Flamingo Readiness vs RHRSpark
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Flamingo Readiness
Understand your health trends and recovery with a personal readiness score. This app uses your Apple Watch data to track heart rate, HRV, and sleep, providing simple charts to visualize your progress.
- Personal readiness score
- HealthKit integration
- Heart rate tracking
- Sleep analysis
- Heart Rate Variability (HRV) monitoring
- Simple trend visualization
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Flamingo Readiness. A simpler way to understand trends in your health data and improve your recovery process. Flamingo is a health and wellness app that integrates with HealthKit data to track metrics specific to your unique heart rate and sleep schedule. Using data automatically captured from the Health app by your Apple Watch device, Flamingo generates a personal readiness score every day that can help you stay informed about your mental and physical state of readiness. Readiness is calculated daily by measuring 3 health metrics: Heart Rate, Heart Rate Variability, and Sleep. Your data is never compared to an absolute scale - after all, everyone is different. Instead, each metric is compared against your average value to determine positive or negative trends that may indicate a need for rest and recovery. The greater these trends are, the more they impact your readiness score. Just wear your Apple Watch to sleep, then check Flamingo first thing when you wake up for best results. Charts are designed to be simple to understand and reconfigurable so that you don't have to sift through complicated details and rows of data. Visualize trends for individual metrics, or access historical data to understand how your readiness has changed over time and how it has been impacted by each metric. Flamingo is free to download for a limited time to gather feedback and improve the experience as much as possible. Please share any feedback you have with flamingo@toggle.llc This app was developed with SwiftUI. The information provided in this app is for informational purposes only. Flamingo is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always take into account how you feel to assess readiness and consult with a medical professional if you have any questions about your health.
RHRSpark
Visualize your resting heart rate directly on your Apple Watch face with customizable complications. Choose from various styles and time windows to see your heart rate trends at a glance. Understand how your data is calculated with full transparency.
- Resting heart rate on watch face
- Sparkline, gauge, or corner complications
- 10 watch face complications
- 4 time window options (8H, 24H, 7D, 30D)
- Two distinct data sources
- Full calculation transparency
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RHRSpark puts your resting heart rate on your Apple Watch face as a sparkline, a gauge, or a corner complication. WHAT YOU GET • Three free 24-hour complications: a sparkline, a gauge, and a corner • Seven Pro complications across 8-hour, 7-day, and 30-day windows • Recent sedentary heart rate and Apple's daily resting heart rate, each labeled • Calculation notes for every complication in the iPhone gallery TWO SOURCES, SHOWN CLEARLY The 8-hour and 24-hour views use heart-rate samples that HealthKit labels as sedentary. The 7-day and 30-day views use Apple's daily resting heart rate. When there is no recent sedentary sample, the big number shows Apple's latest resting heart rate and says so. Longer gaps stay visible instead of being filled in. BUILT FOR THE WATCH FACE Choose rectangular, circular, or corner complications. A short HR or RHR label tells you which source you are seeing and leaves the sparkline the room. The Apple Watch app works without the iPhone app and keeps a record of your daily values. The iPhone app adds older days whenever you open it. ONE-TIME PRO UNLOCK Download free and use the three 24-hour complications. Unlock all ten with a single one-time purchase. No subscription, account, ads, or telemetry. PAIR IT WITH HRVSPARK HRVSpark gives the same direct view of raw SDNN heart rate variability across useful time windows. HealthKit data stays on your devices and moves only between your iPhone and Apple Watch through Apple frameworks. RHRSpark may request a small configuration file from filamentlabs.io to show current product messages. That request contains no health data. RHRSpark is for informational purposes only. It does not provide medical advice or diagnose, treat, cure, or prevent any medical condition.
Screenshots
Verdict
The clearest difference is in-app purchases: Flamingo Readiness at none against RHRSpark's 2. Flamingo Readiness also leads on ratings volume (7 vs 1) and iOS requirement (15.0 vs 17.0). RHRSpark's advantage is update cadence (weekly vs every 5 months). On price, rating, 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
Both are free to download. RHRSpark sells 2 one-off in-app purchases. Flamingo Readiness asks for nothing beyond the download.
On the App Store both sit at effectively the same score — 5.0 for Flamingo Readiness against 5.0 for RHRSpark. That said, the two scores are not equally well evidenced: Flamingo Readiness has 7 ratings behind it against 1, so its average is the more settled of the two.
Flamingo Readiness ships an update every 5 months, RHRSpark weekly. The most recent releases landed on October 12, 2026 and October 24, 2026 respectively.
| Parameter | Flamingo Readiness | RHRSpark |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (7 ratings) | 5.0 (1 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 7 — better | 1 |
| Update frequency | Every 5 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPod | iPhone, iPad, Apple Watch — better |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 3 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | Gianluca Capraro | Joel Farthing |
Customer experience
Flamingo Readiness
RHRSpark
In-app purchases
Flamingo Readiness
No in-app purchases
RHRSpark
- RHRSpark Pro$0.99
- Tip Jar$2.99









