# Viz.ai vs NIH Stroke Scale Calculator

The clearest difference is rating: NIH Stroke Scale Calculator at 5.0 against Viz.ai's 4.2. NIH Stroke Scale Calculator also leads on iOS requirement (15.4 vs 17.0). Viz.ai's advantage is update cadence (fortnightly vs every 4 months) and ratings volume (36 vs 4). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

NIH Stroke Scale Calculator holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: Viz.ai has 36 ratings behind it against 4, so its average is the more settled of the two.

Viz.ai ships an update fortnightly, NIH Stroke Scale Calculator every 4 months. The most recent releases landed on September 16, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Viz.ai | NIH Stroke Scale Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.2 (36 ratings)](https://appshunter.io/ios/app/vizai/id1222399372/reviews) | **[5.0 (4 ratings)](https://appshunter.io/ios/app/nih-stroke-scale-calculator/id6443905481/reviews)** |
| Number of ratings | **36** | 4 |
| Positive reviews | 14.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 4 months |
| Monetization | Free | Free |
| Size | 56 MB | 2 MB |
| Requires iOS | 17.0 | **15.4** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 12+ | 17+ |
| Developer | [Viz.ai, Inc.](https://appshunter.io/developer/1222399371) | [US Department of Veterans Affairs (VA)](https://appshunter.io/developer/430646305) |

## What reviewers say

### Viz.ai

[App page](https://appshunter.io/ios/app/vizai/id1222399372)

This AI-powered telehealth platform assists clinicians in detecting critical diseases like stroke through advanced imaging analysis. It automates workflows and provides mobile imaging with HIPAA-compliant messaging to synchronize care across specialties.

**Highlights:** AI-powered disease detection, Automated CT perfusion imaging, Mobile imaging capabilities, HIPAA-compliant messaging, Synchronized clinical workflows, Remote installation

**Features:** macOS Compatibility

**In-app purchases:** none


### NIH Stroke Scale Calculator

[App page](https://appshunter.io/ios/app/nih-stroke-scale-calculator/id6443905481)

This tool helps healthcare professionals quickly assess a patient's neurologic condition for stroke-like symptoms. Its user-friendly interface streamlines the diagnosis process, saving critical time during emergencies.

**Highlights:** Quick neurologic assessment, Stroke symptom evaluation, Intuitive user interface, Faster diagnosis, Severity determination

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Viz.ai free?

Viz.ai is free to download, with no in-app purchases.

### Is NIH Stroke Scale Calculator free?

NIH Stroke Scale Calculator is free to download, with no in-app purchases.

### Which has better reviews, Viz.ai or NIH Stroke Scale Calculator?

NIH Stroke Scale Calculator is rated higher. Viz.ai averages 4.2 out of 5 from 36 ratings, while NIH Stroke Scale Calculator averages 5.0 from 4 ratings.

### Do Viz.ai or NIH Stroke Scale Calculator have ads?

Neither Viz.ai nor NIH Stroke Scale Calculator shows ads.

### Which is updated more often, Viz.ai or NIH Stroke Scale Calculator?

Viz.ai ships an update fortnightly, and NIH Stroke Scale Calculator every 4 months. Most recently, Viz.ai was updated on September 16, 2026 and NIH Stroke Scale Calculator on September 20, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*