Air Rivals

VS

Roblox

Air Rivals (also previously known as Space Cowboy Online and later as Ace Online) is an older multiplayer sci-fi dogfighting shooter with RPG elements. Although it once had a loyal niche following, it is now quite obscure and player numbers have dwindled due to its age and lack of major publisher support. I estimate a few hundred daily active players globally, mostly in private servers or small remaining official instances.

Roblox is a massively popular sandbox platform, released in 2006 but continually updated and widely adopted by younger audiences globally. It consistently reports tens of millions of monthly active users, with peak daily actives usually around 5–10% of monthly users. Recent filings and reports indicate Roblox has over 60 million daily active users, but this covers global user logins across many devices and experiences. Adjusting conservatively for reporting and engagement variance, daily actives typically exceed 50 million worldwide, but simultaneous users generally peak in the hundreds of thousands to low millions. As a platform with persistent worlds, it fits the broader MMO definition.