# EpiDiary vs HydroFlow Ocean

The clearest difference is review sentiment: HydroFlow Ocean at 100% against EpiDiary's 42%. HydroFlow Ocean also leads on rating (5.0 vs 4.5). EpiDiary's advantage is in-app purchases (none vs 1) and ratings volume (45 vs 3). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. HydroFlow Ocean sells 1 one-off in-app purchase. EpiDiary asks for nothing beyond the download.

HydroFlow Ocean holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: EpiDiary has 45 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 42% of EpiDiary's written reviews are positive against 100% of HydroFlow Ocean's.

EpiDiary ships an update fortnightly, HydroFlow Ocean every 5 weeks. The most recent releases landed on October 15, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | EpiDiary | HydroFlow Ocean |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (45 ratings)](https://appshunter.io/ios/app/epidiary/id362460642/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/hydroflow-ocean/id6794131333/reviews)** |
| Number of ratings | **45** | 3 |
| Positive reviews | 41.7% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 5 weeks |
| Monetization | **Free** | Free with in-app purchases |
| Size | 129 MB | 46 MB |
| Requires iOS | **16.4** | 17.6 |
| Devices | iPhone | **iPhone, Apple Watch** |
| Age rating | 12+ | 12+ |
| Developer | [Irody Inc.](https://appshunter.io/developer/362460645) | [Ningzhe Wen](https://appshunter.io/developer/6794131335) |

## What reviewers say

### EpiDiary

[App page](https://appshunter.io/ios/app/epidiary/id362460642)

This app helps individuals with epilepsy track seizures, medications, and symptoms. It features visual medication management and allows for detailed recording of moods, triggers, and side effects. Data syncs to a web platform for personalized reports to share with healthcare providers.

**Highlights:** Record and monitor seizures, Track epilepsy medications, Record triggers and side effects, Visual medication management, Generate personalized reports, Sync data to web platform

**Features:** macOS Compatibility

**In-app purchases:** none


### HydroFlow Ocean

[App page](https://appshunter.io/ios/app/hydroflow-ocean/id6794131333)

This app transforms daily water intake into a growing virtual ocean filled with collectible marine creatures. Track your hydration, earn achievements, and visualize your progress with interactive widgets and Apple Watch integration.

**Highlights:** One-tap water logging, Living ocean visualization, Collectible marine creatures, Daily and weekly analytics, Home screen widget, Apple Watch integration, Optional Apple Health sync

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HydroFlow Pro | $3.99 | one-time |


## Frequently asked questions

### Is EpiDiary free?

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

### Is HydroFlow Ocean free?

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

### Which has better reviews, EpiDiary or HydroFlow Ocean?

HydroFlow Ocean is rated higher. EpiDiary averages 4.5 out of 5 from 45 ratings, while HydroFlow Ocean averages 5.0 from 3 ratings.

### Do EpiDiary or HydroFlow Ocean have ads?

Neither EpiDiary nor HydroFlow Ocean shows ads.

### Which is updated more often, EpiDiary or HydroFlow Ocean?

EpiDiary ships an update fortnightly, and HydroFlow Ocean every 5 weeks. Most recently, EpiDiary was updated on October 15, 2026 and HydroFlow Ocean on October 7, 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.*