Comparison

Shadow Yoga vs RHRSpark

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

Head to head
About

Shadow Yoga

Learn the Shadow Yoga Preludes with animated demonstrations of Caranas and all three sequences. This app provides instructions to deepen your understanding of the practice, complementing in-person guidance from certified teachers.

Highlights
  • Animated Caranas
  • All three Preludes demonstrated
  • Instructional support
  • Complements teacher instruction
  • Supports understanding of practice
Features
Read full description

The Shadow Yoga app is an aid designed to help in learning the Shadow Yoga Preludes. The app contains animations of the Caranas and all three Preludes. Instructions are also included that will support the student’s understanding of the practice. This app is intended to complement direct instruction from one of the teachers qualified to teach this subject listed on the Shadow yoga website. www.shadowyoga.com

About

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.

Highlights
  • 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
Features
Read full description

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

Shadow Yoga4 screens
RHRSpark4 screens

Verdict

The call

The clearest difference is price: RHRSpark at Free against Shadow Yoga's $4.99. RHRSpark also leads on update cadence (weekly vs every 11 months). Shadow Yoga's advantage is in-app purchases (none vs 2) and iOS requirement (12.0 vs 17.0). On rating, ratings volume, 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

CostPrice · In-app purchases · Ads · Monetization

RHRSpark is free to download; Shadow Yoga costs $4.99 up front. RHRSpark sells 2 one-off in-app purchases. Shadow Yoga 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 Shadow Yoga against 5.0 for RHRSpark. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

UpkeepUpdate frequency

Shadow Yoga ships an update every 11 months, RHRSpark weekly. The most recent releases landed on November 1, 2026 and October 31, 2026 respectively.

Scorecard5 real differences · 5 level
Shadow Yoga versus RHRSpark: the parameters behind the verdict, then further details
ParameterShadow YogaRHRSpark
Price$4.99Free — better
Rating5.0 (1 ratings)5.0 (1 ratings)
Positive reviews100.0% of reviews—
Number of ratings11
Update frequencyEvery 11 monthsWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPodiPhone, iPad, Apple Watch
Requires iOS12.0 — better17.0
Further details — not scored
Size21 MB6 MB
Age rating4+4+
DeveloperShadow YogaJoel Farthing

Customer experience

Shadow Yoga

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

RHRSpark

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Shadow Yoga

No in-app purchases

2 purchases

RHRSpark

One-time2
  • RHRSpark Pro$0.99
  • Tip Jar$2.99

Questions

Is Shadow Yoga free?
Shadow Yoga costs $4.99, with no in-app purchases.
Is RHRSpark free?
RHRSpark is free to download, with in-app purchases available.
Which has better reviews, Shadow Yoga or RHRSpark?
Shadow Yoga and RHRSpark are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.
Do Shadow Yoga or RHRSpark have ads?
Neither Shadow Yoga nor RHRSpark shows ads.
Which is updated more often, Shadow Yoga or RHRSpark?
Shadow Yoga ships an update every 11 months, and RHRSpark weekly. Most recently, Shadow Yoga was updated on November 1, 2026 and RHRSpark on October 31, 2026.

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