On Mercari and Depop, search ranking decays over time — newer listings appear above older ones. The Refresher edits your listings on a schedule (a tiny price tweak or a re-save) to reset their freshness clock. It runs through the Closo extension and is enabled for all sellers.
Mercari
Refresher does a no-op edit (saves the listing again with the same fields). Mercari's algorithm treats this as fresh, like you just listed it.
Depop
Closo bumps Depop listings via the same flow Depop's own “Boost” feature uses, except free. Refreshes are rate-limited: each product can be refreshed at most twice in any 24 hours, and an account refreshes up to 200 listings per day. Closo works through your closet in batches, so over a day it spreads the boosts across your items rather than hammering the same few.
Poshmark
Poshmark uses the Sharer instead of the Refresher — sharing is what bumps you in their search. The Sharer covers Poshmark.
eBay / Shopify
eBay and Shopify don't reward freshness, so there's no Refresher for them. Save your time — focus on titles and item specifics.