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2 tools that solve a similar problem. Compare what each costs and what it covers.
Diagrams where viewers cost nothing
Whimsical covers diagrams and boards from $10 with a free tier and charges nothing for viewers, cheaper for a team that mostly reads.
A board for the vague part of a project
Milanote is a board for the vague early part of a project, from $10 with a free tier, better for gathering references than for a workshop.