# Observe. vs CardioAlign

The clearest difference is in-app purchases: Observe. at none against CardioAlign's 4. Observe. also leads on iOS requirement (13.0 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. CardioAlign sells 4 in-app purchases, starting at $4.99 per month. Observe. asks for nothing beyond the download.

## The numbers

| Metric | Observe. | CardioAlign |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | — |
| Size | 29 MB | 292 MB |
| Requires iOS | **13.0** | 18.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [SELECT ICT Systems SAE](https://appshunter.io/developer/1780577476) | [Kenneth Guber, M.D. LLC](https://appshunter.io/developer/1860110576) |

## What reviewers say

### Observe.

[App page](https://appshunter.io/ios/app/observe/id6738393422)

**In-app purchases:** none


### CardioAlign

[App page](https://appshunter.io/ios/app/cardioalign/id6757942085)

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Resident Tier | $4.99 | per month |
| Attending Tier | $14.99 | per month |
| On Call Pack | $2.99 | one-time |
| Semester Pack | $14.99 | one-time |


## Frequently asked questions

### Is Observe. free?

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

### Is CardioAlign free?

CardioAlign is free to download, with in-app purchases available.

### Do Observe. or CardioAlign have ads?

Neither Observe. nor CardioAlign shows ads.

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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.*