ReefGuy : Saltwater Tank
Reef · Marine · ICP
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
New in ReefGuy: Create custom reminders with flexible dates and repeat intervals. Never miss important aquarium maintenance tasks again!
ReefGuy – Your Personal Reef Assistant
A saltwater aquarium is about more than individual measurements. ReefGuy helps you monitor your reef, understand trends, and simplify everyday aquarium care.
Water parameters, livestock, dosing, ICP tests, tasks, and backups – all organized in one place.
**TRACK YOUR WATER PARAMETERS**
Record measurements and follow their development with clear, easy-to-read charts. ReefGuy supports alkalinity (KH), calcium, magnesium, nitrate, phosphate, temperature, and salinity.
Water changes, maintenance, and livestock additions are displayed alongside your measurements, making it easier to understand changes over time.
**REEF SCORE**
The Reef Score combines water parameters, stability, maintenance, and available data into a clear overview of your aquarium's current condition.
**DOSING MADE EASY**
The integrated dosing calculator supports products from various manufacturers and helps calculate starting doses and necessary adjustments.
Create dosing schedules and distribute daily amounts across multiple doses and times. ReefGuy can also calculate alkalinity, calcium, and magnesium consumption from your recorded measurements.
**MANAGE AND ANALYZE ICP TESTS**
Import ICP reports and keep them organized with your aquarium.
ReefGuy can automatically analyze supported ICP reports and prepare detected values for your review, reducing manual data entry.
**PRACTICAL REEF TOOLS**
Calculate water changes, adjust salinity and salt quantities, or determine necessary nitrate and phosphate corrections.
Calculations are tailored to your aquarium's configured water volume.
**ORGANIZE YOUR LIVESTOCK**
Manage fish, corals, and other aquarium inhabitants. Add notes, photos, and documents to keep important information accessible.
**TASKS AND REMINDERS**
Schedule recurring maintenance and receive reminders for water testing, water changes, and your own aquarium care routines.
**LOCAL BACKUPS**
Export your ReefGuy data to a backup file and restore it whenever needed. Your aquarium data is managed locally on your device.
**REEFGUY CLOUD – ONE ACCOUNT FOR YOUR DEVICES**
With ReefGuy Cloud, you can also back up your aquarium data online and restore it on another device.
Sign in using your email address and a verification code – no password required.
Your benefits:
- Create cloud backups manually
- Store aquarium data online
- Restore data after changing devices or reinstalling the app
- Use one cloud account across multiple devices
- Easy, passwordless email sign-in
ReefGuy Cloud is included with an active, paid annual subscription and requires an internet connection.
**FROM NANO REEFS TO REEF XXL**
Whether you have a small nano reef or a large saltwater aquarium, ReefGuy adapts to your setup and brings essential aquarium tools together in one app.
**MORE KNOWLEDGE. HEALTHIER REEFS.**
ReefGuy was developed for aquarists who want to do more than maintain their reefs – they want to understand them.
Less guesswork, better insights, and more time for what really matters: your reef.
Terms of Use (EULA):
https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy:
https://reefguy.app/datenschutz.html
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
**ReefGuy is getting even more powerful and customizable!**
This update introduces several new features and improvements:
- **New Reef Health Monitor:** Keep track of your aquarium's health and stability. ReefGuy analyzes water parameters, detects irregularities, and highlights areas that may need attention.
- **Customizable Dashboard:** Personalize your home screen and choose which water parameters and information you want to display.
- **Custom Reminders:** Create your own tasks and reminders with flexible dates and recurring intervals.
- **Improved Planner:** Easily keep track of upcoming measurements, water changes, maintenance tasks, and other activities.
- **Optimized Notifications:** Reminders are managed more reliably and automatically rescheduled after restoring a backup.
- **Improved Backup System:** Custom reminders are now included in local and cloud backups.
- **Better User Experience:** Improved dialogs, clearer input fields, and numerous interface refinements.
We've also fixed several bugs and made additional improvements to app stability and performance.
The developer, Danny Schueler, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Danny Schueler
- Size
- 79 MB
- Category
- Utilities
- Compatibility
Requires iOS 15.5 or later.
- iPhone
Requires iOS 15.5 or later. - iPad
Requires iPadOS 15.5 or later. - iPod touch
Requires iOS 15.5 or later. - Mac
Requires macOS 12.4 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- German
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- ReefGuy Premium $17.99
- Copyright
- © 2026 Schueler IS