FTTHelper vs LegendKeeper
FTTHelper is a campaign workspace with spoiler-safe subjects. LegendKeeper is a mapping-first wiki.
LegendKeeper
LegendKeeper organises a world as linked pages and maps. Visibility is a document permission.
FTTHelper
FTTHelper subjects carry visibility on the row, enforced in the Postgres database. Transcript ingest can land DM_ONLY until the DM shares. The catalog (SRD monsters, spells, items) is a separate public surface.