No price lists below: everybody's change by region and by month. The
shape of what you are buying does not.
A Realms-style hosted world
A world hosted by the people who make the game. Nothing to set up, a small number of slots, and it stays up when you log off.
What is good about it. Genuinely the easiest thing there is. If all you want is somewhere for a few people to play vanilla, it is hard to beat.
Where it stops. It is vanilla and it stays vanilla: no mods, no plugins, no datapacks. Nobody in it can build you anything. An empty map is an empty map until somebody places every block by hand.
A rented server from a hosting company
You pay for RAM and a control panel. Install what you like: plugins, datapacks, mods, whatever you can configure.
What is good about it. Total control, and the market is competitive enough that it is cheap.
Where it stops. You are now a server administrator. Somebody has to choose the plugins, keep them on the right version, and fix it at 9pm on a Sunday when everyone says it is down. The AI in this market lives in the billing panel, not in the game.
An AI build generator
A website you describe a building to. It sends back a schematic file (.schem, .litematic or .nbt) for you to import with WorldEdit.
What is good about it. Fast, cheap, often free, and the results can be genuinely impressive. If you want one castle and you already run a server with WorldEdit on it, this is the shortest path there is.
Where it stops. It hands you a file. Somebody still has to own a server, install WorldEdit, work out where to paste it and paste it, and nobody watches it go up, because it never happened in a world. It cannot mine, craft, play survival beside you or write you a game. It makes builds, and a build is only one of the things you might want.
A free AI companion mod
A mod, or a desktop app, that puts an AI character into your game.
What is good about it. Free, and some of them are clever. Worth a look if you are technical and playing on your own.
Where it stops. Everybody who wants to see it has to install it, on the right version, on their own machine. In practice that makes it a single-player toy. Nothing it does survives you closing the laptop, and the ones that generate code warn you not to point them at a server other people are on.
Side by side
The differences that are actually differences.
A Realms-style hosted world
A rented server from a hosting company
An AI build generator
A free AI companion mod
Cubelings
Friends join with unmodified Minecraft
●yes
●yes
◐sort of
—no
●yes
World stays up when you log off
●yes
●yes
—no
—no
◐sort of
Nothing for you to configure
●yes
—no
—no
—no
●yes
Something in the world that builds what you ask for
—no
—no
—no
◐sort of
●yes
It builds in a world, not into a file you import
—no
—no
—no
◐sort of
●yes
Mines and crafts the materials in survival
—no
—no
—no
◐sort of
●yes
New games written and loaded while you play
—no
◐sort of
—no
—no
●yes
It checks its own work and tells you
—no
—no
—no
—no
●yes
Custom companion names and skins
—no
—no
—no
◐sort of
—no
Self-service world downloads
◐sort of
●yes
●yes
●yes
—no
● yes ◐ sort of, with conditions — no
The Cubelings column is the current Paper beta. Empty worlds sleep
and wake when you connect. What the beta does not do yet
is kept in one list.
The short version
What none of the others do
Any of them will give you somewhere to play. A Realms world is the
simplest, a rented box gives you the most control, and a free companion
mod costs nothing if you are happy installing things and playing alone.
What none of them give you is somebody standing in the world with you.
Cog builds what you describe where you are standing, writes new games on
request, and plays survival beside you under the rules you play by. The
world stays up when you log off, your friends join with the game they
already own, and we run the server.