The 俺の電工1種 - 第一種電気工事士の筆記試験アプリ is an educational app designed to help users prepare for the first class electrician's written exam. Developed by Keiichi Yamaguchi, this app contains a comprehensive collection of 750 exam questions from the past 13 years, including the additional test questions.

The app features a simple quiz-like interface that allows users to test their knowledge and assess their performance with a pass/fail rating system. It also offers practice exercises on various categories such as basic theory and wiring diagrams. The app allows users to pause and resume their test, making it convenient for them to take the test even during their short breaks. Additionally, the app keeps track of the user's performance by recording the number of correct and incorrect answers for each question, which helps users identify their weak spots. The app also supports Game Center, which allows users to unlock achievements while taking the test.