Last month, when Jill Frechtman lost her grandmother, she wanted to mark her passing with a memorial service—an effort complicated by a lockdown that prohibited gatherings of family and friends.

With some cajoling, she convinced her parents to try GatheringUs, an online service that hosts memorials on Zoom, starting at $1,400. Without leaving her Manhattan apartment, Ms. Frechtman put together an online service for 89-year-old Blanche Frechtman, the head of their family and a beloved community figure, in just two hours.

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