A plain description of what Luisearch actually stores, based on the real backend code — not a legal template.
No account or API key is required to search. Anonymous requests are a fully first-class path, not a degraded fallback — you just get a lower rate limit (see Tiers).
Every search is logged server-side in a query_log table: the raw query text, the result count, a timestamp, and — only if you searched using an API key — which key made the request. Anonymous searches are logged too, just without anything tying them to an account.
This log does not currently expire automatically. Automatic cleanup (deleting entries past a retention window) is on the roadmap.
The Incognito toggle (in Settings) currently suppresses local browser history only; it does not yet suppress the server-side query_log entry. Extending it to cover both is planned.
Account-based services in the family (LuisPaper, LuisDrive, etc.) keep their own separate accounts and data, independent of anything on this page. Each has its own login and storage, not shared with Luisearch's search logs.