Raynaud vs HRVSpark
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Real-time attack logging
- Retrospective attack reporting
- Daily RCS diary completion
- Customizable notification reminders
- Attack tracking for Raynaud's symptoms
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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.
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.
- 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
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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
Verdict
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
Both are free to download. HRVSpark sells 2 one-off in-app purchases. Raynaud asks for nothing beyond the download.
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.
Raynaud ships an update every 5 months, HRVSpark weekly. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.
| Parameter | Raynaud | HRVSpark |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) | 5.0 (2 ratings) |
| Positive reviews | 0.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 1 | 2 — better |
| Update frequency | Every 5 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone, iPad | iPhone, iPad, Apple Watch — better |
| Requires iOS | 16.4 — better | 17.0 |
| Further details — not scored | ||
| Size | 24 MB | 6 MB |
| Age rating | 12+ | 4+ |
| Developer | Bambang Parmanto | Joel Farthing |
Customer experience
Raynaud
HRVSpark
In-app purchases
Raynaud
No in-app purchases
HRVSpark
- HRVSpark Pro$0.99
- HRVSpark Tip Jar$4.99








