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Mercari holds 4.75 stars from 614,961 Google Play ratings, 88.97% of them five stars. We read 787 negative reviews from nine months: 198 describe what happens when a deal goes wrong, and 34 of those are about a clock and a rating that do not survive a dispute.
UPS holds 4.53 stars from 306,167 Google Play ratings. We read the 735 substantial negative reviews from April to August 2026: 84 are about changing a delivery, 31 could not make the change at all, and 16 paid for the membership and still hit a fee or a wall.
FedEx alerts you switched on never fire, and the login that would fix them loops. We read 514 recent 1-3 star reviews from both stores to map what actually breaks.