# RhythmX vs AsterKit

The clearest difference is device support: AsterKit at 3 against RhythmX's 1. AsterKit also leads on iOS requirement (15.1 vs 26.0). On price, update cadence, ads and in-app purchases there is nothing between them.

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

RhythmX ships an update fortnightly, AsterKit every 2 weeks. The most recent releases landed on November 4, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | RhythmX | AsterKit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rhythmx-period-tracker/id6740507389/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 7 MB | 43 MB |
| Requires iOS | 26.0 | **15.1** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 12+ | 12+ |
| Developer | [ShapeHaven Innovations LLC](https://appshunter.io/developer/1747127977) | [Ryan Gonzalez](https://appshunter.io/developer/6772702194) |

## What reviewers say

### RhythmX

[App page](https://appshunter.io/ios/app/rhythmx-period-tracker/id6740507389)

This app helps you understand your menstrual cycle with a focus on privacy and simplicity. It offers insights into your cycle phases, custom tracking, and educational content without collecting your personal data. All data is stored on your device, and the app is open source.

**Highlights:** Cycle phase insights, Customizable symptom tracking, Phase calendar view, Educational phase information, On-device data storage, Open source code, Optional period reminders

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| RhythmX Plus Monthly | $1.99 | per month |
| PDF Day Pass | $0.99 | one-time |


### AsterKit

[App page](https://appshunter.io/ios/app/asterkit/id6772702192)

**Features:** Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AsterKit Premium | $4.99 | one-time |


## Frequently asked questions

### Is RhythmX free?

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

### Is AsterKit free?

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

### Do RhythmX or AsterKit have ads?

Neither RhythmX nor AsterKit shows ads.

### Which is updated more often, RhythmX or AsterKit?

RhythmX ships an update fortnightly, and AsterKit every 2 weeks. Most recently, RhythmX was updated on November 4, 2026 and AsterKit on November 5, 2026.

---

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