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

# Billing Overview

When you create a Sailbox, you specify the size of the VM. Your Sailbox can
use all the resources in its VM, and you are charged only for observed usage,
not capacity. For example, if a Sailbox with a 4 vCPU ceiling is using
0.01 vCPU, you are charged for 0.01 vCPU. You are not charged at all while a
Sailbox is sleeping, paused, checkpointing, or cold-starting.

## What each size includes

You pick a size at create time: `s`, `m`, or `l`. A size sets the vCPU count
and the default memory and disk ceilings, and it sets the creation charge.
Ceilings cap what a workload may use. They do not reserve anything, so a
bigger size doesn't cost extra while the Sailbox is idle.

| Size | vCPU | Memory ceiling | Disk ceiling |
| - | - | - | - |
| `s` | 1 | 16 GiB (up to 64 GiB) | 32 GiB (up to 128 GiB) |
| `m` | 4 | 32 GiB (up to 128 GiB) | 128 GiB (up to 512 GiB) |
| `l` | 8 | 64 GiB (up to 256 GiB) | 256 GiB (up to 1 TiB) |

Pass `memory_limit_gib` or `disk_limit_gib` at create time to set a ceiling,
within the range shown. The default size is `m`. Choose `s` for the fastest
cold starts and resumes. Its lower ceilings also cap what a runaway workload
can consume.

## Where to see usage

* **Dashboard.** The Sailboxes page at [app.sailresearch.com](https://app.sailresearch.com)
  shows spend for the period broken down by app and by Sailbox, alongside live
  CPU, memory, and disk utilization. The Billing page shows your credit
  balance and invoices.
* **CLI.** `sail box list` shows each Sailbox's current CPU, memory, and disk
  usage against its ceilings, and `sail box top` is a live view of the same.

## FAQ

<AccordionGroup>
  <Accordion title="Does a bigger size cost more?">
    You pay for actual usage, so choosing a larger size doesn’t increase your
    running costs on its own. Free has a small, size-based creation fee. Pro and
    Enterprise don't have one.
  </Accordion>

  <Accordion title="What does a sleeping Sailbox cost?">
    Nothing. Sleeping, paused, checkpointing, and cold-starting time is not
    billed. Charges resume when the Sailbox is running again.
  </Accordion>

  <Accordion title="Do copies cost the same as new Sailboxes?">
    Yes, the same pricing applies. Each copy bills for its own usage, with a
    size-based creation fee on Free and no creation fee on Pro or Enterprise.
  </Accordion>

  <Accordion title="What happens when my credits run out?">
    Sail pauses your running and sleeping Sailboxes and blocks anything that
    would add spend: creating, resuming, and running commands. Nothing is
    terminated, and you can still pause and terminate from the dashboard. Add
    credits on the Billing page, then resume the Sailboxes you need.
  </Accordion>
</AccordionGroup>