They met going through co-founder matching separately — Elia at EF in Paris, Alessia on the YC platform from Sri Lanka — and called every day as friends complaining about not finding the right match. At one point they said "but why are we not brainstorming together at least," decided to brainstorm, and directly ended up on an idea.
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Both were trying to find a co-founder at the same time. Elia was in Paris, Alessia was in Sri Lanka, "but we're doing the exact same thing and we were calling every day as friends... like talking about this experience and we kind of complain about not finding the right match and being super motivated but really not finding the person that you want to be with." Then the realization: "at one point we just said but why are we not brainstorming together at least. So at one point we decided to brainstorm and we directly end up on an idea." It wasn't VibeFlow yet, but "we saw that the team was working well."