# Instrumentor vs STS Risk Calc

The clearest difference is update cadence: Instrumentor at every 3 days against STS Risk Calc's every 16 months. Instrumentor also leads on iOS requirement (13.0 vs 15.1). On price, rating, ratings volume and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for Instrumentor against 5.0 for STS Risk Calc. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Instrumentor ships an update every 3 days, STS Risk Calc every 16 months. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Instrumentor | STS Risk Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/instrumentor/id6466037539/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/sts-risk-calc/id6737915787/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 16 months |
| Monetization | Free | Free |
| Size | 21 MB | 35 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Instrumentor Solutions Inc.](https://appshunter.io/developer/1706840493) | [The Society of Thoracic Surgeons](https://appshunter.io/developer/580753468) |

## What reviewers say

### Instrumentor

[App page](https://appshunter.io/ios/app/instrumentor/id6466037539)

This platform enables surgeons and medical professionals to manage and collaborate on surgical cases. It offers effortless video management and seamless connection with a professional network for feedback and insights.

**Highlights:** HIPAA-compliant collaboration, Effortless case video management, Access and search surgical cases, Seamless professional network connection, Share cases and provide feedback, Virtual voice assistant integration

**Features:** macOS Compatibility

**In-app purchases:** none


### STS Risk Calc

[App page](https://appshunter.io/ios/app/sts-risk-calc/id6737915787)

This tool assists cardiothoracic surgery teams in evaluating patient surgical risk. It utilizes current data from a national database to provide accurate risk assessments.

**Highlights:** Surgical risk assessment, Utilizes STS National Database data, For cardiothoracic surgery teams, Free to use

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

**In-app purchases:** none


## Frequently asked questions

### Is Instrumentor free?

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

### Is STS Risk Calc free?

STS Risk Calc is free to download, with no in-app purchases.

### Which has better reviews, Instrumentor or STS Risk Calc?

Instrumentor and STS Risk Calc are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do Instrumentor or STS Risk Calc have ads?

Neither Instrumentor nor STS Risk Calc shows ads.

### Which is updated more often, Instrumentor or STS Risk Calc?

Instrumentor ships an update every 3 days, and STS Risk Calc every 16 months. Most recently, Instrumentor was updated on November 3, 2026 and STS Risk Calc 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.*