| Number of ratings | 8 | **42** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 43 MB | 27 MB |
| Requires iOS | **13.0** | 26.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [Rhythm Management, LLC](https://appshunter.io/developer/1761518402) | [Rishi Kumar](https://appshunter.io/developer/1434016052) |

## What reviewers say

### Periop Pacemaker

[App page](https://appshunter.io/ios/app/periop-pacemaker/id6615070538)

This app provides medical professionals with a decision algorithm for managing surgical patients with implantable defibrillators or pacemakers. It is based on guidelines endorsed by the Heart Rhythm Society and updated annually by an expert committee.

**Highlights:** Decision algorithm for pacemaker/defibrillator management, Endorsed by Heart Rhythm Society, Based on ASA Perioperative Cardiac Implantable Electronic Device Management Aid, Annual expert committee updates, Designed for medical professionals

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PERIOP PACEMAKER ANNUAL FEE | $2.99 | per year |
| Periop Pacemaker | $7.99 | one-time |


### VentRef

[App page](https://appshunter.io/ios/app/ventref/id6756503414)

A clinical reference tool for healthcare professionals managing mechanical ventilation and oxygen therapy. It provides information grounded in respiratory physiology and evidence-based critical care.

**Highlights:** Mechanical ventilation reference, Oxygen therapy reference, Respiratory physiology, Evidence-based critical care, Clinical decision support

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

**In-app purchases:** none


## Frequently asked questions

### Is Periop Pacemaker free?

Periop Pacemaker is free to download, with in-app purchases available.

### Is VentRef free?

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

### Which has better reviews, Periop Pacemaker or VentRef?

Periop Pacemaker and VentRef are both rated 5.0 out of 5 on the App Store, from 8 and 42 ratings respectively.

### Do Periop Pacemaker or VentRef have ads?

Neither Periop Pacemaker nor VentRef shows ads.

### Which is updated more often, Periop Pacemaker or VentRef?

Periop Pacemaker ships an update every 2 months, and VentRef every 3 weeks. Most recently, Periop Pacemaker was updated on September 9, 2026 and VentRef on September 23, 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.*