Per-seat pricing assumes a human at a desk. When agents do the work — and spin up and down — seats are the wrong unit. Usage- or workload-based pricing fits better.
drop's take: free
We sidestep the question — drop is free and open-source. Run it for one human or a fleet of agents; self-host and there's no per-anything at all.
FAQ
Is it really open-source and self-hosted?
Yes — MIT licensed, and it runs on your own Vercel Blob + domain. No third party ever holds your content (it's encrypted client-side) or controls your URL.