# EP Calipers vs The narnar app

The clearest difference is review sentiment: EP Calipers at 50% against The narnar app's 0%. EP Calipers also leads on chart position (#109 vs unranked). The narnar app's advantage is price (Free vs $1.99) and rating (4.8 vs 2.3). On ratings volume, update cadence, ads and in-app purchases there is nothing between them.

The narnar app is free to download; EP Calipers costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

The narnar app holds the better App Store score, 4.8 against 2.3. Both are backed by a comparable volume of ratings — 6 and 8 respectively. Written reviews complicate that: 50% of EP Calipers's written reviews are positive against 0% of The narnar app's, so the app with the better star average is not the one people write more warmly about.

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on November 11, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | EP Calipers | The narnar app |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | [2.3 (6 ratings)](https://appshunter.io/ios/app/ep-calipers/id982313078/reviews) | **[4.8 (8 ratings)](https://appshunter.io/ios/app/the-narnar-app/id1338238999/reviews)** |
| Number of ratings | 6 | **8** |
| Positive reviews | **50.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | Paid | **Free** |
| Best chart rank | **#109** | — |
| Size | 14 MB | 13 MB |
| Requires iOS | 17.6 | **14.3** |
| Devices | **iPhone, iPad** | iPad |
| Age rating | 12+ | 12+ |
| Developer | [EP Studios](https://appshunter.io/developer/574231798) | [narnar, LLC](https://appshunter.io/developer/1058713005) |

## What reviewers say

### EP Calipers

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

**Currently charting:** #109 Top Paid · Medical (US App Store)

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


### The narnar app

[App page](https://appshunter.io/ios/app/the-narnar-app/id1338238999)

This application aids researchers in processing and quantifying perfusion studies for contrast-enhanced ultrasound. It supports various organs and research protocols, offering real-time analysis of microvascular blood flow.

**Highlights:** Perfusion study processing, Quantification of microvascular blood flow, Supports various organs and research protocols, Automatic and manual image alignment, Real-time time-videointensity curve analysis, Parametric imaging of blood flow

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is EP Calipers free?

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

### Is The narnar app free?

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

### Which has better reviews, EP Calipers or The narnar app?

The narnar app is rated higher. EP Calipers averages 2.3 out of 5 from 6 ratings, while The narnar app averages 4.8 from 8 ratings.

### Do EP Calipers or The narnar app have ads?

Neither EP Calipers nor The narnar app shows ads.

### Which is updated more often, EP Calipers or The narnar app?

EP Calipers ships an update every 3 months, and The narnar app every 3 months. Most recently, EP Calipers was updated on November 11, 2026 and The narnar app on November 2, 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.*