Monterva has two plans. Solo is $29 a month or $290 a year: 20 reviews a month, three connected repositories, three workspace members and weekly scheduled reviews. Team is $99 a month or $990 a year: unlimited reviews within fair use, ten repositories, ten members and daily scheduled reviews. Both include shareable report links and "what changed since your last review".
Both plans start with a 3-day trial of the full plan, which needs a card. There is no free plan.
Paid plans are not on sale yet — Monterva is still in pre-release and takes no payment. The account and billing page explains how the limits work.