Even at first sight, GLOW and Orange is the New Black share more than a few similarities. Both series are produced by Netflix, have large ensemble, female-led casts, and are inspired by true stories.
Orange is the New Black is an adaptation of Piper Kerman's account of the year she has spent in a federal women's prison; GLOW is based on the wrestling promotion of the same name, which debuted back in 1986.
The most important link concerns the production and behind-the-scenes personnel. Jenji Kohan and Tara Herrmann are the executive producers of both shows, with Kohan herself the creator of Orange is the New Black. Carly Mensch also works on OITNB as a producer and writer, and is the co-creator and showrunner of GLOW alongside Liz Flahive (Homeland).
Prison and wrestling don't seem to have very much in common, yet both shows are also very much alike. They are funny, touching, greatly written, and filled with enough interesting characters to remain the mainstay of the streaming service for years to come.
Technically, OITNB already is, but GLOW can reach that level as well.