Cernidia
Understand your sleep, recovery and daily energy
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Cernidia is a free iPhone app for making sense of sleep, recovery and daily energy estimates. Connect Apple Health or WHOOP, add how you feel, and use that context to decide when to rest, move or focus. Personal comparisons need enough history, and missing data stays unknown. Health summaries stay on your devices. No Cernidia account, ads or subscription.
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PH · launched Oct 16, 2026 · 1 upvote (top 67%)
- Healthcare
- Analytics & BI
- B2C
- Not AI
- Commercial product
- Health & Fitness
Similar launches
See all 167 similar launches →Could you build this?
Partial The UI and HealthKit/WHOOP integrations are vibe-codeable, but meaningful sleep, recovery, and energy estimates need a validated scoring model and enough personal history to be credible.
What it would actually take: The core stack is a native iOS app (Swift/SwiftUI) with HealthKit and WHOOP OAuth/API integrations and local or cloud storage. The hard part is the recovery and energy scoring algorithm, which should be calibrated against physiological data and ideally validated with studies. That requires sports science or sleep research expertise and a sizable dataset to tune baselines.
Competitors
Other products that read as similar to this one : 167 launches clear the similarity bar, closest 8 shown.
Attention rank: #76 of 168 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 256 days after the earliest competitor.
- KeepEatClean · ph · 2026-10-16 · 1 upvotes · similarity 0.47
- Healia · ph · 2026-09-22 · 1 upvotes · similarity 0.47
- RestUp · ph · 2026-09-13 · 2 upvotes · similarity 0.46
- Cairn · ph · 2026-10-14 · 1 upvotes · similarity 0.45
- KaterZerro – Alcohol Tracker & Insights · ph · 2026-10-23 · 2 upvotes · similarity 0.45
- Sleep Diary · ph · 2026-09-16 · 1 upvotes · similarity 0.45
- Narelia · ph · 2026-10-06 · 2 upvotes · similarity 0.44
- Rano · ph · 2026-09-30 · 2 upvotes · similarity 0.44
Other launches for this product
- No other launches for this product.