About True Proof
True Proof calculates the true proof of a water-alcohol mixture at a reference temperature, using the measured apparent proof from a hydrometer reading and the temperature at the time of the reading. True Proof also...
True Proof calculates the true proof of a water-alcohol mixture at a reference temperature, using the measured apparent proof from a hydrometer reading and the temperature at the time of the reading. True Proof also performs gauging calculations, and can calculate dilutions taking full account of the temperature-dependent nonideal mixing of water and alcohol. Calculations are logged, and may be annotated and emailed for archiving. Multiple units support large-scale distillers and hobby-scale distillers alike, in the US and abroad: concentration measurement in proof, ABV, or density ; temperature in °F or °C; abundance in US gallon, liter, pound, kg, US ton, or metric tonne, etc. The reference temperature can be selected for US (60ºF) or international (20ºC), or any other value in the range [-20ºC,40ºC]. The instrument thermal expansivity can be selected, which enables application to vibrating tube densitometers in addition to hydrometers. Two separate computational models are employed - one based on the (US) TTB gauging manual, and one based on OIML (UK, EU, Canada, etc) data. The computer model is limited in temperature and proof range to that spanned by government standard tables.
Version History Quelque chose pour nos amis Seychellois - enable use of comma as decimal separator. Also bug fix, improved keyboard dismissal, change color scheme for dark mode compatibility. 2.40 10/18/2020 Quelque chose pour nos amis Seychellois - enable use of comma as decimal separator. Also bug fix and improved keyboard dismissal. 2.35 10/16/2020 When gauging by weight, volume is estimated in gallons and liters, provided the gauging proof corresponds to the last proof calculated in the proofing calculation. Improved consistency checking. 2.31 04/03/2019 Improved bounds checking, and a fix for buggy behavior near the edge of the TTB table. When gauging by weight, the fluid volume is calculated. 2.3 04/02/2019 bug fix re: ios11.2 2.2 02/27/2018 This new release includes event logging. Up to 100 recent proofing, gauging, and dilution calculations are logged, and may be annotated and emailed to facilitate paper-free distillery management. 2.1 04/02/2017 Screenshots updated, and some imperial volume units added 2.0.1 03/16/2017 True Proof now fully supports both TTB (US) and OIML (including Canada, EU, UK) standards. Calculations include correction of measured proof/ABV for temperature effects, calculation of proof gallons and liters of absolute alcohol, of dilutions. 2.0 03/13/2017 Minor bug fix in temperature correction factors 1.1.1 03/12/2015 improved data persistence and keyboard behavior 1.1 10/06/2014 1 08/04/2014
Previous Versions
Here you can find the changelog of True Proof since it was posted on our website on 2023-07-04 22:41:02.
The latest version is 2.40 and it was updated on 2026-10-17 00:28:38. See below the changes in each version.
True Proof version 2.40
Updated At: 2026-10-14
Changes: Version History Quelque chose pour nos amis Seychellois - enable use of comma as decimal separator. Also bug fix, improved keyboard dismissal, change color scheme for dark mode compatibility. 2.40 10/18/2020 Quelque chose pour nos amis Seychellois - enable use of comma as decimal separator. Also bug fix and improved keyboard dismissal. 2.35 10/16/2020 When gauging by weight, volume is estimated in gallons and liters, provided the gauging proof corresponds to the last proof calculated in the proofing calculation. Improved consistency checking. 2.31 04/03/2019 Improved bounds checking, and a fix for buggy behavior near the edge of the TTB table. When gauging by weight, the fluid volume is calculated. 2.3 04/02/2019 bug fix re: ios11.2 2.2 02/27/2018 This new release includes event logging. Up to 100 recent proofing, gauging, and dilution calculations are logged, and may be annotated and emailed to facilitate paper-free distillery management. 2.1 04/02/2017 Screenshots updated, and some imperial volume units added 2.0.1 03/16/2017 True Proof now fully supports both TTB (US) and OIML (including Canada, EU, UK) standards. Calculations include correction of measured proof/ABV for temperature effects, calculation of proof gallons and liters of absolute alcohol, of dilutions. 2.0 03/13/2017 Minor bug fix in temperature correction factors 1.1.1 03/12/2015 improved data persistence and keyboard behavior 1.1 10/06/2014 1 08/04/2014
True Proof version 2.40
Updated At: 2020-10-18
Changes: Quelque chose pour nos amis Seychellois - enable use of comma as decimal separator. Also bug fix, improved keyboard dismissal, change color scheme for dark mode compatibility.
True Proof version 2.40
Updated At: 2020-10-18
Changes: Oct 18, 2020
Version 2.40
Quelque chose pour nos amis Seychellois - enable use of comma as decimal separator. Also bug fix, improved keyboard dismissal, change color scheme for dark mode compatibility.
Disclaimer
Official App Store Link
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