Flight Rising and Lioden both generally average between 1,500 and 2,600 active users throughout the day. Lioden has over 489k members. Marapets averages about 4,800-5,100 daily active players.

Webkinz is another pet site that remains quite active, with its users being very engaged on social media and various forums across the internet.

Subeta is also fairly active, averaging about 300-500 users online daily. Xanje averages 120-200 players online, while Sylestia sees 100-250 players online at any given time.

Additionally, Rescreatu averages 250-270 active players daily, so they’re doing well in terms of daily activity.
 
You're absolutely right! Neopets and Marapets have been around for ages and they still have a strong following. I'd also like to add Subeta to the list.
Subeta is a great mention here too. I think it's basically because these sites have managed to evolve with the time while maintaining their core charm at the same time.
 
I remember neopets from when I was a kid. This was probably 25 years ago
 
Neopets and Marapets are indeed among the most popular and active pet sites, with strong, dedicated communities. Other notable sites include Flight Rising and Lioden, which have large player bases and consistent activity due to regular events and updates. While these sites may not reach Neopets' historical peak, they maintain vibrant user engagement.
 
I remember neopets from when I was a kid. This was probably 25 years ago
They’re still one of the largest pet sites in the industry and most active. According to their last stats update, they have an active player base of about 1 million or so users.


However, these numbers are probably much higher now, as this article was published in April of last year.


I believe Marapets has at least 2–3 million users, but I don’t think there are any other pet sites with close to 2 million users. Lioden, for example, has over 500,000 users. They currently have a total of 503,244 members.



On the other hand, Webkinz has over 20 million users, according to data from 2020, which makes them pretty close to Neopets (stats-wise).



Flight Rising likely has between 150,000 and 300,000 total users, as they average 1,500–3,000 users online daily.



Neopets has 150 million registered users from the totality of its 25-year history, but currently only has about one million annual active users. Still, Law says those active users are really active. Many have been playing for over 10 or even 15 years and stuck around through the worst days of the company. They’re few, but mighty.
 
Neopets is the obvious candidate for the most active virtual pet site. That's not in dispute. Flight Rising is also a very active virtual pet site. It is easily among the top three active virtual pet sites.