As of now, as a standalone, stable client. Beware of websites claiming to host it, as they are often just re-skinned 1.8 versions or, worse, phishing sites.
The community is actively working on "Eaglercraft 1.19" and "1.20" projects, which will pave the way for 1.21. For now, the best experience remains , which offers the best performance and the largest player base. eaglercraft 1.21
Some servers use plugins to allow 1.8 clients to join 1.21-compatible worlds. You won't see the new blocks, but you can interact with the community. As of now, as a standalone, stable client
Most developers in the community are currently working on a 1.20 or 1.19 port first. Jumping straight to 1.21 is unlikely until the foundation for modern rendering (like the 1.13+ engine changes) is fully established in the browser. How to Play "Modern" Minecraft in Your Browser Now For now, the best experience remains , which
While a true 1.21 Eaglercraft client isn't fully realized, there are workarounds:
The gold standard for performance and multiplayer. Eaglercraft 1.5.2: A nostalgic version for older hardware. The 1.21 Hype: What’s New?