Publishing & calendar
Hootsuite
Bulk scheduling to 350 posts, heat-map best-time scheduling and a paid-plus-organic calendar are on the record, but we found no public information on CSV import, queue-based or evergreen scheduling, previews matching each network's rendering, or what a customer actually sees when a scheduled post fails overnight — the only failure trace captured is a 2021 changelog entry resolving Facebook scheduled-post errors.
Sprout Social
There is a calendar with day, week and month views, queue-style scheduling through ViralPost and Sprout Queue with send times taken from follower engagement, and confirmed create, schedule and publish support for Instagram and for Threads including text, image, carousel and video. But we found no public information on drafts, per-network variants, bulk or CSV import, previews matched to each network's rendering, or what happens when a scheduled post fails overnight — the failure question is the one I ask first and the pages do not take it up.