Download Coalstack

Safe server upgrade (Coalstack Plus): move a Java server to a newer Minecraft version with your mods and plugins checked first, and a one-click undo.

Fixes adding NeoForge and Forge servers you already have, the NeoForge version list for newer builds, Notify automations that did not run for every trigger, and Auto-fix Undo reporting when a file is in use. Messages for paid features now point at Coalstack Plus.

New Java servers are created with the whitelist off, because Minecraft 26 turns it on by default and new servers were refusing everyone. You get a notification when the whitelist turns a player away, and a checkbox in the New Server wizard if you want it on. Linux builds can now receive automatic updates, starting with the update after this one.

Coalstack domains: claim a yourname.coalstack.org address for a server from Networking, Custom Domain. It is off until you turn it on, and a checklist flags settings that are risky once a server has a public address. Also a redesigned Conduit page, and the Account page now shows which version your key updates to.

Wake on join: a stopped Java server starts when a player tries to join and can go back to sleep when it is empty. Backups are now read back and checked for a world before they are copied anywhere, and Coalstack warns you when a server runs short of memory or its drive runs low on space. Also adds optional Discord Rich Presence and fixes the Send webhook automation for Discord and Slack.

Introduces Coalstack Plus, a one-time purchase that unlocks every local feature, and optional web relay plans for controlling your servers from other devices. Auto-fix on launch can repair a server that will not start (a missing mod, a client-only mod, a taken port, too little memory, an unaccepted EULA) after you review each change, and a new Check for problems button on the Content tab finds those issues before a crash.