An approval chain means a post can’t go live until someone else signs off — the question is whether that someone is internal staff, an external client, or both, and whether it’s one step or several.
What we found
Buffer: approvals only on the Team plan ($12/channel/mo); if an approver-required post doesn’t meet a platform’s requirements, no error is shown to anyone in the chain — it silently enters the queue and fails.
Later: internal approval on Growth+ ($50/mo); external client review via a shareable link (no client login needed) is also Growth+.
RecurPost: approvals and calendar-level approval included across plans, with unlimited workspaces (disclosure: same team as this site).
For approval workflows built as the primary product rather than an add-on tier, see Approval & Agency Workflow Tools.