COS vs ThredUp
The facts we hold on both, side by side. Checked October 23, 2026.
In short
- ThredUp gets more monthly visits than COS: about 26M vs 16M.
- ThredUp runs more live Meta ads than COS: 332 vs 205.
- ThredUp advertised on more days in the past 12 months: 27 vs 20.
- ThredUp's store is older: created Dec 2016, COS's in Nov 2020.
| Fact |  COS |  ThredUp |
|---|---|---|
| Monthly visits (SimilarWeb) | 16M (Sep 2026) | 26M (Sep 2026) |
| Live Meta ads | 205 | 332 |
| Store created | Nov 2020 | Dec 2016 |
| Niche | Apparel | Apparel |
Questions shoppers ask
- What is the difference between COS and ThredUp?
- ThredUp gets more monthly visits than COS: about 26M vs 16M. ThredUp runs more live Meta ads than COS: 332 vs 205. ThredUp advertised on more days in the past 12 months: 27 vs 20. ThredUp's store is older: created Dec 2016, COS's in Nov 2020.
- Do COS and ThredUp sell the same things?
- Both are in the Apparel niche.
Facts from the Meta Ad Library, SimilarWeb, Trustpilot and each store; a fact only one of them has is left out. Is COS legit? · Is ThredUp legit?