And 400,000 are actively using the firm's tools each month.
Cross-platform tools provider Unity has boosted its offerings lately, most recently teaming Microsoft for Windows Phone 8.
Although supporting consoles and PCs in addition to mobiles, the company is focused on the latter and has added vibrating Immersion Haptics to its SDK, promised Tizen OS support and made mobile tools free.
So, it's perhaps little surprise that Unity now boasts two million registered developers, which comes following passing the hallowed one million milestone just over a year ago.
400,000 devs are actively using Unity's tools on a monthly basis, and the seven-year-old firm claims its greed-free approach to offering an array of tools is responsible for the success.
North America and Europe continue to adopt the solutions, while Asia, Latin America and Russia are also providing increasing usage.
David Helgason, CEO and co-founder, Unity Technologies, said: "In 2005 we started out with a few hundred users and the goal of making game development accessible to everyone across an increasing array of platforms and devices.
"We continue to dream big and innovate for our developers. We can’t wait to shed more light on our new initiatives and plans at this year’s Unite conference in Vancouver."
Unity is offering a full development suite that comprises all add-ons for iOS, Android and BlackBerry 10 to mark the milestone.