# Flow Fasting Tracker vs Olla Period App

The clearest difference is update cadence: Olla Period App at every 3 days against Flow Fasting Tracker's every 10 days. Flow Fasting Tracker's advantage is device support (3 vs 1) and iOS requirement (13.0 vs 26.5). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Flow Fasting Tracker sells 2 in-app purchases, starting at $7.99 per month and Olla Period App sells 2 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Flow Fasting Tracker ships an update every 10 days, Olla Period App every 3 days. Both last shipped on October 31, 2026.

## The numbers

| Metric | Flow Fasting Tracker | Olla Period App |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 10 days | **Every 3 days** |
| Size | 16 MB | 16 MB |
| Requires iOS | **13.0** | 26.5 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Kristina Kozicynaite](https://appshunter.io/developer/1882882099) | [Katja Nina Kolari](https://appshunter.io/developer/1839369029) |

## What reviewers say

### Flow Fasting Tracker

[App page](https://appshunter.io/ios/app/flow-fasting-tracker/id6776109275)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $7.99 | per month |
| Annual | $39.99 | per year |


### Olla Period App

[App page](https://appshunter.io/ios/app/olla-period-app/id6810021264)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Olla Weekly Subscription | $2.99 | per 7 days |
| Olla Annual | $19.99 | per year |


## Frequently asked questions

### Is Flow Fasting Tracker free?

Flow Fasting Tracker is free to download, with in-app purchases available.

### Is Olla Period App free?

Olla Period App is free to download, with in-app purchases available.

### Do Flow Fasting Tracker or Olla Period App have ads?

Neither Flow Fasting Tracker nor Olla Period App shows ads.

### Which is updated more often, Flow Fasting Tracker or Olla Period App?

Flow Fasting Tracker ships an update every 10 days, and Olla Period App every 3 days. Most recently, Flow Fasting Tracker was updated on October 31, 2026 and Olla Period App 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.*