Reef Journal is a simple tool to help the saltwater aquarist track their water quality measurements. It includes a customizable list of parameters to track, showing only the ones you care to track. It also allows selecting from different units of measure for several parameters.

Entering a new measurement is as easy as can be.

1. Pick the date
2. Swipe around the data entry wheel to the desired value
3. There is no step 3!

The Parameters Reef Journal can track:
• Temperature
• Salinity
• pH
• Alkalinity
• Calcium
• Magnesium
• Strontium
• Potassium
• Ammonia
• Nitrite
• Nitrate
• Phosphate

Forget writing down the results from your test kits, just pull out your phone and enter them into Reef Journal.

What’s New

Version 1.5

- Support for new iOS devices and iOS versions

Ratings and Reviews

4.3 out of 5
3 Ratings

3 Ratings

Jdharding24 ,

Functional and elegant design!!!

This app is an absolute must have for any marine aquarium hobbyist! The interface is very intuitive and does an exceptional job in keeping tank water chemistry parameters organized. It's great for beginners who are trying to reach that stable butter zone but it will also be invaluable for more advanced hobbyists who need to keep on top of minuscule adjustments for the sake of sensitive fish or corals. Extremely convenient and worth every penny!

Dirty Mike and the Boys!!!! ,

Mediocre App - Serves its purpose

The app is very convenient; however, could use some enhancements to make it more user friendly. Some of the dials are very sensitive and the graphs are hard to read. You should be able to flip between a matrix and the graph to see past readings.

App Privacy

The developer, Epic Kiwi, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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