# Hydro  Reminder vs Octi Flow

The clearest difference is in-app purchases: Hydro  Reminder at none against Octi Flow's 1. Hydro  Reminder also leads on update cadence (daily vs every 2 weeks) and iOS requirement (13.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. Octi Flow sells 1 in-app purchase, starting at $7.99 per year. Hydro  Reminder asks for nothing beyond the download.

Hydro  Reminder ships an update daily, Octi Flow every 2 weeks. The most recent releases landed on October 18, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | Hydro  Reminder | Octi Flow |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Daily** | Every 2 weeks |
| Size | 28 MB | 169 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Renato Ferreira silva junior](https://appshunter.io/developer/1851021728) | [Katsiaryna Filimonava](https://appshunter.io/developer/6783334532) |

## What reviewers say

### Hydro  Reminder

[App page](https://appshunter.io/ios/app/hydro-reminder/id6754942805)

**Features:** macOS Compatibility

**In-app purchases:** none


### Octi Flow

[App page](https://appshunter.io/ios/app/octi-flow-water-tracker/id6783334530)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Octi Premium | $7.99 | per year |


## Frequently asked questions

### Is Hydro  Reminder free?

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

### Is Octi Flow free?

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

### Do Hydro  Reminder or Octi Flow have ads?

Neither Hydro  Reminder nor Octi Flow shows ads.

### Which is updated more often, Hydro  Reminder or Octi Flow?

Hydro  Reminder ships an update daily, and Octi Flow every 2 weeks. Most recently, Hydro  Reminder was updated on October 18, 2026 and Octi Flow on October 19, 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.*