# On vs Sterling Vascular

The clearest difference is iOS requirement: Sterling Vascular at 16.4 against On's 26.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

On ships an update every 6 days, Sterling Vascular every 9 days. The most recent releases landed on October 25, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | On | Sterling Vascular |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 days** | Every 9 days |
| Size | 14 MB | 32 MB |
| Requires iOS | 26.0 | **16.4** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 17+ |
| Developer | [Cesar Mejia Valero](https://appshunter.io/developer/1506871861) | [Sloane Sterling](https://appshunter.io/developer/6805969478) |

## What reviewers say

### On

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

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

**In-app purchases:** none


### Sterling Vascular

[App page](https://appshunter.io/ios/app/sterling-vascular/id6805969476)

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

**In-app purchases:** none


## Frequently asked questions

### Is On free?

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

### Is Sterling Vascular free?

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

### Do On or Sterling Vascular have ads?

Neither On nor Sterling Vascular shows ads.

### Which is updated more often, On or Sterling Vascular?

On ships an update every 6 days, and Sterling Vascular every 9 days. Most recently, On was updated on October 25, 2026 and Sterling Vascular on October 29, 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.*