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SpindleHorse, doing business as SpindleHorse Toons, is an American independent animation studio founded by Vivienne Medrano in 2018, based in Burbank, California. It is responsible for the Hellaverse shared universe animated series, whose main series Hazbin Hotel is co-animated with Bento Box Entertainment and co-produced with A24. It was the sole animation studio of its spin-off series, Helluva Boss until 2025, when Amazon Prime offered to co-produce Helluva Boss.
SpindleHorse has also produced several animated shorts, including Holidaze and Bad Luck Jack, all of which are available on Medrano's YouTube channel. Medrano has stated that the company's name comes from a childhood character of hers named Spindle.
In October 2019, the pilot episode of Hazbin Hotel was released on Medrano's YouTube channel. In November 2019, the pilot episode of Helluva Boss was released to her YouTube channel as well. On December 25, 2019, a short entitled "Holidaze" was released. In July 2020, Medrano released an animated music video for Hazbin Hotel called "Addict", featuring the Silva Hound song of the same name. In August 2020, Hazbin Hotel was picked up for a full series by A24. Animation Magazine said that A24 was taking a "bold step" by picking up the series. In 2023, scholar Ben Mitchell described Medrano's Hazbin Hotel and Helluva Boss as series which were "sensationally popular" and an effective use of Patreon to subsidize the show's art "through monthly tiered payments". Hazbin Hotel would go on to be released in January 2024 to critical acclaim.
On September 30, 2020, Medrano released an animated short film titled "Bad Luck Jack", based on her webcomic ZooPhobia. The short was nominated for and won for a Ursa Major Award in the "Best Dramatic Short Work" category. The short was also listed as a "Recommended Anthropomorphic Dramatic Short Work" on the Ursa Major Award website. From 2020 to 2021, Medrano released several "Voxtagram" animated clips of the characters of Hazbin Hotel and Helluva Boss in a crossover slice-of-life setting to a series of in-character Instagram accounts run by SpindleHorse employees, alongside normal posts of character art depicting characters' .
In August 2025, Medrano announced the creation of an Australian division of SpindleHorse, called SpindleRoo. Its first production was a pilot for an animated adaptation of the webcomic Homestuck. It was the first SpindleHorse project not built around Medrano's stories or characters. She expressed her excitement for this project to Polygon in a September 2025 interview, saying it will be "very experimental" and called it a "test pilot" for many aspects, including "the studio, the process, a new style, and a new technology," adding that audience reaction will determine whether studios are interested in developing it into a full animated series, or if it will be continued on her YouTube channel. She also told the publication that she hoped that the project would open the door for SpindleHorse working with other creators and "more original projects", to support other voices apart from her own ideas.
| "Pilot"/"That's Entertainment" | 2019 | YouTube | Hazbin Hotel pilot | |
| Helluva Boss | 2019–present | YouTube Amazon Prime Video | ||
| Hazbin Hotel | 2024–present | Amazon Prime Video | Co-production with Bento Box and A24 |
| Homestuck - The Animated Pilot | 2025 | YouTube | Pilot, under SpindleRoo |
| "Oh Millie" | 2020 | YouTube | |
| "Addict" | |||
| "Just Look My Way" | 2023 | ||
| "Polkamania!" ("Vampire" segment) | 2024 | ||
| "Everything Is Fine (Remix)" ( Helluva Boss segment) | 2025 |
| "Holidaze" | 2019 | YouTube | |
| ZooPhobia | 2020 | ||
| Helluva Shorts | 2024–present |
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