Comparison

Mercari vs Poshmark

Mercari and Poshmark both land on Depends.

Mercari

Depends

Confidence: Medium

Use it if you casually buy or sell secondhand items and accept a flat 10% fee plus imperfect support.

Depends

Confidence: Medium

Fine for casual sellers clearing closets who accept a 20% cut in exchange for a built-in audience.

Mercari versus Poshmark
Compare	Mercari	Poshmark
Verdict	Depends	Depends
Best for	Casual sellers clearing closets	Casual closet cleanouts
Who it's not for	High-volume professional resellers	High-volume resellers . the 20% cut eats margins
Privacy	Legitimate service overall, but two improper-authorization CVEs (CVSS 7.5) and a 2021 Codecov-linked data breach are on record.^⁸	2018 breach forced password resets; a 2024 arbitrary-file-upload CVE and bot-traffic disruptions are also on record.
Support quality	Trustpilot and BBB report unhelpful support	BBB disputes and 10,195 PissedConsumer reviews
Public sentiment	Users like the app's simplicity and authentication, but many complain about fee changes, support quality, and seller treatment.^⁴	Sentiment skews negative on complaint sites and Reddit, with recurring themes of high fees, weak support, and 2023-2025 platform changes frustrating former power users.¹⁵
Biggest gotcha	New fee structure since January 2025 added buyer fees; some sellers say it's no longer worth cross-posting^³	20% commission plus $2.95 on sub-$15 sales . price items or margins vanish