Founded by twin brothers Tom and Tony Cannon in 2011, the company has developed Stonehearth, a city-building game, which was released in July 2018 after three years in early access.

They were most recently employed as software engineers for VMware but quit their jobs in 2011 to develop video games full-time, founding Radiant in Los Altos, California.

[4][5] Stonehearth was made available in early access in June 2015 and released in July 2018, although many development goals from the Kickstarter campaign were left unfulfilled.

[6][7] In a June 2015 round of seed funding, Radiant raised $4.5 million from investors Andreessen Horowitz, London Venture Partners, and General Catalyst.

[12][13][14] On March 8, 2016, Radiant announced that it had been acquired by Riot Games, the developer of League of Legends, for an undisclosed sum.