Complexly is an American online video and audio production company, based in Missoula, Montana, and Indianapolis, Indiana.

Its founders are brothers John and Hank Green (who acted as CEO until late 2023), who began their Vlogbrothers YouTube channel in 2007.

[3] Originally named EcoGeek LLC, it was founded by Hank Green to support his blog on environmental and science issues and was renamed in 2016.

[19] A podcast, SciShow Tangents, was launched in November 2018; it features entertaining exchanges of scientific facts among many of the shows' staffers, and is directed at a mature audience.

[20] Host: Jessi Knudsen Castañeda Co-host: Anthony Brown (since end of hiatus) SciShow Kids is a YouTube channel dedicated to science news and topics of interest to grade-school-aged children.

Initially oriented around 'assignments' given by noted artists to the audience to complete, it has gradually shifted its emphasis to discuss contemporary art in a broader sense.

Hosts: Blake di Pastino, Kallie Moore, Michelle Barboza-Ramirez (since 2021); formerly Hank Green Eons is a PBS Digital Studios co-production amd is a channel about the evolutionary history of life on Earth.

Hosts: Hank Green, Deboki Chakravarti (since 2021) Journey to the Microcosmos presents the living collections of microbiologist James Weiss to give a close-up look of microscopic life.

Host: Various Ours Poetica captures the intimate experience of holding a poem in your hands and listening as it is read by a distinctive voice.

In November 2018, Complexly fully launched a co-production arrangement with WNYC Studios for three regular podcasts; two had been produced independently before, one was new (but adapted from an old format).

The channel enjoyed remarkable success and in a matter of months had caught the attention of staffers at the Field Museum in Chicago; Graslie and the program moved there in August 2013.

After a period where the Field licensed the program from Green, they eventually purchased all its rights and trademarks; they produced the show in-house until it was wrapped up in 2020.

[25] Host: various Holy Fucking Science was a science-based entertainment show where four people (typically SciShow staffers, and guests) get together to try to astound and amaze each other with scientific facts and discoveries; it was directed at adults only.

The show ceased in March 2018 after 58 episodes, with the promise of a similar production to soon replace it;[26] SciShow Tangents took its place in November 2018.