The narnar app vs Coltrain
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
The narnar app
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.
- 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
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The narnar app for contrast-enhanced ultrasound (CEUS) allows researchers to process and quantify perfusion studies of various organs (e.g., heart, kidney, liver, skeletal muscle), acquired across a range of research protocols, including cardiac realtime, cardiac triggered and generic realtime studies. Key features include: • Automatic and manual image alignment • Color-coding of digitally-subtracted images • Averaged and maximum intensity projection (MIP) imaging • Quantification and modeling of microvascular blood flow from time-videointensity curves, calculated in real-time. • Parametric imaging of blood flow and velocity
Coltrain
A secure, cloud-based messaging platform for healthcare professionals to enhance patient care and collaboration. It allows for case-based discussions and the secure sharing of photos, videos, and documents.
- HIPAA-compliant messaging
- Secure cloud-based platform
- Case-based discussions
- Photo and document sharing
- Peer-to-peer communication
- Mobile device compatibility
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Coltrain is a HIPAA-compliant, cloud-based, mobile messaging platform designed for healthcare professionals (HCPs). It incorporates secure chat and case-based discussion to enhance patient care and HCP collaboration. Securely load photos, videos, and other documents to allow seamless teamwork. Coltrain is peer-to-peer and can be used by anyone with a mobile device, regardless of location or healthcare system.
Screenshots
Verdict
The clearest difference is rating: Coltrain at 5.0 against The narnar app's 4.8. Coltrain also leads on update cadence (monthly vs every 3 months) and device support (3 vs 1). On price, ratings volume, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Coltrain holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 8 and 17 respectively.
The narnar app ships an update every 3 months, Coltrain monthly. The most recent releases landed on October 16, 2026 and October 5, 2026 respectively.
| Parameter | The narnar app | Coltrain |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (8 ratings) | 5.0 (17 ratings) — better |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 8 | 17 — better |
| Update frequency | Every 3 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 14.3 — better | 15.6 |
| Further details — not scored | ||
| Size | 13 MB | 302 MB |
| Age rating | 12+ | 17+ |
| Developer | narnar, LLC | Cognition Med, LLC |
Customer experience
The narnar app
Coltrain
In-app purchases
The narnar app
No in-app purchases
Coltrain
No in-app purchases
