Roblox

VS

Gemstone IV

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.

Gemstone IV is a classic text-based MMORPG that launched in 1998. Despite its historical relevance and dedicated niche community, its age and genre (text MUD) mean its active daily user base is quite small, likely in the low hundreds as is typical for old-school MUDs with a strong yet small fanbase.