# Chill vs PrimalOS

The clearest difference is update cadence: PrimalOS at every 2 weeks against Chill's every 4 months. PrimalOS also leads on iOS requirement (15.6 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

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

Chill ships an update every 4 months, PrimalOS every 2 weeks. The most recent releases landed on October 1, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Chill | PrimalOS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/chill-cold-plunge-timer/id6449394827/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 6 MB | 106 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | iPhone, Apple Watch | **iPhone, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [Anda Blandu](https://appshunter.io/developer/1688883018) | [O'Neill Development LLC](https://appshunter.io/developer/1855551360) |

## What reviewers say

### Chill

[App page](https://appshunter.io/ios/app/chill-cold-plunge-timer/id6449394827)

This app is a dedicated companion for cold plunge sessions, offering precision timing, guided breathing exercises, and rhythmic chimes to enhance your cold immersion experience. It helps optimize your practice for physical recovery, mental clarity, and energy boosts.

**Highlights:** Customizable session durations, Guided box breathing exercise, 30-second interval chimes, 10-second final countdown, Enhances cold immersion benefits

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


### PrimalOS

[App page](https://appshunter.io/ios/app/primalos/id6745167385)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Chill free?

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

### Is PrimalOS free?

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

### Do Chill or PrimalOS have ads?

Neither Chill nor PrimalOS shows ads.

### Which is updated more often, Chill or PrimalOS?

Chill ships an update every 4 months, and PrimalOS every 2 weeks. Most recently, Chill was updated on October 1, 2026 and PrimalOS on October 5, 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.*