[r00fus]

There's "added content/DLC", then there's "freemium". My hint: look for tokens/credits for purchase. If you see that, avoid the app. I could love the concept or see it as great for my kids but as soon as I'm "buying tokens" I realize it's been engineered to get my money and not deliver a solid product for a fixed price.

The "added content/DLC" model works well for me - I love games/apps like Carcasonne, Ascension, or 123 Color where you buy expansions or additional patterns. But again, most of these types of apps aren't free to begin with.