Only facts Mesa ships: QR or Cloud API, kwacha/MoMo, 0% campaign markup, Status, orders, widget. Not a clone of their marketplace.
Wati is a Meta-centric inbox sold in USD. Mesa is a Zambian workspace: pair with QR or Cloud API, bill in kwacha, and run Status, orders and MoMo on the same number.
Twilio is a developer messaging API billed in USD. Mesa exposes a REST API too — and ships the inbox, CRM, bot and campaigns so a shop does not have to build them.
Gallabox is another WhatsApp suite. Mesa’s difference is local rails: kwacha, MoMo, Status, QR pairing, and campaigns that do not add a surcharge on Meta’s fee.