What's New

Minor improvements and bug fixes.

App Description

Refracto is a user friendly tool for homebrewers that will help you to convert your refractometer measurements during a fermentation process from °Brix to °Plato and SG. 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 in °Plato and SG
- Apparent final gravity in °Plato and SG
- Apparent attenuation
- Alcohol by volume

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

- Standard
- Linear formula according Petr Novotný
- Quadratic formula according Petr Novotný
- 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 50 °Bx.

iPhone Screenshots

(click to enlarge)

Refracto screenshot 1 Refracto screenshot 2 Refracto screenshot 3 Refracto screenshot 4 Refracto screenshot 5

iPad Screenshots

(click to enlarge)

Refracto screenshot 6 Refracto screenshot 7 Refracto screenshot 8 Refracto screenshot 9 Refracto screenshot 10

App Changes

  • January 29, 2015 Initial release
  • May 11, 2015 New version 1.1.0
  • June 17, 2015 Price increase: $0.99 -> $1.99
  • June 22, 2015 Price decrease: $1.99 -> $0.99
  • September 21, 2015 New version 1.2
  • February 08, 2016 New version 1.2.1
  • November 09, 2016 New version 1.3.0
  • June 14, 2019 New version 1.4.2
  • October 03, 2019 New version 1.4.3
  • August 06, 2021 New version 2.0
  • September 16, 2023 New version 2.0.1
  • September 16, 2023 Price increase: $0.99 -> $1.99