Country preferences

You pick 1–3 priority countries. Trials with sites in those countries surface at the top of every result list; everything else falls below a divider.

First-visit popover

On your first visit, a popover asks where you might enroll. It pre-suggests one country based on your browser timezone (e.g. Asia/Kolkata → India), but you can change it.

• Up to 3 countries. If you pick a 4th, the oldest is replaced.
• Skip for now dismisses the popover for this tab session; reload after a tab close to be asked again.
• Selections are stored in your browser's localStorage (ctb:preferred-countries:v1). Clearing site data resets them.

The "Showing first" pill

Every search and chat page has a small pill in the header showing your current preferences. Click it to re-open the popover in edit mode. The label reads "Showing first: India, United States" (with your actual countries) — a reminder that these countries get priority placement at the top of results, not exclusivity. Trials from other countries still appear below, in the standard relevance order.

What it changes

When you have preferences set, result lists split into two strict buckets and one broader tail:

Inside each bucket, the existing sort applies — by default "highest phase first" puts Phase 4 → Phase 3 → Phase 2 → Phase 1.

What it does NOT change

• Total trial count is the same. Buckets only reorder; they don't filter anything out.
• Search filters are independent. Setting India as preferred doesn't restrict you to India trials — it just brings them to the top.
• Open-only / recruitment status still applies as usual.