ChipRef is a free Android application developed by Mike Redrobe that helps you check the pinouts and characteristics of many common ICs. The program is designed for those who work with ATmega and ATTiny series chips used in Arduino and Trinket, respectively. With ChipRef, you can easily access external links to PDF datasheets without internet access.

The app is user-friendly and straightforward, allowing you to find the information you need quickly. The information provided is relevant and accurate, making it a handy tool for professionals and hobbyists alike. Additionally, ChipRef provides a Twitter handle, @mikered, which can be used to stay updated on the latest developments and updates. Overall, ChipRef is a must-have tool for anyone working with common ICs, and it's free!