Ledger
14-night ledger
Every night is a row — duration, delta, source. Deposits above the line, withdrawals below. Calendar gaps show as dashed rows, not silently vanished data.
Coming soon to iOS
A piggy bank for your sleep debt.
Short nights withdraw. Good nights deposit. Pennie totals your 14-night balance from Apple Health and walks you through a quiet Sunday ritual to repay.
HealthKit-native · On-device only · Not a medical device
−4h 32m
Typical week — a little in the red
Pennie
That was a good one. Let's bank it.
The idea
A bank statement for your sleep.
The app tracks a rolling 14-night balance. Under the hood it runs the Borbély two-process model and Van Dongen's sleep-debt math — the same science that frames cognitive debt as a two-week rolling window. On the surface it's just Pennie, a gauge, and a ledger.
Patterns, not predictions. Warmth, not guilt. The goal is to make catching up feel like a deposit, not an obligation.
What's inside
Everything a quiet sleep tracker should be.
Forecast
Typical-dip heatmap
A 7-day × 24-hour view of where your energy historically dips. Built from your last 28 days. Pattern-language only — never a ‘you will crash’ claim.
Ritual
The Sunday ritual
Five quiet steps every Sunday. Review the week, pick a pace, let Pennie file the bedtimes into your calendar. Becomes the anchor of a healthier rhythm.
Advice
Tonight's tune-up
One to three small nudges a day — ‘tonight, aim for 8h 30m,’ ‘Thursdays tend to be rough,’ ‘skip the nap today.’ Dismiss any card; it won't re-ask for three days.
Edge states
Warmth when it's hard
Five days of deep debt aren't met with a red alert. Pennie gets quieter, offers a gentler plan, and respects a snooze button. The app knows when to step back.
Share
Weekly statement, reel-worthy
Tap the gauge on Sunday and you get a five-second vertical clip of your week — balance, best night, typical dip, Pennie's line. Strava-grade restraint. No branded loudness.
Bonus
A glance at your wrist
The Apple Watch app and complication keep the balance one wrist-flick away. Optional — the iPhone app is the home for the full ledger and the Sunday ritual.
Privacy
Your sleep stays on your phone.
No cloud sync. No server copy. Analytics is strictly opt-in and only ever carries event names — never numbers. If you uninstall the app, every night goes with it.
Read the privacy page →- ✓Reads sleep from Apple Health on your device.
- ✓No CloudKit sync (App Store §5.1.3 compliant).
- ✓Crash reports scrub any sleep-related values before send.
- ✓Analytics defaults off. You turn it on if you want.
- ✓HealthKit access revokable anytime from iOS Settings.
Pricing
A small monthly, or one payment, forever.
Free tier shows the last three nights and the hero balance. The rest unlocks with a trial.
Monthly
$6.99/month
3-day free trial
Good for testing the full experience. Auto-renews.
Yearly
$59/year
7-day free trial
Best value — saves roughly 30% over monthly.
Lifetime
$79 · one time
Launch-window only
One payment. Yours forever. No auto-renew.
Subscriptions auto-renew unless cancelled 24h before period end. See Terms for the full disclosure. Manage anytime in your Apple ID settings.
Your sleep, in the black.
Get notified
We'll ping you the day it ships.
No feed. No follow-ups. One email with the App Store link when Nightpenny lands on iOS.
Email hello@foxtaming.com
Or bookmark this page. Launch announcement goes here first.