# Selene vs BabySync

The clearest difference is update cadence: BabySync at every 3 days against Selene's monthly. Selene's advantage is iOS requirement (15.1 vs 18.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Selene sells 1 one-off in-app purchase and BabySync sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

Selene ships an update monthly, BabySync every 3 days. The most recent releases landed on October 16, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Selene | BabySync |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 days** |
| Size | 41 MB | 14 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Aiofeffect LLC](https://appshunter.io/developer/1833105894) | [SERKAN AZERI](https://appshunter.io/developer/1879738514) |

## What reviewers say

### Selene

[App page](https://appshunter.io/ios/app/selene-period-tracker/id6757160714)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Selene Lifetime | $1.99 | one-time |


### BabySync

[App page](https://appshunter.io/ios/app/babysync-pregnancy-tracker/id6761660965)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| BabySync Premium Monthly | $1.99 | per month |
| BabySync Premium Yearly | $9.99 | per year |


## Frequently asked questions

### Is Selene free?

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

### Is BabySync free?

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

### Do Selene or BabySync have ads?

Neither Selene nor BabySync shows ads.

### Which is updated more often, Selene or BabySync?

Selene ships an update monthly, and BabySync every 3 days. Most recently, Selene was updated on October 16, 2026 and BabySync on October 25, 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.*