Sleep that actually improves your healthspan.
Privacy-first sleep tracking built on the 1.5M-participant meta-analysis on optimal sleep duration. No accounts, no servers, no data leaves your phone.
7hr
Optimal duration
1.5M
Subjects in cited research
0
Servers · Local-only
The Problem
Why sleep tracker apps mostly fail at longevity
Most sleep apps optimize for the wrong thing. They’re chasing better-feeling sleep, not longer-living sleep. Those are different goals.
The longevity research on sleep is remarkably specific: a U-shaped mortality curve with the minimum at exactly 7 hours per night. Both significantly less and significantly more increase risk. Quality matters independently of duration. Sleep apnea is dramatically underdiagnosed. None of this shows up in apps designed primarily to tell you whether you slept ‘well’ last night. Longevity Axis: Sleep tracks the metrics that the mortality literature actually identifies — and tells you when your patterns are drifting in a dangerous direction.
Features
What the app actually tracks
Sleep Quality Score
0-100 score combining duration, consistency, awakenings, and recovery markers. Updated daily.
U-Curve Duration
Tracks against the 7-hour optimal, with explicit warnings when you’re chronically over or under.
Consistency Tracking
Same bed and wake times anchor your circadian rhythm — the most powerful single variable you control.
Apnea Screening
Built-in STOP-BANG-derived screening flags potential sleep apnea — the biggest underdiagnosed killer.
Suite Cross-Data
Shares with Hydration and Movement apps. Last night’s hydration predicts tonight’s sleep score.
Weekly Summary
Pro: weekly recovery report with trend analysis and personalized recommendations.
The Science
Built on peer-reviewed research
Every scoring decision in Longevity Axis: Sleep is backed by published cohort studies or meta-analyses. Here’s the foundation:
The 7-hour optimal
Multiple meta-analyses converge on a precise finding: all-cause mortality is minimized at 7 hours of sleep per night. Both 5 hours (RR 1.04) and 9 hours (RR 1.21) increase risk. At the extremes — 4 hours or 10+ hours — risk increases substantially.
Source
Cappuccio FP et al. (2010) Sleep. Meta-analysis of 16 prospective studies, n=1,382,999.
Quality independent of duration
The Pittsburgh Sleep Quality Index correlates with mortality independently of total sleep time. Fragmented sleep with poor sleep efficiency carries hazard ratios in the 1.10-1.20 range even when duration is adequate.
Source
Multiple meta-analyses; PSQI validated in clinical and population samples.
Sleep apnea — the underdiagnosed killer
Untreated obstructive sleep apnea carries an HR of 1.5-2.0 for all-cause mortality. An estimated 80%+ of moderate-to-severe cases go undiagnosed.
Source
Marshall NS et al. (2014) Sleep; Punjabi NM et al. (2009) PLoS Medicine.
Pricing
Free to start. Pro when ready.
FREE FOREVER
$0
Daily tracking, core scoring algorithm, suite cross-data sharing, all-time history. No account required, no data leaves your device.
PRO · 7-DAY FREE TRIAL
$4.99/mo
Or $34.99/year (save 42%). Full insight engine, cross-app correlations, weekly summaries, advanced trends, premium features.
Frequently Asked
Common questions
Do I need to wear a tracker for the app to work?
How is this different from Sleep Cycle, Pillow, or other sleep apps?
Is my sleep data private?
What's in the Pro tier?
The Suite
Pairs with the rest of the suite
Longevity Axis: Sleep works alone, but the real magic happens when paired with the other modules. Each app shares data locally to surface insights none can produce alone.
Get started
Be first when Sleep launches.
Drop your email. We’ll only message you when the app is available — no other newsletter or promotion.