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    2,054,849 files checkedFiles from Modrinth and CurseForge we downloaded and checked. Counted on 25 Oct 2026.636,163 files with their code readFiles whose code we turned back into readable code and read, in an isolated environment. Counted on 25 Oct 2026.269,417 projects gradedProjects with a letter from A to F. Counted on 25 Oct 2026.
    How it worksMalware we foundAPIAboutPrivacyTermsContact

    © 2026 ModgradeNot an official Minecraft product. Not approved by or associated with Mojang or Microsoft.

    SlimefunCore

    Plugin

    Custom unofficial Slimefun core build for Paper/Purpur 1.21.1x 26.x with Java 21-25 support, compatibility fixes, modern startup support, and stable loading for updated SF4 addons.

    B86/ 100
    • OverviewB
    • SecurityWarning
    • PrivacySends data
    • AINone found
    • CompatibilityUp to 26.2
    • ReleasesLatest 11 Oct

    Download

    SlimefunCore4-2872.jar

    Released 23 Sep 2026 · 21.6 MB

    Warning: something that can be risky, not proof of malware. It lowers the grade. The download stays available. See Security

    A newer alpha from 11 Oct 2026 is in Releases.

    Download
    OverviewSecurityPrivacyAICompatibilityReleases

    Why grade B

    How grades work

    Strengths

    • Stable releases
    • Public source code and a place to report problems

    Points lost

    • A warning from the file checks−3 points, B at most
    • First release only 6 months ago−4 points
    • Releases in only 7 of the last 24 months−1 point
    • Under 50,000 downloads−1 point
    All 11 criteria

    • Maintenance

      1 point lost26 / 27
      Last releaseHow long ago the newest file came out, or an existing file was marked as working on a new Minecraft version.13 days ago (11 Oct 2026) 12 / 12
      Supports popular versionsWhether the plugin has a file for a Minecraft version that 15% or more of the popular plugins updated in the last 6 months also list. Plugins often list many versions, so an older one can count.26.2 on Bukkit, Paper, Spigot and Purpur. 15% or more of the popular plugins updated in the last 6 months also list 26.2. Latest Minecraft: 26.3. 9 / 9
      Regular releasesIn how many of the last 24 months a new file came out. Full points at 8 months.Releases in 7 of the last 24 months 5 / 6

    • Stability

      Full points12 / 12
      Removed from modpacksHow many modpacks removed it in a later version of the pack. We can only see this in modpacks with two or more versions. A pack that swaps it for another edition of the same project, or that is rebuilt from scratch, does not count.Does not apply. Plugins are not added to modpacks.
      Quick fixesHow often a release needed a quick fix: a new release within 3 days to fix a problem in it.2 of its 16 releases in 2 years needed a quick fix (13%) 7 / 7
      Known conflictsHow many projects say they do not work with it, compared with how widely it is used. Packs, small projects, forks, ports, add-ons, alternatives and old versions do not count.None 5 / 5

    • Transparency

      Full points10 / 10
      Source codeWhether the project page links to its source code, so anyone can read what it does.GitHub · SlimeCore-MC/Slimefun4Core 7 / 7
      Place to report problemsWhether the project page links to a place where players can report problems: an issue tracker or a Discord server.GitHub issues · SlimeCore-MC/issues 3 / 3

    • Popularity

      1 point lost3 / 4
      DownloadsDownloads on Modrinth and CurseForge. Full points from 50,000.7,960 3 / 4

    • Track record

      4 points lost4 / 8
      AgeHow long the project has existed. It counts less when no new file came out recently.6 months, 16 releases 4 / 8

    • Security

      Warning: B at most0 / 3
      File checksThis check adds no points. It can only take points away.Sends to a Discord webhook written or hidden in its code. Whoever owns it sees what is sent. This lowers the grade as long as it is in the latest files for recent Minecraft versions. See Security0 / 3
    Total86 / 100

    54.9 of the 64 points that apply = 86 out of 100. The points above are rounded to whole numbers.

    Images

    • 🔮 Magic & Altars
    • 🏭 Awesome Factories
    • ⚡ Reactors & Electricity
    • Add-Ons Usage [ 💢 In-Game ]
    • 🤝🏻 CREDITS & DISCLAIMER

    Details

    Creator
    rutwok-labs
    License
    GNU General Public License v3.0 only
    Downloads
    8.1K
    Created
    16 Apr 2026
    Official page
    Modrinth
    Links
    Source code , Issues , Wiki , Discord

    Security

    Warning: a complete Discord webhook is written in its code. Whoever owns that webhook sees what the mod sends to it

    Only in its files for Paper 26.1 to 26.2.

    We found this in its code, read without running it.

    A Warning is not proof of malware. The download stays available.

    This lowers its grade: −3 points, B at most.

    Wrong result? Tell us.

    What it can do on your server

    Sends to a fixed Discord webhookWarning
    A complete Discord webhook is written in its code. Whoever owns that webhook sees what the mod sends to it. Only in its files for Paper 26.1 to 26.2.
    Connects to the internet
    It has code that can go online. Found in the plugin's own code and in code libraries built into it. See Privacy
    Starts other programs
    It can start another program on your computer. Found in the plugin's own code and in code libraries built into it.

