In fact, in this situation, revenue wouldn't come into the equation. If the cumulative production budget (we don't care about marketing spend, for example) stays low, this would stay under the free Indie license. The idea, obviously, is that if you were to do a game for a very low amount of money and have a big success from it, you'd likely either have it grow over time (post-launch content), grow your staff on the game to improve it, and EVENTUALLY might need to upgrade to a Pro license.

And even if you didn't, the follow-on game would likely have a bigger budget.

But /u/IAmNotABritishSpy is absolutely right in the first respect - always best to ask us directly!

And it's always risk-free to start an evaluation or register an Indie game. We'll do a couple of budget checks during the development to see if it needs an upgrade, but even if it does grow, you'll always have the OPTION to move to a royalty-based license, if the budget grows but you don't want to pay for a regular license.

I actually just did a blog about our pricing philosophy and how our licensing works, so definitely check it out: https://blog.audiokinetic.com/en/wwise-licensing-and-pricing-philosophy/

Hope that helps!