Three kinds of software
Three types of bulk WhatsApp software, judged from a Sharjah office
In a listing they look the same. The differences appear once volume climbs and more than one person needs access.
1 Installed programs
Software on a single Windows machine that operates WhatsApp Web with a personal SIM. Low cost at purchase, but the number is often blocked once sending speeds up.
2 Browser add-ons
A Chrome extension scripting WhatsApp Web in an open tab. It carries the installed program's risk, and sending stops when the lid closes or the browser restarts overnight.
3 Cloud platforms on Meta's API
Hosted software calling Meta's Cloud API from a server. It works from any browser, keeps running with every screen off, and is the type of software WappBlaster is.
4 Three questions for any vendor
Which route do messages take? Can several staff share one number with separate logins? Does a failed message show why? A vague answer to any of these is a warning sign.