# Immunity Science vs Pet Compass

The clearest difference is in-app purchases: Immunity Science at none against Pet Compass's 3. Pet Compass's advantage is update cadence (every 10 days vs every 14 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Pet Compass sells 3 in-app purchases, starting at $2.99 per 7 days. Immunity Science asks for nothing beyond the download.

Immunity Science ships an update every 14 months, Pet Compass every 10 days. The most recent releases landed on September 15, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Immunity Science | Pet Compass |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 10 days** |
| Size | 32 MB | 121 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Immunity Science, Inc.](https://appshunter.io/developer/1672160767) | [Miguel Hernandez](https://appshunter.io/developer/1518487458) |

## What reviewers say

### Immunity Science

[App page](https://appshunter.io/ios/app/immunity-science/id1672160765)

**Features:** macOS Compatibility

**In-app purchases:** none


### Pet Compass

[App page](https://appshunter.io/ios/app/pet-compass/id6757321643)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pet Compass Pro - Weekly | $2.99 | per 7 days |
| Pet Compass Pro - Monthly | $9.99 | per month |
| Pet Compass Pro - Yearly | $59.99 | per year |


## Frequently asked questions

### Is Immunity Science free?

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

### Is Pet Compass free?

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

### Do Immunity Science or Pet Compass have ads?

Neither Immunity Science nor Pet Compass shows ads.

### Which is updated more often, Immunity Science or Pet Compass?

Immunity Science ships an update every 14 months, and Pet Compass every 10 days. Most recently, Immunity Science was updated on September 15, 2026 and Pet Compass on September 19, 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.*