The elevator at SEPTA’s 8th and Market station didn’t work for more than a month.

Civic hacker James Tyack noticed.

Tyack, a software developer at King of Prussia-based Health Market Science, pays attention to accessibility issues, as NBC10 reported. It’s why he built Unlock Philly, an app that shows the SEPTA subway and high-speed line stops that are wheelchair-accessible and have elevators.