Rest Window vs Sippy
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Rest Window
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Rest Window — sleep timing for real schedules. If your work schedule doesn't look like 9-to-5, neither should your sleep app. Rest Window is built for the people whose lives run around the clock: nurses, doctors, EMTs, firefighters, dispatchers, pilots, transit operators, on-call engineers, new parents, students cramming for exams, and travelers crossing time zones. Five focused calculators help you plan sleep around the day you actually have. SHIFT WORKER For rotating, night, and on-call schedules. Enter your shift start time and Rest Window walks you backward — when to wind down, when to climb in bed, when you'll actually fall asleep, and when to wake. Built for the realities of swing shifts and split sleep. NAP PLANNER Power naps (20 min), full-cycle naps (90 min), or recovery naps (3 hr) — choose by sleep mode or by the time you need to be ready. For nurses between shifts, parents catching minutes when the baby's down, and students pacing study breaks. SLEEP CYCLES The classic question: "If I go to bed now, when should I wake up?" Rest Window calculates wake times at full 90-minute cycle boundaries, so you're rising between cycles instead of mid-deep-sleep. Includes fall-asleep buffer and wake buffer adjustments. JET LAG PLANNER Crossing time zones for work or family? Plan your sleep schedule in advance with eastbound and westbound adjustments. Reduce the wreckage of long-haul flights and irregular international travel. NO ALARM MODE For the rare day you don't need to be anywhere — a weekend, PTO, or a recovery day after a brutal stretch. Pick your sleep start time and see when you'd naturally wake at each cycle boundary. Wake at a biological boundary, not a buzzer. WHY REST WINDOW • Built for real schedules — not just 10 PM to 6 AM • No accounts, no tracking, no data collection • Sleep schedules stay on your device, not on our servers • Works offline once installed • Clean, calm interface designed for tired eyes • Copy any result to share with a partner, manager, or your own notes • How-to videos at YouTube.com/@timingsleep WHO THIS APP IS FOR Healthcare workers · First responders · Shift-based essential workers · New parents · Students · Frequent travelers · Anyone whose body is fighting their schedule Rest Window won't make your schedule normal. It will help you find the best sleep inside the schedule you actually have.
Sippy
This app calculates your personalized daily water intake goal based on your body, activity, and environment. It offers an engaging interface with visual feedback and customizable reminders to make hydration effortless and rewarding.
- Personalized daily water goal calculation
- Immersive "glass of water" home screen
- One-tap logging
- Adaptive and customizable reminders
- Streaks, badges, and goal celebrations
- Offline functionality
- Smart goal adjustment for weather
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Sippy figures out how much water YOU actually need — from your body, activity, climate and life stage — instead of the generic "8 glasses for everyone." Then it makes drinking water feel effortless and rewarding. WHY SIPPY • Personalized daily goal, calculated from your body and day (not a one-size rule) • Immersive "glass of water" home screen that fills as you drink, with 3D ice • One-tap logging: Sip, Glass or a custom amount • Adaptive reminders you fully control — frequency, quiet hours and days • Streaks, badges and a goal-completion celebration • Works offline; syncs across devices when you sign in SIPPY PRO • Smart goal that adjusts to today's weather • Advanced insights: trends, best times, records and a consistency score • Beverage weighting — count coffee, tea, juice and more • Premium challenges • Full color themes Sippy offers wellness guidance only and is not medical advice. If you have kidney, heart or pregnancy concerns, follow your doctor's guidance. SIPPY PRO SUBSCRIPTION Sippy Pro is an optional auto-renewable subscription: • Sippy Pro Monthly — $2.99 per month • Sippy Pro Yearly — $19.99 per year Payment is charged to your Apple ID account at confirmation of purchase. The subscription automatically renews unless it is cancelled at least 24 hours before the end of the current period. Your account is charged for renewal within 24 hours prior to the end of the current period. Manage or cancel your subscription anytime in your App Store account settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://hydroflow-42u.pages.dev/privacy.html
Screenshots
Verdict
The clearest difference is in-app purchases: Rest Window at none against Sippy's 2. On price, ads, device support and iOS requirement 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
Both are free to download. Sippy sells 2 in-app purchases, starting at $2.99 per month. Rest Window asks for nothing beyond the download.
| Parameter | Rest Window | Sippy |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | — | Weekly |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Freemium |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 3 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | FAYSHON PATRICE BROWN | Nasid Sameer |
In-app purchases
Rest Window
No in-app purchases
Sippy
- Sippy Pro$2.991 Month
- Sippy Pro Yearly$19.991 Year









