ECHO On vs Intra
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ECHO On
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.
- 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
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ECHO On is a free medical education resource for learning Transesophageal Echocardiography including a free, enlarging question bank, a Rescue TEE cognitive aid, a Case Log system for submission to the NBE, and a growing perioperative Quick Reference library with offline echo loops that work even in the OR without internet access, and includes pathology examples, techniques, and normal loops of the heart. ECHO On will walk you through an entire standard 28 view exam teaching you the anatomy, function and Doppler interrogations you should perform at each view, and how to interpret them. ECHO On is and will remain free, and the best way you can contribute is to submit boards-style questions or echo stills and echo loops to help grow the QBank, Quick Reference and Pathology libraries. Disclaimer: This app was written to provide an accessible perioperative tool for residents and fellows learning TEE in the cardiac OR and ICU, and for generalist anesthesiologists looking to refresh their knowledge of TEE. It is not meant for patients to self-diagnose. It is not meant to be a definitive reference. Despite my best efforts, there may be errors or inaccuracies in this app, so please do not use it for medical decision making, as doing so may lead you misdiagnose or seriously harm your patient. If you are not a qualified medical doctor, please see a qualified medical doctor before making any medical decisions, including those based on echocardiograms.
Intra
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.
- 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
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Are you an Anesthesia provider? Do you want a quick, reliable way to calculate intraoperative fluid requirements without fumbling through mental math or outdated charts? This app does just that! Using published references and case studies, we’ve built a tool that calculates weight-based maintenance fluids, preoperative NPO deficits, and allows you to adjust for intraoperative fluid losses by case complexity. Simply enter your patient’s ideal body weight, NPO time, surgery length, and desired mL/kg/hr maintenance rate — the app will generate an hour-by-hour table and chart of recommended fluid administration. This calculator was created in consultation with practicing Anesthesiologists to reflect recommended best practices and commonly used formulas. The calculations follow well-known guidelines such as the “4-2-1 rule” for maintenance and Furman et al.’s approach for NPO deficit replacement, expanded for adult patients. We continuously review published literature and local practices and will provide updates when changes are made. The purpose of this app is to serve as a general-use fluid management reference for licensed Anesthesia providers (Anesthesiologists, CRNAs, CAAs, etc.) to support intraoperative planning. It is not intended to replace formal training, institutional policies, or professional judgment. References are provided for transparency and to give users confidence in the underlying formulas. DISCLAIMER: This app is not a substitute for your clinical judgment, institutional protocols, or published guidelines. Always confirm calculations against your hospital, state, or specialty society recommendations and apply your clinical expertise to each unique patient scenario
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | ECHO On | Intra |
|---|---|---|
| Price | Free — better | $3.99 |
| Rating | 4.9 (15 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 15 — better | 3 |
| Update frequency | Weekly — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.6 — better | 18.4 |
| Further details — not scored | ||
| Size | 414 MB | 2 MB |
| Age rating | 12+ | 17+ |
| Developer | Robert Arrigo | Tyler Interrante |
Customer experience
ECHO On
Intra
In-app purchases
ECHO On
No in-app purchases
Intra
No in-app purchases









