The app can be downloaded onto smartphones, and features the latest news and events from the festival, which runs throughout July.
To mark its launch the Mayor of Dudley, Councillor Steve Waltho, visited the home of Freecom Internet Services Ltd at the Waterfront, in Brierley Hill, where the app was created.
Mike Geer, who runs the company, offered to create the app free of charge to support the festival.
He said: "We approached the community organisers from last year's festival and offered to support them with the creation of the app.
"We're really pleased with how it's turned out and hope thousands of local people will download it for free and get involved with the festival. Dudley Council have supported the festival so we thought it was right the mayor should come down and officially launch the app."
Councillor Waltho said:"It's always a pleasure to visit local businesses and see the fantastic work that is taking place.
"The staff at Freecom have been great and it's a tremendous gesture they have created the app free of charge."
Steve Edwards, chairman of the Black Country Festival Community Group, said: "The app gives everyone easy access to the festival via their mobile phones.
"We're really grateful to Freecom for all their work and we're confident loads of people across the Black Country will be downloading the app." The festival's packed programme includes a Black Country Beer Day, a Black Country 10km run and a variety of sports events scheduled on dates throughout July to celebrate Black Country Day on July 14.
Halesowen Carnival returns this Saturday from 12pm to 7pm at Highfield Park after an absence of around 30 years.
Also on that day is the Kingswinford Hockey Club Junior Hockey Festival at the Dell Stadium, in Bryce Road, Pensnett from 10.30am. The Black Country Volleyball tournament takes place on Saturday from 10am at King Georges playing fields within Sandwell Valley.
Bilston Music and Arts Festival is on Saturday at South Wolverhampton and Bilston Academy. The Black Country Fun Run is in Halesowen town centre this Sunday alongside the Stourbridge Carnival.