Newsletter Spy might be a bit more popular than Duuce. We know about 1 link to it since March 2021 and only 1 link to Duuce. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Nice. You should check out duuce.com. It's a marketplace for selling newsletters. Source: 11 months ago
I would suggest using Newsletter Spy to get data about some top newsletters and subsequently add some to your site. Source: about 3 years ago
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