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I am particularly interested in a comparaison between this new one from Supabase/Fly and the one from Neon.

Main thing I want to know: which of the managed Postgres services allow for logical replication.

I love Heroku, render and neon is promising - but non allow access to the WAL.

Hey, supabase employee here. We allow you to use logical replication - https://supabase.com/docs/guides/database/replication

AFAIK all the others mentioned do not allow logical replication as you noted.

Can I ask what your use-case is for logical replication on something like neon?

So I can run something like Supabase or WalEx which subscribe to WAL changes.

Ah, gothca. I've mostly used triggers and LISTEN/NOTIFY for those things, so haven't tried the WAL methods.

There’s significant limitations with the trigger approach.

Just an FYI: neon just released logical replication.