Core Keeper Server Hosting: Limits & Best Play

Free Core Keeper server hosting options exist, but they all come with significant limits—fewer players, forced downtime, and no mods—so for most groups the best way to play is to host from your own PC or a paid service. This article explains what free options actually offer, what their hard caps are, and how to pick the setup that fits your group size and playstyle.

Formula

The average pace is the total time divided by the distance:

pace (min/km) = finish time (min) ÷ distance (km)

The average speed is the distance divided by the time in hours:

speed (km/h) = distance (km) ÷ (finish time (min) ÷ 60)

Variables: t = finish time in minutes, d = distance in kilometers. The first output is the pace in minutes per kilometer; the second is the speed in kilometers per hour.

Worked Example

Using the default values from the calculator: finish time = 50 minutes, distance = 10 km.

1. Pace = 50 ÷ 10 = 5.00 min/km.
2. Speed = 10 ÷ (50 ÷ 60) = 10 ÷ 0.8333 = 12.00 km/h.

So with a 50-minute 10 km run, your average pace is 5:00 per kilometer and your average speed is 12.0 km/h.

Why Free Hosting Exists and What It Really Offers

Core Keeper is a multiplayer sandbox game where you and friends explore, mine, build, and fight bosses. The game supports dedicated servers, which means you can run a world that stays online even when the host player is offline. Free hosting services—like those offered by some game server providers as a trial or a limited tier—let you spin up a server without paying. But they are not a full replacement for a paid or self-hosted server, and they come with trade-offs that can ruin a long playthrough.

Most free tiers are designed as a taste of the paid product. They typically give you a small server for a short time (often 24–72 hours) or a permanently limited configuration. Because Core Keeper worlds can grow large and complex, a free server that resets or shuts down after a few days can be frustrating if you’ve invested hours into building a base.

Hard Limits of Free Core Keeper Servers

Every free hosting option has concrete caps. Here’s what you’ll commonly hit:

• Player slots: Most free tiers allow 4–8 players, while paid servers commonly support 10–16 or more. The game itself can handle more, but the host’s CPU and network become the bottleneck.
• RAM and CPU: Free servers usually get 1–2 GB of RAM and a shared CPU. Core Keeper can use more than 2 GB on a large world with many structures and items, leading to lag or crashes.
• Storage: World saves can grow to hundreds of MB. Free tiers often cap storage at 1–5 GB, which can fill up quickly if you explore a lot.
• Uptime: Free servers may shut down after a period of inactivity (e.g., 1 hour) or after a total lifetime (e.g., 48 hours). Some require you to manually start them each time.
• Mods: Many free hosts do not support mods, or only support a few. Core Keeper has a modding community, but free tiers often lock that out.
• Geographic location: Free servers are often in a single region, so if you and your friends are spread across continents, you’ll all feel the latency.

These limits are not arbitrary—they exist because running a server costs money. The provider is hoping you’ll upgrade to a paid plan.

How to Choose the Best Way to Play

The best way to play depends on your group size and how long you plan to play. Here’s a practical breakdown:

• 1–4 players, casual sessions: Use the in-game “Hostâ€� option. The host’s PC runs the world, and friends join via Steam or LAN. This is free, supports mods, and works well for short sessions. The downside is the world is only online when the host is playing.
• 5–8 players, frequent sessions: A dedicated server—either self-hosted on an extra PC or a paid service—is more stable. If you have an old PC or a spare laptop, you can run a dedicated server for free using the Steam “Core Keeper Dedicated Serverâ€� tool. This keeps the world online 24/7, but you must manage updates and backups yourself.
• 9+ players or long-term worlds: A paid server is the most reliable. You get more RAM, better CPU, and support. Prices vary, but you can expect to pay around $10–$15 per month for a 10-player server. If you’re serious about a long playthrough, the cost is often worth it.

For most groups, the best free option is self-hosting on a spare PC. It gives you full control, no time limits, and no player cap beyond what your hardware can handle. The only cost is electricity and your time to set it up.

