Comparison

Gripwise vs Sleep Ledger

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

Head to head
About

Gripwise

Features
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60% of the elderly persons above 65 years of age, suffer from some degree of the Frailty Syndrome. The Frailty Syndrome is considered as “The holy grail of geriatric medicine” (WHO – Clinical Consortium on Healthy Ageing - 2016). From this information, it is apparent that Frailty screening, diagnosis and treatment are of major relevance, more so, because Frailty is potentially modifiable with adequate and opportune simple interventions. Gripwise is a Smart Dynamometer that provides simplicity of use, fast and accurate assessment of strength and this APP is it's interface. With this App you can create the profile of your clients, including their anamnesis, setup the workflow for several types of assessments. With Gripwise solution it's possible to track the progress of frailty in a simple and effective way. The information provided by Gripwise application is not intended or implied to be a substitute for professional medical advice, diagnosis or treatment.

About

Sleep Ledger

This app analyzes your sleep data from Apple Health to calculate your sleep debt and provides a personalized daily plan to help you recover. It offers insights into sleep quality and a clear path to reaching your sleep goals.

Highlights
  • Sleep debt calculation
  • Personalized recovery plan
  • Quality-weighted sleep score
  • Calendar-based schedule
  • Lock screen widgets
  • On-device processing
  • Siri Shortcuts
Features
Read full description

Are you running on a sleep deficit? Sleep Ledger reads your Apple Health sleep data to calculate how much sleep you owe your body — and builds a personalized, day-by-day recovery plan to help you pay it back. WHAT MAKES SLEEP LEDGER DIFFERENT Unlike other sleep apps that drown you in data, Sleep Ledger gives you two things: a number (your sleep debt) and a plan (when to go to bed tonight). - Quality-Weighted Debt Score Not just hours — Sleep Ledger uses Apple Watch sleep stage data (Deep, REM, Core) to calculate how effective your sleep really was. Six hours of deep, restorative sleep counts differently than eight hours of restless tossing. - Calendar Recovery Plan See exactly when you'll be debt-free. Sleep Ledger generates a day-by-day schedule with recommended bedtimes, adjustable for late nights and per-weekday wake times. - Lock Screen, Home Screen & Apple Watch Complications Your debt balance and tonight's bedtime — always one glance away on your lock screen, home screen, or watch face, without opening the app. - Private by Design, On-Device Processing No account creation. No analytics SDKs. No advertising code. No third-party trackers. Your sleep, heart rate, and HRV data is processed entirely on your device. The only network request happens when you choose to send us feedback from Settings → Contact, and the diagnostic details are shown in the form before you send them. HOW IT WORKS 1. Download and grant read access to Apple Health sleep data. 2. Sleep Ledger analyzes your past 14 days of sleep history. 3. See your current sleep debt balance instantly. 4. Follow your personalized recovery plan to reach zero debt. FEATURES Free: - Sleep debt calculation (14-day rolling window) - Recommended bedtime based on your wake time and current debt - Manual sleep entry (add, edit, delete nights) - Lock Screen widgets (debt balance & recovery gauge) - Home Screen widget, Small (debt balance + days to zero) - Apple Watch complications (circular gauge, rectangular, corner) - Bedtime reminder and morning summary notifications - Siri Shortcuts (check debt, get bedtime, last night summary) - Works with or without Apple Watch (enhanced with Watch) - English, Japanese, German, French, and Korean Premium: - 14-day debt trend charts - Day-by-day recovery plan with target zero-debt date - Quality-weighted debt score (sleep stages + HRV) - Sleep stage breakdown (Deep / Core / REM stacked chart) - Home Screen widget, Medium (debt · last night · bedtime) - CSV data export (date, duration, stages, HR/HRV) ABOUT SLEEP DEBT Sleep debt is the gap between the sleep your body needs and the sleep you actually get. Research shows that accumulated sleep debt affects energy, mood, focus, and long-term health. The good news: you can pay it back. Sleep Ledger shows you how. PRICING Sleep Ledger is free to download. Core features — today's debt balance, tonight's bedtime recommendation, manual sleep entry, Lock Screen widgets, Apple Watch complications, and Small Home Screen widget — are always free. Premium unlocks the full recovery plan, sleep trend history, quality-weighted scoring, sleep stage breakdown, Home Screen Medium widget, and CSV data export. Annual plan includes a 2-week free trial. PRIVACY Sleep Ledger contains zero analytics SDKs, zero advertising code, and zero third-party trackers. Your sleep, heart rate, and HRV data is processed entirely on your device — it never leaves your iPhone. The only network request is triggered when you tap Settings → Contact to send feedback, and the full diagnostic payload (iOS version, device model, app version, HealthKit fetch status, Premium status) is visible in the form before you send it. We believe your health data belongs to you and only you. Note: Sleep Ledger is a general wellness app. It is not a medical device and is not intended to diagnose, treat, or prevent any disease. Consult a healthcare professional for medical concerns.

Screenshots

Gripwise4 screens
Sleep Ledger4 screens

Verdict

The call

The clearest difference is in-app purchases: Gripwise at none against Sleep Ledger's 3. Gripwise also leads on iOS requirement (12.0 vs 18.0). Sleep Ledger's advantage is update cadence (weekly vs every 4 weeks). On price, 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

Both are free to download. Sleep Ledger sells 3 in-app purchases, starting at $4.99 per month. Gripwise asks for nothing beyond the download.

UpkeepUpdate frequency

Gripwise ships an update every 4 weeks, Sleep Ledger weekly. The most recent releases landed on May 16, 2026 and September 21, 2026 respectively.

Scorecard3 real differences · 6 level
Gripwise versus Sleep Ledger: the parameters behind the verdict, then further details
ParameterGripwiseSleep Ledger
PriceFreeFree
Rating5.0 (2 ratings) — better
Number of ratings2 — better
Update frequencyEvery 4 weeksWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFreemium
DevicesiPhone, iPodiPhone, Apple Watch
Requires iOS12.0 — better18.0
Further details — not scored
Size38 MB7 MB
Age rating4+12+
DeveloperGRIPWISE TECH, LDATakumi Kanzaki

In-app purchases

None

Gripwise

No in-app purchases

3 purchases

Sleep Ledger

Subscriptions2
  • Monthly$4.991 Month
  • Annual14 Days trial$29.991 Year
One-time1
  • Lifetime$79.99

Questions

Is Gripwise free?
Gripwise is free to download, with no in-app purchases.
Is Sleep Ledger free?
Sleep Ledger is free to download, with in-app purchases available.
Do Gripwise or Sleep Ledger have ads?
Neither Gripwise nor Sleep Ledger shows ads.
Which is updated more often, Gripwise or Sleep Ledger?
Gripwise ships an update every 4 weeks, and Sleep Ledger weekly. Most recently, Gripwise was updated on May 16, 2026 and Sleep Ledger on September 21, 2026.

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