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An MTU is a unique visitor bucketed into any experiment during a calendar month. One per person per month.
Billing page

Billing page. Plan, usage against your caps, and the upgrade path.

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How it is counted

Every visitor gets a stable id (a UUID in localStorage and a cookie on your site’s eTLD+1). The first time in the month a visitor is bucketed into any experiment, they count as one MTU. Every subsequent bucketing that month, they do not. Counted server-side by hashing the visitor id and checking a Durable Object per organization. There is no client-side gate a misconfigured page can trip; the meter is entirely on our side.

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What does not count

  • A visitor on a page with no experiment. Not counted.
  • A visitor who did not enter (allocation < 100 %). Not counted.
  • A blocked IP (Settings → Blocked IPs). Dropped before the MTU record is written.
  • An opted-out visitor (Visitor opt-out). The snippet never fires.
  • Preview mode. Preview does not send real beacons.

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MTU across multiple sites

Counted per organization, not per site. Same visitor on site-A.com and site-B.com in the same org counts once. Different organizations for the same real user count separately. the org id is part of the hash.

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MTU across the month

Resets at the first of every month UTC. A visitor tracked in January starts fresh in February.

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Going over

If you exceed your plan’s cap:
  • Already-bucketed visitors stay bucketed. Their variant does not change. Statistical validity of your running experiments is preserved.
  • New visitors stop being bucketed. They see the Original.
  • You get an email with a graph of your recent MTU consumption and a link to upgrade.
  • You are not auto-charged. The bill does not change on its own.

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Downgrading mid-month

If you downgrade to a smaller plan and your current MTU is above the new cap, the same overage behavior kicks in immediately, new visitors stop being bucketed until next month. Downgrading does not delete data or archive experiments. History stays. See refunds for the full cancellation shape.

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Enterprise

If your MTU is much larger than the top public plan, contact enterprise@abtestly.com. Custom caps, custom pricing, custom SLAs.