# Selene vs Rainbow data

The clearest difference is in-app purchases: Rainbow data at none against Selene's 1. Rainbow data also leads on iOS requirement (13.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Selene sells 1 in-app purchase, starting at $9.99 per year. Rainbow data asks for nothing beyond the download.

Selene ships an update monthly, Rainbow data every 3 weeks. Both last shipped on October 29, 2026.

## The numbers

| Metric | Selene | Rainbow data |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (5 ratings)](https://appshunter.io/ios/app/selene-bbt-and-period-tracker/id974923308/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | Freemium | — |
| Size | 51 MB | 29 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 12+ | 17+ |
| Developer | [Satomi Furusawa](https://appshunter.io/developer/974923307) | [Various MB](https://appshunter.io/developer/1540440733) |

## What reviewers say

### Selene

[App page](https://appshunter.io/ios/app/selene-bbt-and-period-tracker/id974923308)

This app helps you understand your body's natural cycles by tracking your period, basal body temperature, and ovulation. It offers simple logging and beautiful visualizations to help you manage your health and fertility.

**Highlights:** Period cycle management, Basal body temperature tracking, Ovulation prediction, Cervical mucus tracking, Simple logging with haptic feedback, Data sync with Health app, Beautiful calendar and graph views

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Selene PLUS | $9.99 | per year |


### Rainbow data

[App page](https://appshunter.io/ios/app/rainbow-data/id1540440731)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Selene free?

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

### Is Rainbow data free?

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

### Do Selene or Rainbow data have ads?

Neither Selene nor Rainbow data shows ads.

### Which is updated more often, Selene or Rainbow data?

Selene ships an update monthly, and Rainbow data every 3 weeks. Most recently, Selene was updated on October 29, 2026 and Rainbow data on October 29, 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.*