Aquarist's Notes vs Reefi
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Aquarist's Notes
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Aquarium health monitoring app. The Aquarist's Notes allows you to record important water parameters such as temperature, pH, hardness and other factors that affect fish and plant health, add notes and keep a diary. You can add photos from the system photo album directly to the app and add comments or save documents such as aquarium inventory guides. All of this information will be easily accessible and organized right in the app. The Aquarist's Notes will make calculations related to water treatment easier. The app provides accurate calculations of the amount of additives and chemicals you need for proper water treatment in aquariums. Calculators are available for calculating water volume depending on tank dimensions and amount of decorations, for unit conversions and more. Reminders and a calendar will simplify your aquarium maintenance planning and you'll never forget anything important again. Thanks to iCloud, all information can be available on all your devices. Terms of use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://aquariumnote.lvslo.eu/app-privacy.html
Reefi
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.
- Water parameter tracking
- Maintenance reminders
- Dosing calculator
- Livestock health logs
- Equipment management
- AI aquarium coach
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Reefi helps you take better care of your aquarium with smart tools, clear insights, and helpful reminders. Track your water parameters, manage maintenance tasks, and stay on top of dosing schedules for both freshwater and saltwater aquariums. Reefi keeps everything organized in one clear dashboard, so you always know how your tank is doing. Manage your aquarium inhabitants by keeping an overview of fish, corals, and other livestock. Log health observations, track changes over time, and use the journal to note important events like new additions, issues, or adjustments. Reefi helps you spot patterns early and maintain a healthy ecosystem. Keep track of your equipment, such as filters, lights, heaters, and pumps. Log setup details, maintenance history, and replacements so you never lose track of what’s running in your tank. Key features: • Log and track water parameters • Maintenance tasks with reminders • Dosing calculator and planning • Inhabitant management and health logs • Aquarium journal for observations and events • Equipment tracking and maintenance • Smart insights for healthier tanks • AI-powered aquarium coach • Support for freshwater and saltwater aquariums Whether you’re a beginner or an experienced aquarist, Reefi helps you care for your aquarium with confidence. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.reefi-app.com/privacy-policy-reefi/
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Aquarist's Notes | Reefi |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 6 days — better | Every 10 days |
| Ads | No — better | Yes |
| In-app purchases | Yes | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, Mac | iPhone, iPad, iPod |
| Requires iOS | 16.4 | 15.1 — better |
| Further details — not scored | ||
| Size | 16 MB | 65 MB |
| Age rating | 4+ | 4+ |
| Developer | Ludek Slouf | Tibbe Naarding |
In-app purchases
Aquarist's Notes
- Monthly subscription7 Days trial$1.991 Month
- Annual subscription1 Month trial$9.991 Year
Reefi
- Reefi Pro Weekly3 Days trial$3.997 Days
- Reefi Pro Monthly$9.991 Month
- Reefi Pro Annual3 Days trial$79.991 Year








