Can we start if each department already uses a different chat tool?
Yes. INARY is free to start with unlimited members, so you can begin by moving only the threads that need cross-team work into INARY and inviting the people involved.

Sales knows the sales side, production knows the production side, and everything in between is a question waiting for an answer. In INARY, the AI sits inside the cross-team thread and answers with the context already in hand.
Companies where cross-team collaboration struggles have one thing in common: information is locked inside each department. Sales does not know why the delivery date moved. Production does not know how the customer feels. So people schedule meetings, send emails, and wait. The real cause is not friction between people. It is where the information lives.
In INARY, each project gets a thread that crosses department lines. Sales, production, and operations share it, and the history, the decisions, and the numbers stay there. Anyone who joins later can read the thread and catch up. "What happened with that?" gets asked less often.
Here is the difference. INARY's AI is inside the thread. It knows what was discussed and what was decided. Ask it to summarize why the deadline moved, or to explain production's concerns in language sales can use, and it answers with the thread as its premise. A personal AI assistant cannot do this, because the context of the discussion is not in it.
The answer appears in the same thread, and everyone reads it right there. Nobody has to paste it in, and nobody has to ask where it came from.
Fewer meetings and emails whose only purpose is confirmation. The AI lays out each department's position on the same page, so the discussion moves from who is right to what to do next. People who join a project later get up to speed faster. Collaboration speeds up on its own once information moves from people to a shared place.
Yes. INARY is free to start with unlimited members, so you can begin by moving only the threads that need cross-team work into INARY and inviting the people involved.
The AI works from what is discussed in the thread it is in. It does not read conversations of members who are not in that thread.
AI usage is billed by what you actually use, and an administrator can set a cap. There is no per-seat AI fee.