Refracto is a user friendly tool for homebrewers that will help you to convert your refractometer measurements during a fermentation process from °Brix to SG or °Plato. It automatically compensates the alcohol effect during fermentation of your beer.

To use Refracto simply swipe to enter your original refractometer reading (from before fermentation) and the result of a current measurement. Refracto then immediately computes the following values:

- Original gravity
- Final gravity (apparent and actual)
- Attenuation (apparent and real)
- Alcohol by volume

At any time you can switch between four different modes of computation:

- Standard
- Kleier (a modernized version of the Standard formula)
- Linear formula according Sean Terrill
- Cubic formula according Sean Terrill

Please note:

- In addition to this App you will also need a Refractometer with a Brix-scale.
- The supported input range for refractometer readings is 0 to 32 °Bx.

What's New

Version 1.4.1

This release contains minor UI improvements and bug fixes.

Ratings and Reviews

Works great


This app works really good and I’m taking small samples with a pipette to get a gravity number with a digital refractometer I quickly do the calculation and I’m only using 5 mL of beer.

Only goes to 32 brix


Starting OG cannot be more than 32 brix. Everything I make starts higher than that. Unusable.

Easy Peasy


This is the easiest refractometer calculator I've found online. It auto-compensates for fermentation and seems pretty accurate when compared to the others. I like how all the relevant results show up at the top, no scrolling down or re-entering info to get more. This is the one I'll be using from now on.


Michael Schmidt
1.7 MB
Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.
English, German
Age Rating
You must be at least 17 years old to download this app.
Frequent/Intense Alcohol, Tobacco, or Drug Use or References
© Michael Schmidt


  • Family Sharing

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

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