Dev tools · alternatives · 2026

24 alternatives to ZZZcalc.com

Bedtime calculator based on 90-minute sleep cycles

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes.

1. 1
   I'm Sleepy▲120

   Bedtime sleep calculator for better mornings

   2023 · sleepy.im · its alternatives →

2. 2IM
   I'm 15 and made a bedtime calculator with React JavaScript▲312

   2020 · sleepsources.com · its alternatives →

3. 3
   DozeBetter▲5

   Smart sleep calculator | optimize your sleep cycles

   2025 · dozebetter.com · its alternatives →

4. 4
   Best Time For Bed▲2

   Find your perfect bedtime based on 90-minute sleep cycles

   May 2026 · besttimeforbed.com · its alternatives →

5. 5
   Sleep Time Calculator▲12

   Calculate Your Bed Time

   2024 · its alternatives →

6. 6
   Sleep Calculator▲7

   I built Sleep Calculator to help people improve sleep quality by aligning with natural 90-minute sleep cycles. You can either: Enter your desired wake-up time to get ideal times to fall asleep, or Enter your bedtime to find optimal wake-up times.

   2025 · openmagic-data.com · its alternatives →

7. 7
   Free Sleep Calculator▲6

   Free sleep calculator and sleep cycle calculator to find your optimal bedtime and wake-up time. Calculate your REM sleep cycles for better rest and energy

   2025 · sleepcalculators.org · its alternatives →

8. 8
   Sleep Cycle Calculator by ShutEye▲4

   Best Time to Go to Bed and Wake Up

   2022 · shuteye.ai · its alternatives →

9. 9
   Bed Time Calculator - Wake Up Refreshed▲4

   Calculate when you should go to sleep based on REM cycles.

   2020 · sleepsources.com · its alternatives →

10. 10
    Sleep Calculator UK▲1

    Calculate your ideal sleep and wake times — no signup.

    Aug 2026 · sleepcalculator.org.uk · its alternatives →

11. 11
    Naploop: Sleep Calculator▲41

    Sleep cycles, alarms & sounds

    2025 · apps.apple.com · its alternatives →

12. 12
    Wake Up Time▲100

    Fall asleep and actually wake up refreshed

    2020 · wakeupti.me · its alternatives →

13. 13
    Sleepy Bedtime Calculator ▲3

    Stop Guessing, Start Resting

    Jun 2026 · sleepytime.cc · its alternatives →

14. 14
    Wakeout 2.0▲142

    250+ energizing exercises you do anywhere in 3 min or less

    2018 · apps.apple.com · its alternatives →

15. 15
    Sleep Cycle Calculator▲13

    Find your perfect bedtime & wake time

    2025 · navi-resources.com · its alternatives →

16. 16
    Sleep Calculator ForYour Perfect Bedtime

    Wake up refreshed with science-backed sleep cycles timing

    Apr 2026 · sleepcalculator.vip · its alternatives →

17. 17
    Sleep Formula▲139

    App to improve your sleep using CBT & sleep tracking

    2021 · apps.apple.com · its alternatives →

18. 18
    SleepyCalc▲6

    Calculate your perfect sleep Time

    2025 · sleepycalc.com · its alternatives →

19. 19
    SleepCalc▲1

    Free sleep calculator finds your perfect bedtime

    Mar 2026 · its alternatives →

20. 20
    SleepCalc▲4

    Go to bed at the right time in you sleep cycle!

    2021 · its alternatives →

21. 21
    Sleep Cycle By Age▲2

    A sleep cycle calculator based on your age

    Jun 2026 · sleepcyclebyage.com · its alternatives →

22. 22
    SleepCycler

    8 hours of sleep, still exhausted? You're waking mid-cycle

    Apr 2026 · sleepcycler.com · its alternatives →

23. 23
    REM SLEEP CYCLE CALCULATOR - Your health▲2

    Your Health, Understood

    Jun 2026 · remsleepcyclecalculator.com · its alternatives →

24. 24
    Sleep Time Calculator

    No more groggy mornings

    May 2026 · yoursleeptimes.com · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →