# AquaticLog vs HYDROS App

The clearest difference is in-app purchases: HYDROS App at none against AquaticLog's 3. HYDROS App also leads on iOS requirement (15.6 vs 18.1). AquaticLog's advantage is update cadence (weekly vs every 3 months) and ratings volume (401 vs 17). On price, rating, ads and device support there is nothing between them.

Both are free to download. AquaticLog sells 3 in-app purchases, starting at $4.99 per month. HYDROS App asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.2 for AquaticLog against 4.1 for HYDROS App. That said, the two scores are not equally well evidenced: AquaticLog has 401 ratings behind it against 17, so its average is the more settled of the two. Written reviews are what separate them: 71% of AquaticLog's written reviews are positive against 62% of HYDROS App's.

AquaticLog ships an update weekly, HYDROS App every 3 months. The most recent releases landed on September 21, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | AquaticLog | HYDROS App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.2 (401 ratings)](https://appshunter.io/ios/app/aquaticlog/id583895470/reviews)** | [4.1 (17 ratings)](https://appshunter.io/ios/app/hydros-app/id1455344294/reviews) |
| Number of ratings | **401** | 17 |
| Positive reviews | **70.5% of reviews** | 62.3% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 3 months |
| Monetization | Freemium | **Free** |
| Size | 21 MB | 69 MB |
| Requires iOS | 18.1 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Lonnex Inc](https://appshunter.io/developer/1547270716) | [CV Industries LLC](https://appshunter.io/developer/1455344293) |

## What reviewers say

### AquaticLog

[App page](https://appshunter.io/ios/app/aquaticlog/id583895470)

Manage your aquarium with this comprehensive platform. Track water parameters, schedule maintenance, log livestock, and document your tank's progress with photos and videos. Connect controllers for automatic data import and sync across devices.

**Highlights:** Water parameter tracking, Smart reminders for maintenance, Livestock management, Equipment and dosing logs, Controller integration, Photo and video diary, Community features

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly Subscription | $4.99 | per month |
| Pro Yearly Membership | $39.99 | per year |
| Pro Lifetime Membership | $149.99 | one-time |


### HYDROS App

[App page](https://appshunter.io/ios/app/hydros-app/id1455344294)

Easily monitor and control your aquarium's vital parameters like temperature, pH, and salinity. Manage all your connected devices, including ATOs, lights, and pumps, with a user-friendly interface. Quick setup with preset configurations means no coding is required to get your system running.

**Highlights:** Monitor temperature, ORP, pH, salinity, Control ATO, lights, heaters, pumps, User-friendly interface, Quick setup with presets, Manage multiple devices and aquariums, Set schedules and create modes

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is AquaticLog free?

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

### Is HYDROS App free?

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

### Which has better reviews, AquaticLog or HYDROS App?

AquaticLog is rated higher. AquaticLog averages 4.2 out of 5 from 401 ratings, while HYDROS App averages 4.1 from 17 ratings.

### Do AquaticLog or HYDROS App have ads?

Neither AquaticLog nor HYDROS App shows ads.

### Which is updated more often, AquaticLog or HYDROS App?

AquaticLog ships an update weekly, and HYDROS App every 3 months. Most recently, AquaticLog was updated on September 21, 2026 and HYDROS App on September 16, 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.*