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 1.4.2

Added support for the latest devices and iOS 12.

Ratings and Reviews

Superchop728 ,

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.

Sandwich makers ,


Thanks for making it easy to make these calculation.

FapFapFap1 ,

Only goes to 32 brix

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


Michael Schmidt
1.5 MB
Requires iOS 11.4 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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