# iTIVA Anesthesia Plus vs onsound

The clearest difference is in-app purchases: onsound at none against iTIVA Anesthesia Plus's 2. onsound also leads on update cadence (every 3 weeks vs every 2 months). iTIVA Anesthesia Plus's advantage is iOS requirement (11.0 vs 17). On price, ads and device support there is nothing between them.

Both are free to download. iTIVA Anesthesia Plus sells 2 in-app purchases, starting at $9.99 per year. onsound asks for nothing beyond the download.

iTIVA Anesthesia Plus ships an update every 2 months, onsound every 3 weeks. The most recent releases landed on November 14, 2026 and November 13, 2026 respectively.

## The numbers

| Metric | iTIVA Anesthesia Plus | onsound |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (349 ratings)](https://appshunter.io/ios/app/itiva-anesthesia-plus/id1442975682/reviews)** | — |
| Number of ratings | **349** | — |
| Positive reviews | 72.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Subscription | — |
| Size | 125 MB | 357 MB |
| Requires iOS | **11.0** | 17 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 17+ |
| Developer | [ANESTESIARTE CALI SAS](https://appshunter.io/developer/782878902) | [On Medical Group LLC](https://appshunter.io/developer/1872252756) |

## What reviewers say

### iTIVA Anesthesia Plus

[App page](https://appshunter.io/ios/app/itiva-anesthesia-plus/id1442975682)

This app simulates drug concentrations in plasma and optimizes infusion schemes for medical professionals. It offers a comprehensive drug library, target-controlled infusion simulation, and MAC age calculation. Users can explore drug interactions, share cases, and export data.

**Highlights:** Accurate drug concentration estimation, Target Controlled Infusion (TCI) simulation, Comprehensive drug library (28 drugs), Explore drug interactions (70 PK, 10 PD models), MAC Age Calculation, Intraoperative milestones & case sharing, Save and run multiple simulations, Excel data export

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| iTIVA yearly | $9.99 | per year |
| iTIVA yearly 2021 | $9.99 | per year |


### onsound

[App page](https://appshunter.io/ios/app/onsound/id6758320383)

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

**In-app purchases:** none


## Frequently asked questions

### Is iTIVA Anesthesia Plus free?

iTIVA Anesthesia Plus is free to download, with in-app purchases available.

### Is onsound free?

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

### Do iTIVA Anesthesia Plus or onsound have ads?

Neither iTIVA Anesthesia Plus nor onsound shows ads.

### Which is updated more often, iTIVA Anesthesia Plus or onsound?

iTIVA Anesthesia Plus ships an update every 2 months, and onsound every 3 weeks. Most recently, iTIVA Anesthesia Plus was updated on November 14, 2026 and onsound on November 13, 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.*