Arts and Entertainment Is Toon Boom Harmony a one time purchase? Is Toon Boom Harmony a one time purchase? When a new version of the product is available, you can obtain it at no extra cost as long as you maintain your subscription. Perpetual License: This type of license incurs a single one-time fee. How long is the Toon Boom Free Trial? 21 days Related Posts:Is Toon Boom a one time payment?Can Toon World be destroyed?What do I need for a boom mic?Is Toon Boom storyboard Pro free?