# Ocras vs Flow

The clearest difference is update cadence: Ocras at every 4 days against Flow's every 3 weeks. Ocras also leads on device support (3 vs 1). On price, ads, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Ocras ships an update every 4 days, Flow every 3 weeks. The most recent releases landed on October 10, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Ocras | Flow |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 3 weeks |
| Size | 53 MB | 4 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | **iPhone, iPad, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [CONOR LUDDY](https://appshunter.io/developer/1812189044) | [拥军 刘](https://appshunter.io/developer/1896777340) |

## What reviewers say

### Ocras

[App page](https://appshunter.io/ios/app/ocras-intermittent-fasting/id6762506849)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


### Flow

[App page](https://appshunter.io/ios/app/flow-period-tracker/id6791552767)

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

**In-app purchases:** none


## Frequently asked questions

### Is Ocras free?

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

### Is Flow free?

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

### Do Ocras or Flow have ads?

Neither Ocras nor Flow shows ads.

### Which is updated more often, Ocras or Flow?

Ocras ships an update every 4 days, and Flow every 3 weeks. Most recently, Ocras was updated on October 10, 2026 and Flow on October 6, 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.*