Comparison

Raynaud vs HRVSpark

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

Head to head
About

Raynaud

This app allows individuals experiencing Raynaud's symptoms to meticulously log their attacks. Users can document episodes as they happen or recall past events. It also offers a daily diary feature and customizable reminders for notifications.

Highlights
  • Real-time attack logging
  • Retrospective attack reporting
  • Daily RCS diary completion
  • Customizable notification reminders
  • Attack tracking for Raynaud's symptoms
Features
Read full description

This application helps users with Raynaud symptoms track the attacks. Users can record their attacks in real-time or retrospectively report attacks they have experienced. Additionally, users can complete the RCS diary at the end of the day and set up a reminder to receive a notification.

About

HRVSpark

Visualize your raw heart rate variability data directly on your Apple Watch face with a dynamic sparkline complication. Get immediate insights into your body's trends without opaque scores or labels. A companion iPhone app provides detailed views and guidance.

Highlights
  • Raw HRV sparkline complication
  • 8-hour free complication
  • 24/7, 7-day, 30-day Pro views
  • Circular gauge and corner complications
  • iPhone companion app
  • No interpretation layer
  • Complication-first design
Features
Read full description

HRVSpark puts your heart rate variability on your Apple Watch face as a sparkline, a gauge, or a corner complication. It shows the SDNN readings saved in Apple Health and nothing more. WHAT YOU GET • Three free 8-hour complications: a sparkline, a gauge, and a corner • Seven Pro complications across 24-hour, 7-day, and 30-day windows • Gaps left visible when your watch took no readings • An iPhone app with a live gallery of every complication and setup help JUST YOUR HRV HRVSpark shows your SDNN values across useful time windows without turning them into a readiness, stress, or recovery score. What they mean for your day is up to you. BUILT FOR THE WATCH FACE The complications are designed for quick checks on the wrist. Each gauge places a recent value between the low and high of its window. The Apple Watch app works without the iPhone app and keeps a record of your daily averages. The iPhone app adds older days whenever you open it. ONE-TIME PRO UNLOCK Download free and use the three 8-hour complications. Unlock all ten with a single one-time purchase. No subscription, account, ads, or telemetry. PAIR IT WITH RHRSPARK RHRSpark gives the same direct view of resting heart rate, with recent sedentary heart rate and Apple's daily resting heart rate. HealthKit data stays on your devices and moves only between your iPhone and Apple Watch through Apple frameworks. HRVSpark may request a small configuration file from filamentlabs.io to show current product messages. That request contains no health data. If you claim the supporter thank-you, HRVSpark sends Apple's signed record of your HRVSpark purchase to filamentlabs.io so each purchase receives one RHRSpark Pro code. That record contains no health data. HRVSpark is for informational purposes only. It does not provide medical advice or diagnose, treat, cure, or prevent any medical condition.

Screenshots

Raynaud4 screens
HRVSpark4 screens

Verdict

The call

Raynaud and HRVSpark both sit at 5.0 stars, but that hides the real split: 100% of HRVSpark's written reviews are positive against 0% of Raynaud's. HRVSpark also leads on update cadence (weekly vs every 5 months). Raynaud's advantage is in-app purchases (none vs 2). On price, rating, ratings volume and ads 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. HRVSpark sells 2 one-off in-app purchases. Raynaud asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for Raynaud against 5.0 for HRVSpark. Both are backed by a comparable volume of ratings — 1 and 2 respectively. Written reviews are what separate them: 0% of Raynaud's written reviews are positive against 100% of HRVSpark's.

UpkeepUpdate frequency

Raynaud ships an update every 5 months, HRVSpark weekly. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

Scorecard4 real differences · 6 level
Raynaud versus HRVSpark: the parameters behind the verdict, then further details
ParameterRaynaudHRVSpark
PriceFreeFree
Rating5.0 (1 ratings)5.0 (2 ratings)
Positive reviews0.0% of reviews100.0% of reviews — better
Number of ratings12 — better
Update frequencyEvery 5 monthsWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFreemium
DevicesiPhone, iPadiPhone, iPad, Apple Watch — better
Requires iOS16.4 — better17.0
Further details — not scored
Size24 MB6 MB
Age rating12+4+
DeveloperBambang ParmantoJoel Farthing

Customer experience

Raynaud

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

HRVSpark

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Raynaud

No in-app purchases

2 purchases

HRVSpark

One-time2
  • HRVSpark Pro$0.99
  • HRVSpark Tip Jar$4.99

Questions

Is Raynaud free?
Raynaud is free to download, with no in-app purchases.
Is HRVSpark free?
HRVSpark is free to download, with in-app purchases available.
Which has better reviews, Raynaud or HRVSpark?
Raynaud and HRVSpark are both rated 5.0 out of 5 on the App Store, from 1 and 2 ratings respectively.
Do Raynaud or HRVSpark have ads?
Neither Raynaud nor HRVSpark shows ads.
Which is updated more often, Raynaud or HRVSpark?
Raynaud ships an update every 5 months, and HRVSpark weekly. Most recently, Raynaud was updated on November 2, 2026 and HRVSpark on October 31, 2026.

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