# Flymark vs Selin

The clearest difference is in-app purchases: Flymark at none against Selin's 2. Flymark also leads on ads (none vs shown). Selin's advantage is update cadence (weekly vs every 3 months) and iOS requirement (13.0 vs 15.6). On price and device support there is nothing between them.

Both are free to download. Selin sells 2 in-app purchases, starting at $7.99 per month. Flymark asks for nothing beyond the download.

Flymark ships an update every 3 months, Selin weekly. Both last shipped on November 3, 2026.

## The numbers

| Metric | Flymark | Selin |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.3 (10 ratings)](https://appshunter.io/ios/app/selin-period-tracker/id1669125246/reviews)** |
| Number of ratings | — | **10** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 28 MB | 57 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Volodymyr Bilyachat](https://appshunter.io/developer/1242664098) | [Tech Brit, Inc](https://appshunter.io/developer/1669125248) |

## What reviewers say

### Flymark

[App page](https://appshunter.io/ios/app/flymark/id1267197364)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Selin

[App page](https://appshunter.io/ios/app/selin-period-tracker/id1669125246)

Track your menstrual cycle, predict periods and ovulation, and log symptoms and moods. Offers personalized reminders and educational health insights. Helps understand your cycle patterns and plan ahead.

**Highlights:** Period tracking, Ovulation prediction, Symptom and mood logging, Personalized reminders, Cycle history analysis, Educational health articles

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 month | $7.99 | per month |
| 1 year | $47.95 | per year |


## Frequently asked questions

### Is Flymark free?

Flymark is free to download, with no in-app purchases.

### Is Selin free?

Selin is free to download, with in-app purchases available.

### Do Flymark or Selin have ads?

Selin shows ads; Flymark does not.

### Which is updated more often, Flymark or Selin?

Flymark ships an update every 3 months, and Selin weekly. Most recently, Flymark was updated on November 3, 2026 and Selin on November 3, 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.*