Comparison

OxyKnight vs The Self

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

Head to head
About

OxyKnight

This app works with compatible smart oximeter devices to monitor and record overnight pulse oximetry. It provides detailed sleep reports with SpO2 and PR trends, customizable alarms, and spot-checking capabilities for oxygen saturation and respiration rate.

Highlights
  • Overnight HRPO monitoring
  • Sleep reports with SpO2/PR trends
  • Customizable SpO2/PR alarms
  • Spot Check SpO2, PR, Respiration Rate
  • Bluetooth device connection
  • Shareable sleep data
Features
Read full description

The updated OxyKnight® App is now compatible with multiple CMI Health smart oximeters including the OxyKnight® Watch, the OxyKnight® Watch Lite, and the OxyKnight® Finger. The OxyKnight® Watch and Watch Lite are perfect for anyone who snores, who feels not fully rested after sleep, has sleep disorders or oxygen issues, or people who may need to be monitored during sleep. They are very comfortable to wear and operate continuously throughout the night. It’s made with a soft, flexible fingertip cup and adjustable wrist strap for simple use. Just 1 tap within the App to connect the Watch with the OxyKnight® App via Bluetooth. The OxyKnight® Finger is a clinical-grade smart fingertip oximeter designed for home use, sports, and aviation. Check your oxygen saturation anytime, anywhere, and sync results effortlessly with the OxyKnight® App. FEATURES (Need the compatible and designated OxyKnight® device for the specific functionality) - Monitors and records HRPO (High-Resolution Pulse Oximetry) overnight - Sleep report includes SpO2 and PR trend graph, and a series of statistics. Easy to share with family members or doctors. - Trend data for sleep quality, SpO2, and PR - Customizable SpO2 and PR alarms - Spot Check SpO2, PR, and Respiration Rate Disclaimer: Please always seek a doctor’s advice before making any medical decisions.

About

The Self

Features
Read full description

Dare to take care of yourself — for real this time. The Self-Care Dare is a 5-week challenge that builds 25 wellness habits, one dare at a time. Based on the book by Carrie Cox, each weekday unlocks one new dare across the five factors of lasting wellness: Mindset, Nutrition, Fitness, Sleep, and Connection. HOW IT WORKS • One new dare every weekday — 25 total over 5 weeks • Habits stack: yesterday's dares stay active while new ones arrive • Check off each dare daily and watch your score climb toward a perfect 1,000 STAY MOTIVATED • 2x points for perfect days, bonuses for perfect weeks and streaks • 16 badges to earn along the way • Daily journal with an AI coach that responds to what you actually wrote • Morning reminders that match each day's dare BETTER TOGETHER • Create a team, share the invite code, and climb the leaderboard with friends • Cheer each other on in your team feed HAVE THE BOOK? Scan the QR code inside The Self-Care Dare book to unlock 6 weeks of premium access — free. Free tier includes daily dare tracking and your personal score. Premium ($2.99/week after 7-day free trial) unlocks full dare coaching, the guided journal, teams, and community. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://theselfcaredare.com/privacy

Screenshots

OxyKnight4 screens
The Self4 screens

Verdict

The call

The clearest difference is in-app purchases: OxyKnight at none against The Self's 1. OxyKnight also leads on update cadence (fortnightly vs monthly) and iOS requirement (13.0 vs 15.1). On price, ads 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. The Self sells 1 in-app purchase, starting at $2.99 per 7 days. OxyKnight asks for nothing beyond the download.

UpkeepUpdate frequency

OxyKnight ships an update fortnightly, The Self monthly. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

Scorecard3 real differences · 7 level
OxyKnight versus The Self: the parameters behind the verdict, then further details
ParameterOxyKnightThe Self
PriceFreeFree
Rating4.0 (12 ratings) — better—
Positive reviews50.0% of reviews—
Number of ratings12 — better—
Update frequencyFortnightly — betterMonthly
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPodiPhone, iPod
Requires iOS13.0 — better15.1
Further details — not scored
Size48 MB32 MB
Age rating4+12+
DeveloperCMI Health Inc.Crew Fitness, LLC

In-app purchases

None

OxyKnight

No in-app purchases

1 purchases

The Self

Subscriptions1
  • Self-Care Dare Premium7 Days trial$2.997 Days

Questions

Is OxyKnight free?
OxyKnight is free to download, with no in-app purchases.
Is The Self free?
The Self is free to download, with in-app purchases available.
Do OxyKnight or The Self have ads?
Neither OxyKnight nor The Self shows ads.
Which is updated more often, OxyKnight or The Self?
OxyKnight ships an update fortnightly, and The Self monthly. Most recently, OxyKnight was updated on November 3, 2026 and The Self on October 31, 2026.

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