Comparison

Oky Period Tracker vs Vimi

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

Head to head
About

Oky Period Tracker

This app helps young girls manage their menstrual cycles. It offers personalized predictions, tracks body and mood changes, and provides reliable health information and tips. The goal is to make periods less stressful and empower users.

Highlights
  • Period tracking
  • Personalized predictions
  • Mood and body tracking
  • Health facts and tips
  • Stress-free period management
Features
Read full description

Oky is a mobile app for girls (age 10+) that helps you to take control of your periods and your lives through a bit of fun! With Oky you can track how your period affects your body and mood so you can get to know you, get personalised predictions so you can plan ahead, and learn the facts with trustworthy information and tips to stay healthy and happy. Download it now and see how Oky can make your periods stress free!

About

Vimi

This AI-powered math tutor creates personalized learning paths to help users master math concepts. It offers adaptive lessons, clear explanations, and engaging exercises tailored to school curricula, making learning approachable and fun.

Highlights
  • Personalized learning paths
  • Adaptive lessons
  • Curriculum-aligned content
  • Clear explanations
  • Engaging exercises
  • Instant feedback and solutions
  • Progress tracking
Features
Currently charting
Read full description

Master math with Vimi, your personal AI tutor that makes learning simple, fast, and fun. Vimi figures out your level and designs a personalized path that fits you. You’ll get quick, adaptive lessons that fill in your knowledge gaps and help you feel in control again. Vimi helps you finally feel confident in class with short, engaging lessons built around your school’s curriculum, so every topic you practice matches what you’re learning in school. It’s like having a friendly local tutor who explains things clearly, no confusing terms, just simple explanations that actually make sense. With Vimi, math feels approachable and fun, thanks to a game-like experience that keeps you motivated. Each session includes short exercises that focus on what you need most, instant feedback with helpful hints and full solutions, plus a progress tracker so you can see how far you’ve come. Learn key topics including: Fractions, percentages, equations, inequalities, geometry, functions, probability, statistics, logic, and more. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Oky Period Tracker4 screens
Vimi4 screens

Verdict

The call

The clearest difference is rating: Vimi at 4.5 against Oky Period Tracker's 3.1. Vimi also leads on review sentiment (57% vs 33%) and update cadence (every 9 days vs every 6 weeks). Oky Period Tracker's advantage is in-app purchases (none vs 10) and ads (none vs shown). On price, monetization model 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. Vimi sells 10 in-app purchases, starting at $19.99 per month. Oky Period Tracker asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Vimi holds the better App Store score, 4.5 against 3.1. That said, the two scores are not equally well evidenced: Vimi has 1.1K ratings behind it against 47, so its average is the more settled of the two. Written reviews point the same way: 33% of Oky Period Tracker's written reviews are positive against 57% of Vimi's.

UpkeepUpdate frequency

Oky Period Tracker ships an update every 6 weeks, Vimi every 9 days. The most recent releases landed on November 3, 2026 and November 8, 2026 respectively.

Scorecard8 real differences · 3 level
Oky Period Tracker versus Vimi: the parameters behind the verdict, then further details
ParameterOky Period TrackerVimi
PriceFreeFree
Rating3.1 (47 ratings)4.5 (1.1K ratings) — better
Positive reviews33.3% of reviews57.1% of reviews — better
Number of ratings471.1K — better
Update frequencyEvery 6 weeksEvery 9 days — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFreeFree
Best chart rank—#130 — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.1 — better17.6
Further details — not scored
Size79 MB123 MB
Age rating4+4+
DeveloperUNICEFVIMI ADAPTIVE LEARNING LTD

Customer experience

Oky Period Tracker

All ratings43 ratings
Positive53.5%
Neutral2.3%
Negative44.2%
Written reviews33 reviews
Positive33.3%
Neutral0.0%
Negative66.7%

Vimi

All ratings1,005 ratings
Positive88.0%
Neutral2.7%
Negative9.4%
Written reviews119 reviews
Positive57.1%
Neutral10.1%
Negative32.8%

In-app purchases

None

Oky Period Tracker

No in-app purchases

10 purchases

Vimi

Subscriptions10
  • Vimi Monthly Premium1 Month trial$19.991 Month
  • summer_promotion1 Month trial$19.991 Month
  • Vimi Monthly Premium3 Days trial$19.991 Month
Show 7 more
  • Vimi Monthly Premium7 Days trial$19.991 Month
  • Vimi monthly Premium$19.991 Month
  • Vimi Monthly Premium1 Month trial$24.991 Month
  • Vimi Quarterly Premium3 Days trial$44.993 Months
  • Vimi 3 months subscription3 Days trial$44.993 Months
  • Vimi Annual Premium3 Days trial$94.901 Year
  • Vimi Premium Annual7 Days trial$154.991 Year

Questions

Is Oky Period Tracker free?
Oky Period Tracker is free to download, with no in-app purchases.
Is Vimi free?
Vimi is free to download, with in-app purchases available.
Which has better reviews, Oky Period Tracker or Vimi?
Vimi is rated higher. Oky Period Tracker averages 3.1 out of 5 from 47 ratings, while Vimi averages 4.5 from 1.1K ratings.
Do Oky Period Tracker or Vimi have ads?
Vimi shows ads; Oky Period Tracker does not.
Which is updated more often, Oky Period Tracker or Vimi?
Oky Period Tracker ships an update every 6 weeks, and Vimi every 9 days. Most recently, Oky Period Tracker was updated on November 3, 2026 and Vimi on November 8, 2026.

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