Works great
After the bug fixes, it works as it should. Should be a handy tool.
Only EL34 option
When you try to select another tube type you are taken to an empty screen. When you select cancel, the app crashes. Great idea, though.

Calculate bias for tube amplifiers with support for a wide range of tube types. Offers preset bias percentages for Class A and Class AB amplifiers.
1.1
August 22, 2012
Bugfixes
BiasCalculator is a tool designed to help users calculate the correct bias settings for their tube amplifiers. It supports a comprehensive list of tube types and provides common bias percentages for Class A and Class AB amplifier configurations.
BiasCalculator is a paid application, available for a one-time purchase of $0.99. This grants you full access to its features without any recurring fees.
BiasCalculator supports a wide array of tube types, including EL84, 6K6GT, 6V6, 6V6GTA, 6L6, 6L6GC, 6L6WGB, 5881, EL34, 5763, 7189, 7591, KT66, KT88, 7027, 6CA7, and 6BQ5.
Yes, BiasCalculator offers specific bias percentages for different amplifier classes. It includes a setting for Amp Class AB at 70% and Amp Class A at 90%.
BiasCalculator is available on mobile devices. It has an age rating of 4+, indicating it is suitable for a broad audience.
BiasCalculator was last updated on August 22, 2012, to version 1.1. The initial release date was August 13, 2012.
BiasCalculator has a rating of 4.0 stars, based on a single review. This indicates a generally positive reception from its users.
Based on the provided information, there is no indication that BiasCalculator contains advertisements. It is a paid application, suggesting a focus on user experience without ad interruptions.