Pick a post that's out, set a budget, choose the countries, narrow the age and gender, see a reach estimate, launch. The spend, reach, and clicks come back to sit next to the organic numbers on the same post. No tab juggle, no second tool, no exporting a CSV to find out what the boost did.
This isn't a replacement for Meta Ads Manager. Custom audiences, lookalikes, conversion campaigns, A/B testing across ad sets: those still live in Ads Manager and probably should. Boost is the part most people actually need: take an organic post that's working, put paid spend behind it. Publer postponed shipping the full thing publicly. We shipped the useful subset.
The boost flow plugs into the same workspace as the Instagram scheduler and the Facebook scheduler, so the post you boost is the post you planned. Run boosts inside a client account on the agency plan with the Editor or Admin role. See pricing for the full comparison; Boost is on Agency and above.