Apple CEO Tim Cook has branded the forthcoming biopic about the late technology guru Steve Jobs as "opportunistic", saying he does not even recognise the character portrayed on the big screen. During an appearance on The Late Show With Stephen Colbert, Cook said he did not approve of the "unflattering" and dark portrayal of his predecessor by Michael Fassbender in forthcoming Danny Boyle biopic Steve Jobs.

He also slammed the documentary Steve Jobs: The Man In The Machine, which is due for a limited release in US cinemas later in September. "The Steve I knew was an amazing human being. He's someone that you wanted to do your best work for," Cook said.

"He had this uncanny ability to see around the corner and describe the future – not an evolutionary future but a revolutionary future. He was a joy to work with and I love him dearly, I miss him every day. I think that a lot of people are trying to be opportunistic and I hate that, it's not a great part of our world."

According to the site, the film is "set backstage at three iconic product launches and ends in 1998 with the unveiling of the iMac" and focuses more on Jobs as an egomaniac with difficult relationships, rather than the technological innovations he is known for. Some fans compared the atmosphere to that of 2010's The Social Network.

Cook's scathing remarks come days after Apple's co-founder Steve Wozniak, who acted as a consultant on the project, said he was "shocked and amazed" by the film.

"The film-makers have done an award-winning job. The acting was just so realistic," he told the BBC. "In some prior movies, I saw [the actors] simulating Steve Jobs, but they didn't really make me feel like I was in his head understanding what was going on inside of him – his personality. This movie absolutely accomplishes that, and it's due to great acting, which obviously comes from great directing."

Earlier in September, Wozniak surprised fans of the technology giant when he revealed that although his partnership with Jobs was pivotal in creating the business, Jobs had no role in the design of early Apple computers as he "did not know technology".

During three interviews with Reach a Student, a website designed to provide resources to pupils at Windemere Prep in Orlando, Florida, Wozniak said: "The Apple II computer, by the way, was the only successful product Apple had for its first 10 years, and it was all done for my reasons for myself, before Steve Jobs even knew it existed."

Steve Jobs will open in UK cinemas on 13 November.