Comparison

C19 vs Pacing

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

Head to head
About

C19

This NHS-approved application allows clinical teams and universities to manage patient conditions remotely, conduct research, and access support resources. Public-facing versions offer optional subscription services for enhanced features.

Highlights
  • Remote condition management
  • Clinical service integration
  • University research participation
  • Public-facing applications
  • Optional subscription services
  • Health and wellbeing resources
Features
Read full description

Download and get started with the NHS-approved C19-YRS app, as featured on BBC News. The C19-YRS app can be configured by clinical teams as part of a clinical service, by Universities for research, or used independently through our public-facing applications. Our clinical version of the app is intended for patients registered at a clinical service which has invited them to download the app to manage their condition remotely, complete assessments, and access support resources to improve their health and wellbeing, according to the individual service’s purpose. The app may also be used for research studies who register participants onto the app to take part in projects. If you are using the app as part of a service or project, a member of staff will provide users with their login details or instructions on how to sign up for the app. Please contact a member of staff at your service or project team for support if you get stuck. We have two public facing apps as of 2025: 1 Autonom-e+ in collaboration with University of Leeds. This is free to register and comes with an optional subscription service. 2 The ME Clinical Assessment Toolkit in collaboration with ME Association. This is free to register and comes with an optional subscription service. Auto-renewable subscription options for our public apps: 1 month (Β£2.99) duration 1 year (Β£19.99) duration Your subscription will be charged to your Apple App Store account at confirmation of purchase and will automatically renew (at the duration selected) unless auto-renew is turned off at least 24 hours before the end of the current period Current subscriptions may not be cancelled during the active subscription period; however, you can manage your subscription and/or turn off auto-renewal by visiting your App Store Account Settings after purchase. Privacy Policy: https://c19-yrs.com/legal/privacy-policy End User Licence Agreement: https://c19-yrs.com/legal/end-user-licence-agreement/

About

Pacing

This app helps individuals with ME/CFS manage their activity levels by monitoring heart rate against personalized thresholds. It provides visual cues and alerts to prevent overexertion and potential relapses, integrating with Apple Health for comprehensive tracking.

Highlights
  • Activity management for ME/CFS
  • Personalized heart rate thresholds
  • Relapse prevention alerts
  • Visual heart rate zone indicators
  • Apple Health integration
  • Apple Watch exclusive
Features
Read full description

Pacing is an activity management strategy to help ME/CFS patients limit the number and severity of relapses while remaining as active as possible. For ME/CFS patient-pacing purposes the heart rate threshold is set at a percentage of the peak heart rate. The app uses the formula (220 - age) * 0.55. The app also considers the average resting heartbeat of the last 14 days. A heartbeat above 15 beats of the average resting heartbeat is also considered as too much. This app can give you clues, but it does not replace taking care of yourself and taking it easy if needed. The app is for the Apple Watch only and will not be displayed on the iPhone. Press the Digital Crown on the Apple Watch to go to the Home screen. There you will find the app. We use the following rules: Heart rate is greater than the average resting pulse + 15 in the last 14 days: red circle 100% filled and a soft click. Heart rate is smaller (220 - age) * 0.36: light, green circle 16% full Heart rate is smaller (220 - age) * 0.38: medium, green circle 32% full Heart rate is smaller (220 - age) * 0.40: hard, yellow circle 48% full Heart rate is smaller (220 - age) * 0.45: very hard, yellow circle filled to 64%, soft clicking Heart rate is smaller (220 - age) * 0. 55: cautious, yellow circle filled to 80%, soft clicking Heart rate is larger: red circle filled to 100% and a short warning tone Pacing integrates with the Apple Health app. Disclaimer: The app was developed in consultation with physicians who treat ME/CFS patients. However, the App does not provide medical advice or endorse any treatment or medical procedure. The information contained in the App is not intended to be a substitute for professional medical advice, diagnosis or treatment. Your reliance on any information provided by the App is entirely at your own risk.

Screenshots

C194 screens

Verdict

The call

The clearest difference is in-app purchases: Pacing at none against C19's 5. Pacing also leads on update cadence (every 4 days vs every 9 days). C19's advantage is review sentiment (25% vs 0%). On price, ads, device support and iOS requirement there is nothing between them.

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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. C19 sells 5 in-app purchases, starting at $2.99 per month. Pacing asks for nothing beyond the download.

UpkeepUpdate frequency

C19 ships an update every 9 days, Pacing every 4 days. The most recent releases landed on September 18, 2026 and September 29, 2026 respectively.

Scorecard4 real differences Β· 4 level
C19 versus Pacing: the parameters behind the verdict, then further details
ParameterC19Pacing
PriceFreeFree
Positive reviews25.0% of reviews β€” better0.0% of reviews
Update frequencyEvery 9 daysEvery 4 days β€” better
AdsNoNo
In-app purchasesYesNo β€” better
MonetizationFree with in-app purchasesFree β€” better
DevicesiPhone, iPad, iPod β€” betteriPhone, Apple Watch
Requires iOS15.0 β€” better16.6
Further details β€” not scored
Size33 MB1 MB
Age rating4+4+
DeveloperElarosQ_PERIOR AG

Customer experience

C19

Written reviews4 reviews
Positive25.0%
Neutral0.0%
Negative75.0%

Pacing

Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

5 purchases

C19

Subscriptions5
  • MEA-CAT Self Reporting$2.991 Month
  • C19-YRS Self Reporting$2.991 Month
  • Self-Reporting Subscription$2.991 Year
Show 2 more
  • MEA-CAT Self Reporting$19.991 Year
  • C19-YRS Self Reporting$19.991 Year
None

Pacing

No in-app purchases

Questions

Is C19 free?
C19 is free to download, with in-app purchases available.
Is Pacing free?
Pacing is free to download, with no in-app purchases.
Do C19 or Pacing have ads?
Neither C19 nor Pacing shows ads.
Which is updated more often, C19 or Pacing?
C19 ships an update every 9 days, and Pacing every 4 days. Most recently, C19 was updated on September 18, 2026 and Pacing on September 29, 2026.

Other comparisons