Sleep Time Calculator vs Sleep Calculator Plus
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Sleep Time Calculator
This free utility helps you determine optimal wake-up times based on sleep cycles. It aims to reduce grogginess by recommending times to rise at the end of a sleep cycle, promoting a more alert feeling.
- Optimal wake-up time recommendations
- Sleep cycle analysis
- Reduces grogginess
- Promotes alertness
- Free to use
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Know the best possible times to wake up with this free app. The five stages of sleep, including their repetition, occur cyclically. The first cycle, which ends after the completion of the first REM stage, usually lasts for 90 minutes. With 8 hours of sleep you typically go through 4-5 cycles a night. Waking up in the middle of a cycle leaves you feeling groggy, but waking up at the end of a cycle leaves you feeling awake and alert. This app gives you recommendations on when to wake up in the morning to decrease the likelihood that you will feel groggy.
Sleep Calculator Plus
This utility helps you determine the ideal times to sleep or wake up by calculating based on natural 90-minute sleep cycles. It aims to help users feel more refreshed and energized by waking them between these cycles.
- Calculate optimal bedtime
- Find best wake-up times
- Supports 12/24 hour formats
- Intuitive interface
- Dark design for nighttime
- No ads or in-app purchases
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Sleep Calculator Plus - Find Your Perfect Sleep Time Tired of being tired? Sleep Calculator helps you find the ideal time to go to bed or wake up! Our brains move through natural 90-minute sleep cycles. Sleep Calculator helps you wake up between these cycles - so you start your day feeling refreshed and energized! KEY FEATURES: - Calculate the optimal bedtime for your desired wake-up time - Find the best wake-up times if you are going to bed now - Simple and intuitive interface - Supports both 12 and 24-hour formats - Elegant dark design for nighttime use - No ads, no in-app purchases HOW IT WORKS: Sleep Calculator Plus factors in that you need about 15 minutes to fall asleep and then calculates several ideal sleep times based on complete sleep cycles. Choose the time that best fits your daily schedule! Whether you are an early bird or a night owl - Sleep Calculator Plus helps you wake up at the right time and say goodbye to grogginess! Pro tip: Look for the "Suggested" times - these are especially recommended for a refreshing sleep! Download Sleep Calculator Plus now and discover what being well-rested really feels like!
Screenshots
Verdict
The clearest difference is rating: Sleep Calculator Plus at 4.8 against Sleep Time Calculator's 3.8. Sleep Calculator Plus also leads on review sentiment (100% vs 70%) and update cadence (daily vs every 3 months). Sleep Time Calculator's advantage is iOS requirement (8.0 vs 16.6). On price, ratings volume, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
Sleep Calculator Plus holds the better App Store score, 4.8 against 3.8. Both are backed by a comparable volume of ratings — 23 and 32 respectively. Written reviews point the same way: 70% of Sleep Time Calculator's written reviews are positive against 100% of Sleep Calculator Plus's.
Sleep Time Calculator ships an update every 3 months, Sleep Calculator Plus daily. The most recent releases landed on November 1, 2026 and November 8, 2026 respectively.
| Parameter | Sleep Time Calculator | Sleep Calculator Plus |
|---|---|---|
| Price | Free | Free |
| Rating | 3.8 (23 ratings) | 4.8 (32 ratings) — better |
| Positive reviews | 69.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 23 | 32 — better |
| Update frequency | Every 3 months | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 8.0 — better | 16.6 |
| Further details — not scored | ||
| Size | 55 MB | 1 MB |
| Age rating | 12+ | 4+ |
| Developer | Recked Software LLC | Kevin Hausen |
Customer experience
Sleep Time Calculator
Sleep Calculator Plus
In-app purchases
Sleep Time Calculator
No in-app purchases
Sleep Calculator Plus
No in-app purchases
Questions
Is Sleep Time Calculator free?
Is Sleep Calculator Plus free?
Which has better reviews, Sleep Time Calculator or Sleep Calculator Plus?
Do Sleep Time Calculator or Sleep Calculator Plus have ads?
Which is updated more often, Sleep Time Calculator or Sleep Calculator Plus?
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