Comparison

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.

Head to head
About

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.

Highlights
  • Optimal wake-up time recommendations
  • Sleep cycle analysis
  • Reduces grogginess
  • Promotes alertness
  • Free to use
Features
Read full description

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.

About

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.

Highlights
  • 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
Features
Read full description

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

Sleep Time Calculator4 screens
Sleep Calculator Plus3 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
Sleep Time Calculator versus Sleep Calculator Plus: the parameters behind the verdict, then further details
ParameterSleep Time CalculatorSleep Calculator Plus
PriceFreeFree
Rating3.8 (23 ratings)4.8 (32 ratings) — better
Positive reviews69.7% of reviews100.0% of reviews — better
Number of ratings2332 — better
Update frequencyEvery 3 monthsDaily — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS8.0 — better16.6
Further details — not scored
Size55 MB1 MB
Age rating12+4+
DeveloperRecked Software LLCKevin Hausen

Customer experience

Sleep Time Calculator

All ratings22 ratings
Positive68.2%
Neutral4.5%
Negative27.3%
Written reviews33 reviews
Positive69.7%
Neutral0.0%
Negative30.3%

Sleep Calculator Plus

All ratings32 ratings
Positive96.9%
Neutral0.0%
Negative3.1%
Written reviews2 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Sleep Time Calculator

No in-app purchases

None

Sleep Calculator Plus

No in-app purchases

Questions

Is Sleep Time Calculator free?
Sleep Time Calculator is free to download, with no in-app purchases.
Is Sleep Calculator Plus free?
Sleep Calculator Plus is free to download, with no in-app purchases.
Which has better reviews, Sleep Time Calculator or Sleep Calculator Plus?
Sleep Calculator Plus is rated higher. Sleep Time Calculator averages 3.8 out of 5 from 23 ratings, while Sleep Calculator Plus averages 4.8 from 32 ratings.
Do Sleep Time Calculator or Sleep Calculator Plus have ads?
Neither Sleep Time Calculator nor Sleep Calculator Plus shows ads.
Which is updated more often, Sleep Time Calculator or Sleep Calculator Plus?
Sleep Time Calculator ships an update every 3 months, and Sleep Calculator Plus daily. Most recently, Sleep Time Calculator was updated on November 1, 2026 and Sleep Calculator Plus on November 8, 2026.

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