Klaviyo: Email Marketing & SMS

Great product, only they seemed to have stopped developing. Product hasn't had any new features lately, customer service is slow, but mainly the price is bothering me. Every extra 500 people in your account costs $25 a month extra... I first need to recoup my Klaviyo costs and then hope I can make some profit of the emails. I would have expected the costs to decrease relatively when getting more subscribers, but it's just linear.

Great potential, weak execution.