FTTHelper vs World Anvil
FTTHelper keeps player notes private at the database level. World Anvil is a world encyclopedia with article permissions.
World Anvil
World Anvil is built as a public-or-private wiki of a setting: articles, maps, timelines, subscriber worldbuilding.
FTTHelper
FTTHelper stores PRIVATE, DM_ONLY, and PARTY rows behind Postgres RLS. A player cannot read a DM-only subject even if they guess the URL. Session capture and the SRD catalog live in the same product.