# ReefGuy : Saltwater Tank — Reef · Marine · ICP

> Reef · Marine · ICP (iPhone/iPad app by Danny Schueler.)

- Source: https://appshunter.io/ios/app/reefguy-saltwater-tank/id6811942133 (this page in markdown: same URL + `.md`)
- Developer: [Danny Schueler](https://appshunter.io/developer/1876819344)
- Category: Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.5 · 72 MB
- Languages: German (Germany)
- Released: 2026-10-14
- Data updated: 2026-10-15

## What is ReefGuy?

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

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| ReefGuy Premium | $17.99 | per year |


## Is ReefGuy safe?

Not enough ratings yet to assess ReefGuy.

## Is ReefGuy legit?

ReefGuy : Saltwater Tank has limited verification signals. The AppsHunter Legitimacy Score for ReefGuy is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 5 releases)

### 1.6.0 — 2026-10-15

**What's New in This Version**

ReefGuy is going international! The app is now fully available in English as well as German.

**ReefGuy Cloud**
- Securely store your aquarium data in the cloud
- Create and restore cloud backups manually
- Transfer your data to a new device
- Use one cloud account across multiple devices
- Easy, passwordless sign-in with an email verification code

**Additional Improvements**
- Improved cloud sign-in and subscription verification
- Clearer error messages in English and German
- Stability and usability improvements

More knowledge. Healthier reefs.

### 1.5.0 — 2026-10-12

-ReefGuy Cloud: Sichere deine Aquariendaten und stelle sie auf anderen Geräten wieder her.

-Ein Konto für alle Geräte: Nutze ReefGuy auf iPhone und Android mit demselben Cloud-Konto.
-Einfache Anmeldung: Bequem per E-Mail-Freischaltcode, ganz ohne Passwort.
-Mehr Sicherheit: Verbesserter Schutz vor versehentlichem Überschreiben deiner Cloud-Backups.
-Optimierte Bedienung: Verständlichere Hinweise, übersichtlichere Abo-Informationen und verbesserte Benutzerführung.
-Fehlerbehebungen und Stabilitätsverbesserungen.

### 1.4.2 — 2026-10-09

Bug fixes

### 1.4.1 — 2026-10-07

• Neuer ReefGuy Assistent mit individuellen Hinweisen zu deinen Wasserwerten, Trends und anstehenden Aufgaben
• Verbesserter Reef Score für eine realistischere Bewertung deines Riffs
• Optimierte Verbrauchs- und Dosierberechnung
• Verbesserte ICP-Verwaltung und Datensicherung
• Zahlreiche Detailverbesserungen und Fehlerbehebungen für mehr Stabilität

### 1.3.9 — 2026-10-04

No release notes.

## More apps by Danny Schueler

- [RevierMap](https://appshunter.io/ios/app/reviermap/id6759093605)

All apps by Danny Schueler: https://appshunter.io/developer/1876819344

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-15.*