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RHRSpark
Your resting heart rate. Raw. Beautiful. On your wrist.
RHRSpark is a transparent resting heart rate app for Apple Watch that displays sedentary HR and Apple's daily RHR as live sparkline complications. Ten watch face complications. No scores, no interpretation. $2.99 one-time Pro unlock. No subscription. From the maker of HRVSpark.
Hey 👋 I'm Joel, solo dev behind RHRSpark (and its sister app HRVSpark).
After launching HRVSpark — which puts raw HRV data on your watch face — the most common
request was: "Can you do the same thing for resting heart rate?"
The problem is that "resting heart rate" means different things in different apps. Apple gives
you a single daily number. Other apps calculate their own version. None of them explain
what data went in or what was excluded.
RHRSpark takes a different approach: two data sources, fully transparent.
For short-term (8H/24H), it uses only heart rate samples that Apple specifically labeled as
"sedentary" — bucketed into 5-minute intervals. When there's no qualifying data, you see
a gap, not a guess.
For long-term (7D/30D), it displays Apple's own daily resting heart rate directly.
No transformation, no reinterpretation.
You always know exactly what you're looking at. That's the whole point.
$2.99 one-time Pro unlock. No subscription. No account.
I'd love to hear:
- Do you track your resting heart rate? What do you currently use?
- Is the two-source transparency useful or confusing?
- Which time window matters most to you?
About RHRSpark on Product Hunt
“Your resting heart rate. Raw. Beautiful. On your wrist.”
RHRSpark was submitted on Product Hunt and earned 3 upvotes and 1 comments, placing #65 on the daily leaderboard. RHRSpark is a transparent resting heart rate app for Apple Watch that displays sedentary HR and Apple's daily RHR as live sparkline complications. Ten watch face complications. No scores, no interpretation. $2.99 one-time Pro unlock. No subscription. From the maker of HRVSpark.
On the analytics side, RHRSpark competes within Apple Watch, Health & Fitness and Quantified Self — topics that collectively have 91.3k followers on Product Hunt. The dashboard above tracks how RHRSpark performed against the three products that launched closest to it on the same day.
Who hunted RHRSpark?
RHRSpark was hunted by Joel Farthing. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of RHRSpark including community comment highlights and product details, visit the product overview.
Joel Farthing