Three kinds of software
PC program, extension or cloud: an Ahmedabad buyer's guide
They share a name in the listings and little else once you start sending.
1 Program on one PC
Installed on a single Windows computer in the office, it automates WhatsApp Web on a personal SIM. It is cheap to buy once, but the PC must stay on through each send, and the SIM tends to be banned as volumes rise.
2 Browser add-on
A Chrome extension that clicks and types inside WhatsApp Web. It follows the same unofficial path, so it carries the same ban risk, and it halts whenever the laptop sleeps or someone closes the tab.
3 Cloud software on Meta's API
Runs on servers linked to Meta's WhatsApp Business Platform, so no office machine needs to stay on. Each staff member logs in separately, and buyers see your verified business name. WappBlaster is built this way.