# Aquarimate vs O

The clearest difference is price: O at Free against Aquarimate's $9.99. O also leads on in-app purchases (none vs 2). Aquarimate's advantage is update cadence (every 3 weeks vs every 13 months) and chart position (#139 vs unranked). On ads there is nothing between them.

O is free to download; Aquarimate costs $9.99 up front. Aquarimate sells 2 in-app purchases, starting at $9.99 per year. O asks for nothing beyond the download.

Aquarimate ships an update every 3 weeks, O every 13 months. The most recent releases landed on October 18, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Aquarimate | O |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | **[4.4 (625 ratings)](https://appshunter.io/ios/app/aquarimate/id587215055/reviews)** | — |
| Number of ratings | **625** | — |
| Positive reviews | 64.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 13 months |
| Monetization | Free with in-app purchases | — |
| Best chart rank | **#139** | — |
| Size | 48 MB | 5 MB |
| Requires iOS | **14.0** | 16.2 |
| Devices | **iPhone, iPad, iPod, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [WiseLogic Inc](https://appshunter.io/developer/554628754) | [AppBakkers BV](https://appshunter.io/developer/1104913401) |

## What reviewers say

### Aquarimate

[App page](https://appshunter.io/ios/app/aquarimate/id587215055)

**Currently charting:** #139 Top Paid · Productivity (US App Store)

Manage freshwater and saltwater aquariums with this comprehensive app. Track parameters, schedule tasks, log activities, and access a vast livestock library with compatibility advice. Organize notes, expenses, and photos, with cloud backup and cross-device syncing.

**Highlights:** Unlimited aquarium management, Parameter test result logging, Customizable tank parameters, Advanced unit converters and dosing calculators, Husbandry task scheduling and reminders, Comprehensive livestock library (Aquaribase), Photo gallery and expense tracking

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Additional 1 GB For Aquarimate Cloud Storage Service | $9.99 | per year |
| Aquarimate Live Subscription | $9.99 | per year |

**What reviewers like**

- 💻 Great app for managing aquariums
- 📊 Excellent data tracking and graphing
- ⏰ Helpful reminders and task management
- 🗂️ Comprehensive database of aquatic life
- 🤖 Useful calculators and tools

**What reviewers complain about**

- 🐛 Frequent crashes and bugs
- 💰 Expensive with additional subscription fees
- 🕸️ Outdated and clunky user interface
- 🗃️ Limited database of fish and plants
- 🔍 Poor customer support and lack of updates

**Reported bugs**

- App crashes when accessing settings
- Water parameter data not saving correctly
- Livestock information not syncing across devices
- Calculators providing inaccurate results
- Calendar integration not working as expected

**Requested features**

- Ability to copy settings and data across tanks
- More advanced analytics and reporting
- Improved syncing and cross-device access
- Expanded database of aquatic species
- Customizable dashboards and views


### O

[App page](https://appshunter.io/ios/app/o-ringeu/id6450456605)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Aquarimate free?

Aquarimate costs $9.99, and also offers in-app purchases.

### Is O free?

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

### Do Aquarimate or O have ads?

Neither Aquarimate nor O shows ads.

### Which is updated more often, Aquarimate or O?

Aquarimate ships an update every 3 weeks, and O every 13 months. Most recently, Aquarimate was updated on October 18, 2026 and O on September 13, 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.*