> ## Documentation Index
> Fetch the complete documentation index at: https://docs.linkiasoft.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Plans, usage and units

> What a unit is, what consumes one, and what happens when you run out.

**Plans & Billing** in the sidebar. Admins only.

## Units

Your plan includes a **shared monthly pool of units**. Two things draw from it:

* each **active contact**, and
* each **AI reply**.

One unit each. They share the same pool, so a month heavy on AI replies leaves less room
for contacts and vice versa.

## What your plan controls

| Limit                     | Effect when reached                                                                      |
| ------------------------- | ---------------------------------------------------------------------------------------- |
| **Units per month**       | Sending and AI replies stop                                                              |
| **Active contacts**       | Counts toward the same pool                                                              |
| **Max channels**          | Cannot connect another                                                                   |
| **Allowed channel types** | Some channel types unavailable                                                           |
| **Max users**             | Cannot add another — see [Working at the same time](/help/team/working-at-the-same-time) |

Feature flags decide whether **AI**, **campaigns**, **automations** and **calls** are
available at all. A greyed-out feature is a plan boundary, not a fault.

## Watching usage

The billing page shows current consumption against each limit.

<Note>
  Check it around three-quarters through the month, not at the end. Hitting the unit ceiling
  stops outbound messages — including [broadcasts](/help/campaigns/broadcasts) mid-send — and
  noticing on the last day leaves no time to act.
</Note>

## Growth packages

Extra units in bulk, with bonus units at larger sizes. These top up the pool without
changing your plan — the right answer for a one-off busy month, such as a seasonal campaign.

If you exceed the pool every month, changing plan is cheaper than repeated top-ups.

## Changing plan

Plans are activated by the team — **Upgrade** starts that conversation rather than charging
immediately.

## Running out

When the pool is exhausted, outbound sending and AI replies stop. Incoming messages still
arrive and your team can still work; it is sending that is blocked.

Buy a growth package for immediate relief, then look at what consumed the units. A common
cause is an AI agent assigned to a high-volume channel where most conversations did not
need one — see [AI agents](/help/ai/agents-overview).