# Ether vs Periop Pacemaker

The clearest difference is review sentiment: Periop Pacemaker at 100% against Ether's 40%. Periop Pacemaker also leads on iOS requirement (13.0 vs 15.6). Ether's advantage is in-app purchases (none vs 2). On price, update cadence, ads and device support there is nothing between them.

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

Ether ships an update every 6 weeks, Periop Pacemaker every 2 months. The most recent releases landed on October 3, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | Ether | Periop Pacemaker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (8 ratings)](https://appshunter.io/ios/app/periop-pacemaker/id6615070538/reviews)** |
| Number of ratings | — | **8** |
| Positive reviews | 40.0% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 4 MB | 43 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Stanford Anesthesia Informatics And Media Lab](https://appshunter.io/developer/360941478) | [Rhythm Management, LLC](https://appshunter.io/developer/1761518402) |

## What reviewers say

### Ether

[App page](https://appshunter.io/ios/app/ether/id360941475)

This medical app provides anesthesiologists with easy access to essential practice information. It offers features like telephone directories and physician contact information, with some content restricted to authenticated Stanford affiliates.

**Highlights:** Anesthesiology practice information, Stanford clinical facility directories, Physician contact information, Built-in text paging, Access for Stanford affiliates

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 |


## Frequently asked questions

### Is Ether free?

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

### Is Periop Pacemaker free?

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

### Do Ether or Periop Pacemaker have ads?

Neither Ether nor Periop Pacemaker shows ads.

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

Ether ships an update every 6 weeks, and Periop Pacemaker every 2 months. Most recently, Ether was updated on October 3, 2026 and Periop Pacemaker on September 27, 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.*