The free, downloadable app called FlyRights lets travellers instantly send their concerns to the US Transportation Security Administration, which would then respond through its own channels.
Launched ahead of Thanksgiving, one of the busiest travel periods in the United States, the updated "FlyRights 2.0" also allows passengers to send copies of their complaints to their members of Congress, and it features maps that show which airports have the most troubling records.
An initial version of FlyRights has been downloaded 18,000 times since it was launched in April 2012, according to the Sikh Coalition, the advocacy group that released the app.
"Until that happens, we call on the public to hold the TSA accountable by downloading and using FlyRights," Singh said.
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Singh addressed a news conference that included rights activists for African Americans and people with disabilities, who said that they also found the app useful to address concerns about profiling.
"The rights of every individual deserve to be protected, and they can be protected. And we can be safe without violating the rights of individuals," said Wade Henderson, president of The Leadership Conference on Civil and Human Rights.
Sikhs in the United States have faced a wave of violence since the September 11, 2001 attacks, with assailants sometimes falsely believing they are radical Muslims. In the worst incident, a white supremacist shot dead six Sikhs after barging into their temple in Wisconsin in August 2012.
Singh said that the Sikh Coalition hoped eventually to expand FlyRights beyond airports to include schools, where Sikh children report widespread bullying, and other areas.