# CAIRIBU vs APS Physiology

CAIRIBU and APS Physiology are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

CAIRIBU ships an update every 3 weeks, APS Physiology every 2 weeks. The most recent releases landed on September 10, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | CAIRIBU | APS Physiology |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Size | 39 MB | 87 MB |
| Requires iOS | **15.1** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Edison Chiu](https://appshunter.io/developer/1816660479) | [American Physiological Society](https://appshunter.io/developer/1674934435) |

## What reviewers say

### CAIRIBU

[App page](https://appshunter.io/ios/app/cairibu/id6746400454)

**Features:** macOS Compatibility

**In-app purchases:** none


### APS Physiology

[App page](https://appshunter.io/ios/app/aps-physiology/id6759407893)

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

**In-app purchases:** none


## Frequently asked questions

### Is CAIRIBU free?

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

### Is APS Physiology free?

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

### Do CAIRIBU or APS Physiology have ads?

Neither CAIRIBU nor APS Physiology shows ads.

### Which is updated more often, CAIRIBU or APS Physiology?

CAIRIBU ships an update every 3 weeks, and APS Physiology every 2 weeks. Most recently, CAIRIBU was updated on September 10, 2026 and APS Physiology on September 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.*