Postpone and ONYX can both fit people who want to schedule social posts. The difference is scope. Postpone is a broader platform for publishing across multiple networks. ONYX is focused on BlueSky.
Choose Postpone if you need many platforms
If your workflow depends on scheduling across a wide set of social networks from one dashboard, a broader scheduler can make sense.
Choose ONYX if BlueSky is the channel
If BlueSky is where you are trying to build audience, ONYX keeps the workflow specific: write posts, use AI Voice, schedule threads, find better timing, and review BlueSky analytics.
The real question
Do you need one dashboard for every network, or do you need the cleanest possible BlueSky workflow? That answer decides the tool.
Try ONYX free if BlueSky is the priority.