Spider-Man and His Amazing Friends (1981) was produced at the same time as this show, albeit with a different voice actor as Spidey and most of the other characters. The two shows even premiered on the exact same date.
This series takes place in the Earth-8107 version of the Marvel Comics multiverse, together with Spider-Man and His Amazing Friends (1981) and The Incredible Hulk (1982).
While Amazing Friends is more widely recognized for its guest-stars, Spider-Man managed to sneak in its own cameos. This included a cartoon based on the Avengers shown on a television screen and a store called Stan's Costume Shop which featured numerous Marvel characters.
Toei acquired a license to produce Marvel-based content in Japan in the late 1970s/early 1980s resulting in TV series like Spider-Man and super sentai as well as animated films based on Dracula and Frankenstein's Monster. However, with this Spider-Man animated series, Toei began producing Marvel content for an American audience. Beginning with the concurrent series Spider-Man and his Amazing Friends, Toei largely took over animation duties on Marvel Productions.
The show was originally pitched to NBC. After NBC executives pitched and tested the series, the network rejected it in favor of Spider-Man and His Amazing Friends (1981), a show that was designed to meet the requirements of a typical Saturday morning network cartoon.