# EP Calipers vs iPacemaker Device

The clearest difference is price: iPacemaker Device at Free against EP Calipers's $1.99. iPacemaker Device also leads on rating (4.7 vs 2.3) and update cadence (every 4 days vs every 3 months). EP Calipers's advantage is in-app purchases (none vs 7) and review sentiment (50% vs 28%). On ads and device support there is nothing between them.

iPacemaker Device is free to download; EP Calipers costs $1.99 up front. iPacemaker Device sells 7 in-app purchases, starting at $9.99 per month. EP Calipers asks for nothing beyond the download.

iPacemaker Device holds the better App Store score, 4.7 against 2.3. That said, the two scores are not equally well evidenced: iPacemaker Device has 365 ratings behind it against 6, so its average is the more settled of the two. Written reviews complicate that: 50% of EP Calipers's written reviews are positive against 28% of iPacemaker Device's, so the app with the better star average is not the one people write more warmly about.

EP Calipers ships an update every 3 months, iPacemaker Device every 4 days. The most recent releases landed on October 1, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | EP Calipers | iPacemaker Device |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | [2.3 (6 ratings)](https://appshunter.io/ios/app/ep-calipers/id982313078/reviews) | **[4.7 (365 ratings)](https://appshunter.io/ios/app/ipacemaker-device/id1126088055/reviews)** |
| Number of ratings | 6 | **365** |
| Positive reviews | **50.0% of reviews** | 27.9% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 4 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Best chart rank | — | **#48** |
| Size | 9 MB | 218 MB |
| Requires iOS | **14.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [EP Studios](https://appshunter.io/developer/574231798) | [IPACEMAKER S.R.L.](https://appshunter.io/developer/1780219062) |

## What reviewers say

### EP Calipers

[App page](https://appshunter.io/ios/app/ep-calipers/id982313078)

This medical app allows users to measure intervals and angles on electrocardiogram (ECG) images. It's designed for healthcare professionals to accurately analyze ECGs from photos or PDFs, aiding in calculations like heart rate and QT intervals.

**Highlights:** Measure ECG intervals, Measure ECG angles, Calculate mean heart rate, Determine corrected QT interval, Analyze ECG photos and PDFs, Supports Brugada syndrome beta angle measurement

**Features:** Vision Pro support

**In-app purchases:** none


### iPacemaker Device

[App page](https://appshunter.io/ios/app/ipacemaker-device/id1126088055)

**Currently charting:** #48 Top Grossing · Medical (US App Store)

Access a vast database of implantable cardiac devices, including pacemakers and defibrillators. Get detailed technical specifications, connector information, advisories, and MRI compatibility checks. Compare devices and explore algorithms to aid in selection and management.

**Highlights:** Extensive device database, Detailed technical datasheets, Connector and tool information, Advisories and safety warnings, Multibrand MRI compatibility evaluation, Algorithm descriptions, Side-by-side device comparison

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 month subscription REGULAR | $9.99 | per month |
| 3 Months Subscription | $49.99 | per 3 months |
| 12 months subscription REGULAR | $49.99 | per year |
| 6 Months Subscription | $59.99 | per 6 months |
| 12 Months Subscription | $99.99 | per year |
| 12 months subscription PREMIUM | $109.99 | per year |
| 12 months subscription PREMIUM | $109.99 | per year |

**What reviewers like**

- 👍 Great resource for cardiac rhythm devices
- 👍 App is useful for professionals
- 👍 Some users find it helpful
- 👍 Support team helped some users

**What reviewers complain about**

- 💸 Prohibitively expensive
- 💸 Price increase is steep
- 💸 So expensive for no reason
- 💸 Creator got greedy
- 💸 Subscription fees are ridiculous

**Reported bugs**

- App keeps refreshing, cannot open
- App cannot be opened
- App enters interface and stops, cannot open
- App has not worked for years
- App hasn't worked for days

**Requested features**

- More equitable evaluation of company representation
- Fix app hanging/slow opening
- Update for newer devices
- Grandfather in lifetime members
- Refund original charge for lifetime members


## Frequently asked questions

### Is EP Calipers free?

EP Calipers costs $1.99, with no in-app purchases.

### Is iPacemaker Device free?

iPacemaker Device is free to download, with in-app purchases available.

### Which has better reviews, EP Calipers or iPacemaker Device?

iPacemaker Device is rated higher. EP Calipers averages 2.3 out of 5 from 6 ratings, while iPacemaker Device averages 4.7 from 365 ratings.

### Do EP Calipers or iPacemaker Device have ads?

Neither EP Calipers nor iPacemaker Device shows ads.

### Which is updated more often, EP Calipers or iPacemaker Device?

EP Calipers ships an update every 3 months, and iPacemaker Device every 4 days. Most recently, EP Calipers was updated on October 1, 2026 and iPacemaker Device on October 14, 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.*