# 28X Private Period Tracker vs RTMB

The clearest difference is in-app purchases: RTMB at none against 28X Private Period Tracker's 1. 28X Private Period Tracker's advantage is update cadence (weekly vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. 28X Private Period Tracker sells 1 one-off in-app purchase. RTMB asks for nothing beyond the download.

28X Private Period Tracker ships an update weekly, RTMB every 3 weeks. The most recent releases landed on October 17, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | 28X Private Period Tracker | RTMB |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/28x-private-period-tracker/id6747716043/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 3 weeks |
| Monetization | Free | — |
| Size | 100 MB | 41 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [28x](https://appshunter.io/developer/1822565803) | [Toby Challis](https://appshunter.io/developer/1846961528) |

## What reviewers say

### 28X Private Period Tracker

[App page](https://appshunter.io/ios/app/28x-private-period-tracker/id6747716043)

Understand your menstrual cycle with a privacy-focused period tracker. Log moods, symptoms, and gain insights into your body's patterns from first periods to menopause. All your data stays on your device, with no ads or data selling.

**Highlights:** Period and cycle tracking, Menstrual phase predictions, Mood, energy, and symptom logging, Clinically informed women's health content, Data stored locally on device, No ads, subscriptions, or data selling

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| NEON Butterfly | $1.99 | one-time |


### RTMB

[App page](https://appshunter.io/ios/app/rtmb/id6761845733)

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

**In-app purchases:** none


## Frequently asked questions

### Is 28X Private Period Tracker free?

28X Private Period Tracker is free to download, with in-app purchases available.

### Is RTMB free?

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

### Do 28X Private Period Tracker or RTMB have ads?

Neither 28X Private Period Tracker nor RTMB shows ads.

### Which is updated more often, 28X Private Period Tracker or RTMB?

28X Private Period Tracker ships an update weekly, and RTMB every 3 weeks. Most recently, 28X Private Period Tracker was updated on October 17, 2026 and RTMB on September 27, 2026.

---

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