Pricing by email volume, not contacts. Forecasting is a guess.
Brevo prices by emails-sent-per-month, not contacts on the list. Send a single big campaign to a 50K list and you're past most plan limits. Send small daily blasts to 5K and you're cheap. The model rewards low frequency and punishes engagement, so your budget moves every time your strategy does.
Mailsoftly: contact-based pricing. $49/mo at 5K, $79 at 15K, $159 at 30K. Predictable.