[gregd]

This is directly from Martin (developer of Bootstrap Studio and Mail Studio):

"You will notice that Mail Studio has a different pricing model - it is subscription based. This is necessary because the app depends on a lot of cloud features like cloud saves, sending email previews and syncing with email providers, which are not possible to provide with a one-time purchase."

I bought and paid for a lifetime license to Bootstrap Studio and I absolutely LOVE that product.