# Aquarist's Notes vs Reefi

The clearest difference is ads: Aquarist's Notes at none against Reefi's shown. On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Aquarist's Notes sells 2 in-app purchases, starting at $1.99 per month and Reefi sells 3 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Aquarist's Notes ships an update every 6 days, Reefi every 10 days. Both last shipped on October 30, 2026.

## The numbers

| Metric | Aquarist's Notes | Reefi |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/reefi-aquarium-tracker/id6756351188/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 6 days** | Every 10 days |
| Monetization | — | Free with in-app purchases |
| Size | 16 MB | 65 MB |
| Requires iOS | 16.4 | **15.1** |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ludek Slouf](https://appshunter.io/developer/1664390856) | [Tibbe Naarding](https://appshunter.io/developer/1860234190) |

## What reviewers say

### Aquarist's Notes

[App page](https://appshunter.io/ios/app/aquarists-notes/id6451252680)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly subscription | $1.99 | per month |
| Annual subscription | $9.99 | per year |


### Reefi

[App page](https://appshunter.io/ios/app/reefi-aquarium-tracker/id6756351188)

This app helps aquarium owners manage their tanks with smart tools for tracking water parameters, maintenance, and livestock health. It provides reminders, a dosing calculator, and an AI coach to ensure a healthy aquatic ecosystem.

**Highlights:** Water parameter tracking, Maintenance reminders, Dosing calculator, Livestock health logs, Equipment management, AI aquarium coach

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Reefi Pro Weekly | $3.99 | per 7 days |
| Reefi Pro Monthly | $9.99 | per month |
| Reefi Pro Annual | $79.99 | per year |


## Frequently asked questions

### Is Aquarist's Notes free?

Aquarist's Notes is free to download, with in-app purchases available.

### Is Reefi free?

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

### Do Aquarist's Notes or Reefi have ads?

Reefi shows ads; Aquarist's Notes does not.

### Which is updated more often, Aquarist's Notes or Reefi?

Aquarist's Notes ships an update every 6 days, and Reefi every 10 days. Most recently, Aquarist's Notes was updated on October 30, 2026 and Reefi on October 30, 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.*