Comparison

Open vs Sick Watch

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

Head to head
About

Open

Features
Read full description

Open-OH: supporting you on your journey with Long Covid, Fibromyalgia, ME/CFS and more. Track your symptoms, and engage with resources to help you increase your functional capacity and make informed decisions about your condition and occupation DIARIES Track your activity levels, sleep, meals, symptoms and more ASSESSMENTS Access industry standard, condition specific Patient Reported Outcome Measures (PROMs) RESOURCES Receive personalised suggestions to access lots of support resources to educate and guide you on your journey with your long term conditions. Including symptoms specific resources, financial guides, and advice for your manager or employer. FIND SUPPORT Find local services to support your journey

About

Sick Watch

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Know you're getting sick before you feel it. Sick Watch monitors your overnight health signals โ€“ heart rate, HRV, temperature, and breathing โ€“ to spot the patterns that appear 1-3 days before illness symptoms. Based on research from Stanford and UCSF involving 63,000 participants, multi-signal detection can identify illness brewing with 82% accuracy, nearly 3 days before you'd normally notice. How it works: - Wear your Apple Watch to sleep - If you have existing sleep data, predictions start immediately - New watch owners get early predictions after 7 nights, full confidence at 14 - Get alerted when signals suggest your body is fighting something - Take action early โ€“ rest up, clear your schedule, boost your defences Features: - Four-signal monitoring (temperature, HRV, heart rate, respiratory rate) - Personal baseline (not population averages) - Automatic alerts when something's brewing - No iPhone required โ€“ runs entirely on Apple Watch - Privacy-first โ€“ all data stays on your device Requirements: - Apple Watch Series 4 or later - watchOS 10 or later - Series 8+ recommended for temperature monitoring One-time purchase. No subscription. No ads. NOTE: Sick Watch is not a medical device and does not provide medical diagnoses. It is intended for general wellness purposes only. Always consult a doctor before making any medical decisions.

Screenshots

Open4 screens

Verdict

The call

The clearest difference is update cadence: Sick Watch at every 4 days against Open's every 2 weeks. Sick Watch also leads on iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

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

UpkeepUpdate frequency

Open ships an update every 2 weeks, Sick Watch every 4 days. The most recent releases landed on October 27, 2026 and October 2, 2026 respectively.

Scorecard2 real differences ยท 4 level
Open versus Sick Watch: the parameters behind the verdict, then further details
ParameterOpenSick Watch
PriceFreeFree
Update frequencyEvery 2 weeksEvery 4 days โ€” better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPodiPhone, iPod, Apple Watch
Requires iOS15.013.0 โ€” better
Further details โ€” not scored
Size30 MB1 MB
Age rating4+4+
DeveloperElarosEdward Scotcher

In-app purchases

None

Open

No in-app purchases

None

Sick Watch

No in-app purchases

Questions

Is Open free?
Open is free to download, with no in-app purchases.
Is Sick Watch free?
Sick Watch is free to download, with no in-app purchases.
Do Open or Sick Watch have ads?
Neither Open nor Sick Watch shows ads.
Which is updated more often, Open or Sick Watch?
Open ships an update every 2 weeks, and Sick Watch every 4 days. Most recently, Open was updated on October 27, 2026 and Sick Watch on October 2, 2026.

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