i've been through a few agencies and in-house teams, and the feedback loop is where most campaigns fall apart. someone in the thread already nailed the core issue - it's not about whether you use a proofing tool, but which one fits your workflow.
the two things that kill adoption every time are: (a) forcing clients to create yet another account, and (b) expecting them to learn a new interface. If your client logos are in regulated industries, approval workflows become non-negotiable. For B2B, we send a mix of static decks, video walkthroughs, and live landing pages. a tool that only handles one format is useless.
i've used Pastel for quick website reviews - works because there's zero login friction. Markup.io covers a broad file set but it's owned by Ceros now, so expect eventual platform tie-ins. Filestage is solid if you need audit trails for compliance-heavy clients. I haven't tried Aligno but the multi-format, no-signup approach sounds practical for early-stage agencies.
the real insight: don't try to Frankenstein this inside Asana or a design tool. The minute you add project hierarchy or layer permissions, the feedback stops being about the work and starts being about the system. Dedicated proofing tools exist because they reduce the cognitive load to exactly one step: leave a comment. Everything else is noise.
