# CycleFasting vs Red Diary

The clearest difference is iOS requirement: CycleFasting at 15.0 against Red Diary's 17.6. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. CycleFasting sells 3 in-app purchases, starting at $7.99 per month and Red Diary sells 2 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 3 days. The most recent releases landed on October 24, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | CycleFasting | Red Diary |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (9 ratings)](https://appshunter.io/ios/app/red-diary-period-tracker/id6767368239/reviews)** |
| Number of ratings | — | **9** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 days | Every 3 days |
| Monetization | — | Freemium |
| Size | 25 MB | 8 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Age rating | 12+ | 12+ |
| Developer | [Zorana Raicic](https://appshunter.io/developer/1882648182) | [RUBINS DORMEUS](https://appshunter.io/developer/1884865930) |

## What reviewers say

### CycleFasting

[App page](https://appshunter.io/ios/app/cyclefasting/id6760101500)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $7.99 | per month |
| 6 Months | $39.99 | per 6 months |
| Yearly | $64.99 | per year |


### Red Diary

[App page](https://appshunter.io/ios/app/red-diary-period-tracker/id6767368239)

This app analyzes your symptoms, mood, energy, sleep, and activity to provide personalized insights and daily guidance tailored to your cycle phases. It offers a body weather forecast and smart recommendations for exercise, nutrition, and self-care.

**Highlights:** Personalized cycle insights, Smart daily guidance, Body weather forecast, Cycle tracking modes (fertility, pregnancy, birth control), Symptom and mood logging, HealthKit integration, Apple Watch companion app

**Features:** macOS Compatibility, Apple Watch app

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $0.99 | per month |
| Premium Annual | $4.99 | per year |


## Frequently asked questions

### Is CycleFasting free?

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

### Is Red Diary free?

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

### Do CycleFasting or Red Diary have ads?

Neither CycleFasting nor Red Diary shows ads.

### Which is updated more often, CycleFasting or Red Diary?

CycleFasting ships an update every 3 days, and Red Diary every 3 days. Most recently, CycleFasting was updated on October 24, 2026 and Red Diary on October 16, 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.*