# Oky Period Tracker vs Instant Math Cards

The clearest difference is in-app purchases: Oky Period Tracker at none against Instant Math Cards's 1. Oky Period Tracker also leads on iOS requirement (15.1 vs 17.5). Instant Math Cards's advantage is update cadence (every 3 weeks vs every 6 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Instant Math Cards sells 1 one-off in-app purchase. Oky Period Tracker asks for nothing beyond the download.

Oky Period Tracker ships an update every 6 weeks, Instant Math Cards every 3 weeks. The most recent releases landed on November 3, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Oky Period Tracker | Instant Math Cards |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.1 (47 ratings)](https://appshunter.io/ios/app/oky-period-tracker/id1551481098/reviews)** | — |
| Number of ratings | **47** | — |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 79 MB | 14 MB |
| Requires iOS | **15.1** | 17.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [UNICEF](https://appshunter.io/developer/446804206) | [Jackson Dow](https://appshunter.io/developer/1748049151) |

## What reviewers say

### Oky Period Tracker

[App page](https://appshunter.io/ios/app/oky-period-tracker/id1551481098)

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:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Instant Math Cards

[App page](https://appshunter.io/ios/app/instant-math-cards/id6553973433)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Features Access | $2.99 | one-time |


## Frequently asked questions

### Is Oky Period Tracker free?

Oky Period Tracker is free to download, with no in-app purchases.

### Is Instant Math Cards free?

Instant Math Cards is free to download, with in-app purchases available.

### Do Oky Period Tracker or Instant Math Cards have ads?

Neither Oky Period Tracker nor Instant Math Cards shows ads.

### Which is updated more often, Oky Period Tracker or Instant Math Cards?

Oky Period Tracker ships an update every 6 weeks, and Instant Math Cards every 3 weeks. Most recently, Oky Period Tracker was updated on November 3, 2026 and Instant Math Cards on October 24, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*