Workspaces
A workspace owns a set of monitored sites, audit history, alert rules, and team members. Workspaces are billed independently and are isolated from each other for permission purposes. Most teams have one workspace; agencies typically have one per client.
Sites
A site is a single host or origin under audit. The audit cadence, alert rules, and history retention are all per-site. Multiple sites in the same workspace share team members and billing but are otherwise independent.
Audits and runs
An audit is the configuration; a run is one execution of the audit. Runs are immutable once they complete; the catalog of checks for a run is the catalog at the time the run started, even if checks have shipped since. This makes regression diffs comparable over time.
Findings
A finding is one check firing on one URL in one run. Each finding has a severity (error, warn, info), a category, a per-check description, and a 'how to fix' guide that lives at /catalog/<check>.
Alerts
An alert is a finding (or set of findings) that matched an alert rule and was routed to a channel. Alerts are diff-aware: a check that has been red for six months stays in the report but does not page anyone. Alerts fire on changes.