Suggest good employee comms app?

Hey all,
I need good employee communication software for my team. Remote + office mix, want easy chat, alerts, safe data.

Saw this list – 5 Best Employee Communications Software for Enterprise

Anyone use these? Or got better? Want real feedback.
Main things – secure, simple, works on phone + desktop, not too costly.

Drop your picks pls. Thanks!

Hello Kathrin,

Hope you are well!

I would like to explore the opportunity to connect with you and discuss the possibility of joining your software development team. Would it be possible to continue this conversation via email or WhatsApp at your convenience?

Thanks!

what kind of software do you suggest?