# iTIVA Anesthesia Plus vs On

The clearest difference is in-app purchases: On at none against iTIVA Anesthesia Plus's 2. On also leads on update cadence (every 6 days vs every 2 months). iTIVA Anesthesia Plus's advantage is device support (3 vs 1) and iOS requirement (11.0 vs 26.0). On price and ads there is nothing between them.

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

iTIVA Anesthesia Plus ships an update every 2 months, On every 6 days. The most recent releases landed on October 24, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | iTIVA Anesthesia Plus | On |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (342 ratings)](https://appshunter.io/ios/app/itiva-anesthesia-plus/id1442975682/reviews)** | — |
| Number of ratings | **342** | — |
| Positive reviews | 72.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 days** |
| Monetization | Subscription | — |
| Size | 125 MB | 14 MB |
| Requires iOS | **11.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [ANESTESIARTE CALI SAS](https://appshunter.io/developer/782878902) | [Cesar Mejia Valero](https://appshunter.io/developer/1506871861) |

## 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 |


### On

[App page](https://appshunter.io/ios/app/on-call-schedule-lite/id6468896281)

**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 On free?

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

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

Neither iTIVA Anesthesia Plus nor On shows ads.

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

iTIVA Anesthesia Plus ships an update every 2 months, and On every 6 days. Most recently, iTIVA Anesthesia Plus was updated on October 24, 2026 and On on September 28, 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.*