A very nice video by KJ4YZI about Olivia and other digi modes. And that’s what he said: So many people have started using FT-8 on HF, but they leave all the other modes to die off, like Olivia.
Olivia isn't new, but it offers the weak signal efficiency and decoding in poor conditions while giving you some rag chew, not just zombie mode callsign exchange.
Check out this video to learn more, and I hope to see you on Olivia. Below are some links for the bandplans and more information.