Comparison

Period Tracker vs Otter Sleep

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Period Tracker

This app helps you track your menstrual cycle, predict ovulation, and log symptoms. It offers personalized insights and gentle reminders to help you understand your body better. Designed for simplicity and privacy, it's a comprehensive tool for managing your reproductive health.

Highlights
  • Menstrual cycle tracking
  • Ovulation prediction
  • Period and flow logging
  • Symptom and emotion tracking
  • Personalized insights
  • Gentle reminders
Read full description

Meet Ruby – your simple, smart, and free period tracker. Whether you want to track your menstrual cycle, get accurate ovulation predictions, or simply have a clue about your period, Ruby makes it easy to understand your body. Think of it as having Aunt Flo, Aunt Ruby, and your own personal cycle tracker all in one app. With Ruby, you can: - Log your period, flow, and symptoms with just a tap - Use our ovulation tracker to know your most fertile days - Predict cycles with a free period tracker that adapts to you - Track emotions, energy, stress, and notes in one place - Get gentle reminders for upcoming periods, ovulation, and fertile windows Why choose Ruby? - Simple & private – Easy to use, built with privacy in mind. - Your cycle, your way – From teens starting their first period, to women tracking fertility, pregnancy, or perimenopause. - More than a calendar – Ruby helps you spot patterns, manage PMS, and make your cycle feel less of a mystery. How Ruby Stands Out - Have a lively cycle every month with personalized insights. - Finally, an app that helps you truly have a clue about your period. - Forget “my cycle” being hard to remember—Ruby keeps it all logged for you. It's just a clean free period app experience. Privacy policy: https://bit.ly/rafiki-privacy-policy Terms of use: https://bit.ly/rafiki-terms-of-service

About

Otter Sleep

This app helps you sleep better by analyzing your sleep patterns and recording sounds like snoring and sleep talk. It features a cute companion named Nomi to make bedtime less lonely and offers sleep-inducing music and white noise to help you relax. Improve your sleep habits with personalized insights and a vitality development system.

Highlights
  • Sleep companion with virtual otter
  • Sleep-inducing music and white noise
  • Scientific sleep stage analysis
  • Sleep talk and snore recording
  • Vitality development system
  • Apple Health sync
Features
Read full description

Otter Sleep is your cozy bedtime companion, designed to help you relax, sleep peacefully, and build better sleep habits—one night at a time. Meet Nomi, your adorable sea otter friend. Every day, Nomi sets off on little adventures and returns at night with a new bedtime story, making each evening a little more comforting and special. Main Features ● Bedtime Stories Every night, Nomi brings home a new story from the day's adventure. Enjoy comforting bedtime tales that help you slow down, relax, and make bedtime something to look forward to. ● Sleep Audio Create your ideal bedtime atmosphere with personalized sleep stories, soothing white noise, relaxing nature sounds, and calming sleep music. ● Sleep Data Keep track of your nights with clear daily, weekly, and monthly sleep records. Easily look back on your sleep duration, bedtime, wake-up time, and other available sleep information over time. ● Sleep Recording Record nighttime sounds such as snoring and sleep talking, and review your sleep stages when available from Apple Health. Revisit your nights and discover more about what happens while you sleep. ● AI Sleep Companion Chat with your AI companion about sleep, bedtime routines, relaxation, and everyday wellness. Get friendly suggestions and inspiration to make your bedtime routine feel more comfortable and personal. ● Smart Alarms Wake up your way with Standard Alarms or Mission Alarms. Choose from different wake-up challenges to help you get out of bed and start your morning. ● Sleep Rituals Wind down with simple bedtime activities designed to help you relax and prepare for sleep. Build a calming nighttime routine that feels right for you. ● Nap & Meditation Take a break during the day with naps and calming meditation sessions, whether you need a quick recharge or a quiet moment to unwind. Why You'll Love Otter Sleep ● A cozy sea otter companion for bedtime ● Fresh bedtime stories to make every night special ● Sleep music, white noise, and relaxing sounds for every mood ● Simple daily, weekly, and monthly sleep records ● Gentle Sleep Rituals for a calmer bedtime routine ● Nap and meditation for moments of rest throughout the day ● Smart alarms that make mornings a little easier Whether you're winding down after a long day, enjoying a bedtime story, taking a quiet break, or getting ready for sleep, Nomi is here to make every moment of rest feel a little warmer. Privacy Policy:https://www.ottersleep.cn/privacy.html Terms of Service:https://www.ottersleep.cn/terms

Screenshots

Period Tracker4 screens
Otter Sleep4 screens

Verdict

The call

The clearest difference is review sentiment: Period Tracker at 100% against Otter Sleep's 62%. Period Tracker also leads on monetization model (free vs free with in-app purchases) and rating (5.0 vs 4.7). Otter Sleep's advantage is ads (none vs shown) and ratings volume (85 vs 4). On price, update cadence, in-app purchases and device support 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. Period Tracker sells 1 in-app purchase, starting at $29.99 per year and Otter Sleep sells 10 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Period Tracker holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Otter Sleep has 85 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 100% of Period Tracker's written reviews are positive against 62% of Otter Sleep's.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 weeks. Both last shipped on October 30, 2026.

Scorecard5 real differences · 5 level
Period Tracker versus Otter Sleep: the parameters behind the verdict, then further details
ParameterPeriod TrackerOtter Sleep
PriceFreeFree
Rating5.0 (4 ratings) — better4.7 (85 ratings)
Positive reviews100.0% of reviews — better61.5% of reviews
Number of ratings485 — better
Update frequencyEvery 2 weeksEvery 2 weeks
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad — betteriPhone
Requires iOS17.016.0 — better
Further details — not scored
Size47 MB158 MB
Age rating12+4+
DeveloperRafiki AppsChongqing Cuyi Technology Co., Ltd

Customer experience

Period Tracker

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Otter Sleep

All ratings85 ratings
Positive90.6%
Neutral4.7%
Negative4.7%
Written reviews13 reviews
Positive61.5%
Neutral7.7%
Negative30.8%

In-app purchases

1 purchases

Period Tracker

Subscriptions1
  • Ruby Premium7 Days trial$29.991 Year
10 purchases

Otter Sleep

Subscriptions10
  • weekly subscription$2.997 Days
  • weekly subscription$5.997 Days
  • weekly subscription$7.997 Days
Show 7 more
  • monthly subscription$7.991 Month
  • monthly subscription$9.991 Month
  • yearly subscription7 Days trial$14.991 Year
  • yearly subscription7 Days trial$17.991 Year
  • yearly subscription7 Days trial$29.991 Year
  • yearly subscription3 Days trial$29.991 Year
  • yearly subscription$29.991 Year

Questions

Is Period Tracker free?
Period Tracker is free to download, with in-app purchases available.
Is Otter Sleep free?
Otter Sleep is free to download, with in-app purchases available.
Which has better reviews, Period Tracker or Otter Sleep?
Period Tracker is rated higher. Period Tracker averages 5.0 out of 5 from 4 ratings, while Otter Sleep averages 4.7 from 85 ratings.
Do Period Tracker or Otter Sleep have ads?
Period Tracker shows ads; Otter Sleep does not.
Which is updated more often, Period Tracker or Otter Sleep?
Period Tracker ships an update every 2 weeks, and Otter Sleep every 2 weeks. Most recently, Period Tracker was updated on October 30, 2026 and Otter Sleep on October 30, 2026.

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