Post one announcement to every community you run.
WA Poster runs on your own computer. Pick a saved message, tick your communities, check how it will look in the chat, and it posts to each one in turn.
It uses an unofficial WhatsApp connection, so your number can be banned. Read the safety notes before you start.
What it does
Saves your routine
Keep every reminder, poll and pitch in one list. Import them from a spreadsheet, or write them in the app.
Shows the chat first
The preview looks like a WhatsApp chat, with bold, links and image captions as members will see them.
Sends at a human pace
One community at a time with a random gap you set, and small variations so the copies are not identical.
Stays with you
Your messages, images and WhatsApp login stay in the project folder on your computer. There is no cloud account.