Work · alternatives · 2026

24 alternatives to IO Calculators

Free, responsive tool to calculate your perfect sleep cycle.

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

1
I'm Sleepy▲120
Bedtime sleep calculator for better mornings
2023 · sleepy.im · its alternatives →
2
Naploop: Sleep Calculator▲41
Sleep cycles, alarms & sounds
2025 · apps.apple.com · its alternatives →
3IM
I'm 15 and made a bedtime calculator with React JavaScript▲312
2020 · sleepsources.com · its alternatives →
4
Bed Time Calculator - Wake Up Refreshed▲4
Calculate when you should go to sleep based on REM cycles.
2020 · sleepsources.com · its alternatives →
5
Wake Up Time▲100
Fall asleep and actually wake up refreshed
2020 · wakeupti.me · its alternatives →
6
Sleep Calculator▲9
Would you like to wake up feeling more energetic? Sleep Calculator will show you the best time to sleep or wake up for a refreshed start to your day.
2025 · sleepcalculators.com · its alternatives →
7
Sleep Time Calculator▲12
Calculate Your Bed Time
2024 · its alternatives →
8
Hypnos▲78
Hypnos calculates your sleep cycles and set morning alarm.
2020 · apps.apple.com · its alternatives →
9
Sleep Formula▲139
App to improve your sleep using CBT & sleep tracking
2021 · apps.apple.com · its alternatives →
10
Sleep Better▲105
Track sleep cycles, monitor dreams & improve bedtime habits
2017 · play.google.com · its alternatives →
11
Sleep Cycle Calculator by ShutEye▲4
Best Time to Go to Bed and Wake Up
2022 · shuteye.ai · its alternatives →
12
Free Sleep Calculator Tool By ShutEye▲5
Sleep Tracking App to Monitor Your Sleep Cycle
2024 · shuteye.ai · its alternatives →
13
Sleep Cycle Calculator▲13
Find your perfect bedtime & wake time
2025 · navi-resources.com · its alternatives →
14
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 →
15
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 →
16
Real Sleep Calculator▲1
Sleep smarter. Wake refreshed. Live better.
Aug 2026 · realsleepcalculator.com · its alternatives →
17
SleepCalculators.net▲6
Free sleep tools to help you wake up refreshed
2025 · sleepcalculators.net · its alternatives →
18
DozeBetter▲5
Smart sleep calculator | optimize your sleep cycles
2025 · dozebetter.com · its alternatives →
19
Sleep Debt Calculator▲26
Free sleep tools: 34 instant calculators covering sleep debt, cycles, caffeine, naps, and jet lag — all free, no signup required.
2013 · sleepdebtcalc.com · its alternatives →
20
SleepCycle▲112
A bio-alarm clock that analyzes your sleep pattern
2014 · sleepcycle.com · its alternatives →
21
WOW Sleep Calculator▲3
Plan better sleep, wake times and daily wellness
Jul 2026 · wowsleepcalculator.com · its alternatives →
22
Sleep Calculator Ai▲3
Find out the perfect bedtime or wake up time to rise feeling
2025 · sleepcalculatorai.com · its alternatives →
23
Sleep Cycle▲1
“Track your cycles, optimize your mornings.”
Feb 2026 · calculatortoolnation.com · its alternatives →
24
Sleeep▲154
Sleep well and never feel tired again (for real) 😴
2019 · sleep.netlify.app · its alternatives →

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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 →