I was looking for a Loom replacement and this could be it.
They are workflow-focussed—the first thing they explain in the onboarding is how to annotate a screenshot fast, with shortcuts. Great!
I just tried how it looks when an annotated screenshot is shared with a third party (potentially a client) – it did not contain my annotations, and initially needed to be "unlocked", so made public. Still I was not able to see my annotations. I am sure this will be fixed in the future. Being a Loom-replacement is probably not their main goal, but if they smoothen the UX, this will make a great replacement.
I hope guest users will be able to access annotations and voice / video recordings in the future without the need to sign up.