# Siela vs Cycle Sister

The clearest difference is in-app purchases: Siela at none against Cycle Sister's 2. Siela also leads on ads (none vs shown) and update cadence (every 4 days vs every 2 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Cycle Sister sells 2 in-app purchases, starting at $0.99 per month. Siela asks for nothing beyond the download.

Siela ships an update every 4 days, Cycle Sister every 2 months. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Siela | Cycle Sister |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 4 days** | Every 2 months |
| Size | 69 MB | 30 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 12+ | 17+ |
| Developer | [Tomas Sekera](https://appshunter.io/developer/1895287822) | [CloudSpirit Limited](https://appshunter.io/developer/816154234) |

## What reviewers say

### Siela

[App page](https://appshunter.io/ios/app/siela/id6763377866)

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

**In-app purchases:** none


### Cycle Sister

[App page](https://appshunter.io/ios/app/cycle-sister/id6777260058)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Premium | $0.99 | per month |
| Yearly Premium | $9.99 | per year |


## Frequently asked questions

### Is Siela free?

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

### Is Cycle Sister free?

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

### Do Siela or Cycle Sister have ads?

Cycle Sister shows ads; Siela does not.

### Which is updated more often, Siela or Cycle Sister?

Siela ships an update every 4 days, and Cycle Sister every 2 months. Most recently, Siela was updated on November 5, 2026 and Cycle Sister on October 31, 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.*