# ECHO On vs Intra

The clearest difference is price: ECHO On at Free against Intra's $3.99. ECHO On also leads on update cadence (weekly vs every 2 months) and ratings volume (15 vs 3). On rating, review sentiment, ads and in-app purchases there is nothing between them.

ECHO On is free to download; Intra costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.9 for ECHO On against 5.0 for Intra. That said, the two scores are not equally well evidenced: ECHO On has 15 ratings behind it against 3, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

ECHO On ships an update weekly, Intra every 2 months. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | ECHO On | Intra |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | [4.9 (15 ratings)](https://appshunter.io/ios/app/echo-on/id1519707786/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/intra-op-fluid-calculator/id6748544694/reviews)** |
| Number of ratings | **15** | 3 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Every 2 months |
| Monetization | **Free** | Paid |
| Size | 414 MB | 2 MB |
| Requires iOS | **15.6** | 18.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 12+ | 17+ |
| Developer | [Robert Arrigo](https://appshunter.io/developer/1519707788) | [Tyler Interrante](https://appshunter.io/developer/1821552598) |

## What reviewers say

### ECHO On

[App page](https://appshunter.io/ios/app/echo-on/id1519707786)

This medical education app helps users learn Transesophageal Echocardiography with a question bank, cognitive aid, case log, and reference library. It provides guidance on performing and interpreting a standard 28-view exam, including anatomy, function, and Doppler interrogations.

**Highlights:** Transesophageal Echocardiography education, Enlarging question bank, Rescue TEE cognitive aid, Case Log system, Perioperative Quick Reference library, Offline echo loops, Pathology, technique, and normal loop examples

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

**In-app purchases:** none


### Intra

[App page](https://appshunter.io/ios/app/intra-op-fluid-calculator/id6748544694)

This medical app assists anesthesia providers in quickly calculating intraoperative fluid requirements. It generates hour-by-hour fluid administration recommendations based on patient weight, NPO time, and surgery complexity, referencing established medical guidelines.

**Highlights:** Weight-based maintenance fluid calculation, Preoperative NPO deficit calculation, Intraoperative fluid loss adjustment, Hour-by-hour fluid administration table and chart, Consultation with practicing Anesthesiologists, References to medical guidelines

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ECHO On free?

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

### Is Intra free?

Intra costs $3.99, with no in-app purchases.

### Which has better reviews, ECHO On or Intra?

Intra is rated higher. ECHO On averages 4.9 out of 5 from 15 ratings, while Intra averages 5.0 from 3 ratings.

### Do ECHO On or Intra have ads?

Neither ECHO On nor Intra shows ads.

### Which is updated more often, ECHO On or Intra?

ECHO On ships an update weekly, and Intra every 2 months. Most recently, ECHO On was updated on November 3, 2026 and Intra on October 30, 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.*