# iRhythm Random vs Centro Ottava

The clearest difference is price: Centro Ottava at Free against iRhythm Random's $6.99. Centro Ottava also leads on update cadence (daily vs every 10 days) and iOS requirement (15.6 vs 17.0). On ads, in-app purchases and device support there is nothing between them.

Centro Ottava is free to download; iRhythm Random costs $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

iRhythm Random ships an update every 10 days, Centro Ottava daily. The most recent releases landed on October 11, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | iRhythm Random | Centro Ottava |
| --- | --- | --- |
| Price | $6.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 days | **Daily** |
| Size | 300 MB | 0 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Maurizio Salvi](https://appshunter.io/developer/1736599893) | [Pietro Paolo Levato](https://appshunter.io/developer/1807104193) |

## What reviewers say

### iRhythm Random

[App page](https://appshunter.io/ios/app/irhythm-random/id6479618009)

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

**In-app purchases:** none


### Centro Ottava

[App page](https://appshunter.io/ios/app/centro-ottava/id6744328332)

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

**In-app purchases:** none


## Frequently asked questions

### Is iRhythm Random free?

iRhythm Random costs $6.99, with no in-app purchases.

### Is Centro Ottava free?

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

### Do iRhythm Random or Centro Ottava have ads?

Neither iRhythm Random nor Centro Ottava shows ads.

### Which is updated more often, iRhythm Random or Centro Ottava?

iRhythm Random ships an update every 10 days, and Centro Ottava daily. Most recently, iRhythm Random was updated on October 11, 2026 and Centro Ottava on October 8, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*