Comparison

Chill vs PrimalOS

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Chill

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
Read full description

Cold plunging asks you to be present. Our Chill - Cold Plunge Timer App takes care of the timing so you can focus on the moment. Choose your duration, set the temperature, settle into guided box breathing, and keep a private record of the sessions you complete. TIME YOUR PLUNGE Choose a session length from 1 to 59 minutes and select the water temperature for accurate record keeping. Watch the large countdown, hear a gentle chime every 30 seconds while Chill is on screen, and turn on Audio Countdown for spoken time updates and the final 10-second countdown. With notifications enabled, Chill can alert you when your timer completes. BREATHE WITH GUIDANCE Follow the on-screen box breathing animation during your session. You can turn the animation or spoken countdown on or off in Settings. LOOK BACK See completed sessions in your iPhone history, including time in the water and the temperature you selected. Time a plunge on Apple Watch and have it appear in your iPhone history when the devices connect. Watch-face complications can show your plunge count. MAKE IT YOURS WITH CHILL+ The timer, guided breathing, basic history, and Apple Watch timer are free. Chill+ is a one-time purchase that adds: • Month and year activity grids • Streaks and consecutive-day goals • Plunge reminders on the days you choose • Private notes about each session • Activity-grid Home Screen widgets • Streak and goal views on Apple Watch PRIVATE BY DESIGN Your sessions and notes are stored locally on your devices. Chill has no account, sign-up, ads, or tracking, and it does not upload your records to a developer server. Device backups are controlled by your Apple settings. Chill is a timing and journaling tool, not a medical or safety device. Cold water immersion has risks; seek medical advice if you have concerns, and never rely on a timer or alert as your only safety measure.

About

PrimalOS

Features
Read full description

Primal Plunges – Transform Your Recovery Routine Discover the smarter way to cold plunge. With Primal Plunges, you get a full wellness system that blends cutting-edge technology with guided sessions to enhance mood, sleep, resilience and performance. What you’ll get: Access to immersive video-guided cold plunge sessions with breathwork, coaching, and scenic visuals. Real time tracking and progress monitoring to help make routine cold immersion a sustainable habit. Remote control of temperature and settings via WiFi-enabled app so you can adjust from your device. Built-in support for full wellness rituals — combining cold, breath, meditation, and focus. Why it works: Our premium plunge systems deliver deep temperature drop, rapid recovery and clean water with high-quality filtration and sanitation. Paired with our apps and guided sessions, you can turn each session into a ritual rather than a chore. Who it’s for: Whether you’re an athlete seeking enhanced recovery, a busy professional looking for mental clarity, or simply someone ready to invest in better sleep and resilience — this app and system is built for you. Get started: Download the app, pair it with your Primal Plunges tub, follow a guided session, log your progress, and elevate your recovery game. Note: This app is designed to integrate with Primal Plunges hardware. Features may vary depending on the model and subscription status. Take the plunge. Elevate your ritual.

Screenshots

Chill4 screens
PrimalOS4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

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.

Scorecard2 real differences · 7 level
Chill versus PrimalOS: the parameters behind the verdict, then further details
ParameterChillPrimalOS
PriceFreeFree
Rating5.0 (2 ratings) — better—
Number of ratings2 — better—
Update frequencyEvery 4 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, Apple WatchiPhone, iPod, Apple Watch — better
Requires iOS17.015.6 — better
Further details — not scored
Size6 MB106 MB
Age rating4+4+
DeveloperAnda BlanduO'Neill Development LLC

In-app purchases

None

Chill

No in-app purchases

None

PrimalOS

No in-app purchases

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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