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 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

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.

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.

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.

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.