Hi Pam,
Etsyonsale is a 3rd party app that provides a similar service to OrangeTwig's 'Product Sale' feature.
(Info about OrangeTwig's Product Sale:
https://www.etsy.com/teams/16272/social-media-marketing-for-etsy-a-z/discuss/15001071)The differences between the two:
- Etsyonsale puts an entire section from your shop on sale. (e.g. you could put all the products in your shop section 'watercolor art' on sale)
- OrangeTwig allows you to put any products in your shop (across different shop sections) on sale.
- Etsyonsale charges per sale you put
- OrangeTwig's Product Sale feature is currently free (this may become a paid feature later)
Regarding the products on etsyonsale dot com - these are just an aggregation of all the products that have been put on sale using the etsyonsale app. Any item you put on sale using OrangeTwig will not be pulled to the etsyonsale site.