# EDTNA/ERCA vs Echo Quant

The clearest difference is price: EDTNA/ERCA at Free against Echo Quant's $2.99. EDTNA/ERCA also leads on iOS requirement (15.0 vs 17.6). Echo Quant's advantage is update cadence (every 8 days vs every 2 months). On ads, in-app purchases and device support there is nothing between them.

EDTNA/ERCA is free to download; Echo Quant costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

EDTNA/ERCA ships an update every 2 months, Echo Quant every 8 days. The most recent releases landed on October 7, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | EDTNA/ERCA | Echo Quant |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/echo-quant-tte-calculator/id6792183241/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 8 days** |
| Monetization | — | Free |
| Size | 21 MB | 0 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 12+ |
| Developer | [Trilobite Technologies, s.r.o.](https://appshunter.io/developer/1106306899) | [Robert Burgese](https://appshunter.io/developer/6792183243) |

## What reviewers say

### EDTNA/ERCA

[App page](https://appshunter.io/ios/app/edtnaerca/id1531289859)

**Features:** macOS Compatibility

**In-app purchases:** none


### Echo Quant

[App page](https://appshunter.io/ios/app/echo-quant-tte-calculator/id6792183241)

This app transforms raw TTE measurements into graded, report-ready numbers for medical professionals and students. It offers guided modules for various cardiac conditions and provides referenced formulas with links to guidelines. The app works offline and prioritizes user privacy.

**Highlights:** Offline TTE measurement calculation, Graded severity meters against ASE thresholds, Report-ready output lines, Referenced formulas with guideline links, Eight guided quantification modules, Privacy-focused, no data collection

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is EDTNA/ERCA free?

EDTNA/ERCA is free to download, with no in-app purchases.

### Is Echo Quant free?

Echo Quant costs $2.99, with no in-app purchases.

### Do EDTNA/ERCA or Echo Quant have ads?

Neither EDTNA/ERCA nor Echo Quant shows ads.

### Which is updated more often, EDTNA/ERCA or Echo Quant?

EDTNA/ERCA ships an update every 2 months, and Echo Quant every 8 days. Most recently, EDTNA/ERCA was updated on October 7, 2026 and Echo Quant on October 11, 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.*