Common Problems and How to Solve Them

Even with a good setup, you’ll run into issues. Here are the most common ones and what to do:

• “Server not respondingâ€� or timeout: Check that the server is actually running and that your firewall allows inbound connections on the game’s port (default 27015 for Steam). If you’re using a free host, the server may have shut down due to inactivity.
• Lag spikes: This is usually a CPU or network issue. On a free server, you can’t upgrade, so try reducing the number of players or moving to a paid plan. On a self-hosted server, close other programs and make sure your internet upload speed is adequate (at least 5 Mbps for 4 players).
• World corruption: Always back up your world files. On a self-hosted server, copy the save folder regularly. On a free host, you may not have access to backups—another reason to use a paid or self-hosted server for long-term worlds.
• Can’t join because of version mismatch: Make sure the server and all clients are on the same game version. Free hosts may not update automatically, so you might need to wait for the host to update.

If you’re using a free host and hit a problem, the first step is usually to restart the server. If that doesn’t work, check the host’s documentation or ask in their Discord—most have a community that can help.

Free Hosting vs. Self-Hosting vs. Paid

Here’s a quick comparison to help you decide:

• Free hosting: Zero cost, but limited player slots, storage, uptime, and no mods. Good for a one-off weekend with a few friends.
• Self-hosting (dedicated server on your own PC): Free (except electricity), full control, supports mods, no time limits. Requires a decent PC and some technical know-how. Best for groups who play regularly.
• Paid hosting: Costs money, but you get reliable uptime, good performance, easy setup, and customer support. Best for large groups or players who don’t want to manage a server.

For most people, self-hosting is the sweet spot. It’s free, and you learn a lot about how servers work. But if you just want to play with friends without any hassle, a paid server is the way to go.

Costs and Safety Considerations

Free hosting is literally free, but you pay in other ways: time, frustration, and lost progress. Paid servers cost money, but they save you time and headaches. Self-hosting has a small electricity cost—a typical PC running 24/7 might add $5–$15 per month to your power bill, depending on your electricity rates.

Safety-wise, always use a strong password for your server if it’s public. On a self-hosted server, keep the OS and game updated to avoid security issues. When using a free host, be wary of providers that ask for credit card details up front—some are scams. Stick to well-known providers or those with good reviews.

Also, remember that any server you don’t control can be shut down at any time. If you’ve built a massive base, you could lose it. Always keep backups of your world saves, especially if you’re using a free host.

Frequently Asked Questions

Can I host a Core Keeper server for free on my own PC?

Yes. You can use the “Core Keeper Dedicated Server� tool available via Steam. It runs a headless server that you can leave running. You’ll need to port forward on your router if you want friends to join over the internet. This is free and gives you full control.

What are the player limits on free server hosts?

Most free tiers cap at 4–8 players. The game itself can support more, but the server’s CPU and RAM will bottleneck. If you need more than 8 players, you’ll likely need a paid server or a powerful self-hosted machine.

Do free servers support mods?

Usually not. Free hosts often disable mods to reduce load and support costs. If mods are important to you, self-hosting is the best free option because you can install any mod you want.

How long do free servers last?

It depends on the provider. Some give you a 24-hour trial; others let you run indefinitely but with limited resources and possible inactivity shutdowns. Check the provider’s terms before you start a long playthrough.

Is it worth paying for a server?

If you play with a large group (8+ players) or want a persistent world with no downtime, yes. Paid servers are more reliable and save you the hassle of managing your own hardware. For small groups, self-hosting is usually enough.

What is the best free way to play Core Keeper with friends?

For 2–4 players, the in-game host option is simplest. For 5–8 players, self-hosting a dedicated server on a spare PC is the best free method. It gives you no time limits, full mod support, and you control everything.

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in t | Finish time | min | 50 | 0
in d | Distance | km | 10 | 0
out pace | Average pace | min/km | t / d | 2
out speed | Average speed | km/h | d / (t / 60) | 2