    Why we show this: a plugin runs on your server like any program, so harmful code in it can take over the server. Our checks look for known signs of harm. They cannot prove that a file is harmless. In the grade: malware means no grade, and a Warning in a latest file for a recent Minecraft version lowers it.

    How we checked · Both latest files checked, last on 24 Oct 2026
    • FilesWe download the files from Modrinth or CurseForge and look at what is inside them and what their code can do, without running them. Fixed rules tell what is harmful.
      2 latest files: the newest file for each Minecraft version and loader. Both are for recent versions. Recent versions: those released in the last 2 years, plus 1.20.1 and 1.21.1, among the most played in modpacks. See each file in Releases
    • Their codeWe turn the code of the files back into readable code and follow what it does, without running it. This shows what it downloads, what it sends and where your login goes.
      Read without running it
    • Sends to a fixed Discord webhook
      io/github/thebusybiscuit/slimefun4/core/report/ReportSessionManager Discord webhook address: https://discord.com/api/webhooks/154935461629317...io/github/thebusybiscuit/slimefun4/implementation/Slimefun Discord webhook address: https://discord.com/api/webhooks/154935461629317...
    • Starts other programs
      Purpose not known.
    • Looked for, not foundWe looked for these in the file and did not find them.
      Folders outside the game, updating itself, the webcam or microphone, an AI service.

    Privacy

    Sends usage statistics, crash reports and unknown data

    Sent to analytics.slimefun.dev, api.mclo.gs, discord.com, bstats.org and an address built while the game runs.

    Only some of its files send crash reports and unknown data.

    We found this in its code, read without running it.

    Why we show this: a plugin can send things about your server and its players over the internet, like their player name or their login. Contacting an address to check for updates or download files sends nothing about them. Not in the grade: sending data can be normal for what a plugin does.

    How we checked · Both files read
    • Files readWe read the code without running it. We list each web address the code contacts while you play, and what it sends. Code that is never used is left out.
      The code of both files, for recent Minecraft versions. See each file in Releases
    • analytics.slimefun.dev
      Sends usage statistics.
      Usage statistics
    • api.mclo.gs
      Uploads crash reports or logs.
      Crash reports
    • api.modrinth.com
      Checks for a new version of the mod.
      Nothing about you
    • discord.com
      Talks to an online service the mod works with.
      Unknown data
    • minecraft-heads.com
      Purpose not known.
      Nothing about you
    • playerdb.co
      Purpose not known.
      Nothing about you
    • bstats.org
      Sends usage statistics.From a bundled library.
      Usage statistics
    • Address built while the game runsThe code builds this address while the game runs: it is not written in the file.
      Purpose not known.
      Unknown data
    • Named in its filesA crash report or usage data service named in the files of the mod. The code does not show when or what is sent.
      The code names Host name contains "telemetry" or "analytics" and bStats, services that receive usage data.

    AI

    No sign so far that AI was used to make it

    We looked for AI tools in its texts, files and images and found none.

    We have not read its code history yet.

    No sign of AI in the game

    We found no AI service, AI library or AI model file in its code.

    Why we show this: some players and servers avoid projects made with AI, and AI in the game can send what you write to an online service. Not in the grade: using AI does not tell whether a project works well or is kept up to date.

    How we checked · 4 places read
    • Author on ModrinthThe disclosure form on Modrinth. Since 13 Aug 2026, Modrinth's rules require it when a substantial part of the code is AI output, when an asset is mainly AI output, or when the project or its page relies on generative AI.
      Not read yet.
    • Code historyThe public code on GitHub: who made each change, credit lines such as "Co-authored-by", and its files.
      Not read yet
    • Description and changelogsThe description, project page and newest changelogs: sentences saying an AI tool was used, and text pasted from an AI chat.
      Nothing found
      16 changelogs read
    • Its filesFiles that AI coding tools leave behind (like AGENTS.md), and the texts inside the files you download.
      Nothing found
    • Images in its filesHidden data in the images of the files you download, where AI image tools write their name and settings.
      Nothing found
    • Code of the modThe code and files of the mod, read without running it: addresses of AI services, AI libraries, AI model files and a place for your own AI key.
      No AI service, AI library or AI model file
      3,000 code files read

    Compatibility

    See all 16 files
    Paper
    Spigot
    Bukkit
    Purpur
    1.2126.126.2

    Point at or tap a version to see its server software.

    Runs onWhere to install it: in your game, on the server, or both. As the author says on Modrinth.Install it on the server. Players join without installing anything.
    RequiresProjects you must also install for it to work. From the author's lists for its files for recent Minecraft versions, or from its project page.Nothing
    OptionalProjects it can work with but does not need. The author lists them.Nothing
    IncludesProjects packed inside its files.Nothing
    Speed of updatesHow fast it gets a file for new Minecraft versions, on average, compared with similar projects. Not part of the grade.It got a file 27 days after Minecraft 26.2 came out. No file yet for Minecraft 26.3.

    Related projects

    Projects that need SlimefunCore to work.

    ProjectTypeDownloadsGrade
    RailTransferBPlugin48 downloadsCodeBoxBPlugin45 downloads

    Latest files

    The newest file for each Minecraft version and loader. The files for recent versions come first. Recent versions: those released in the last 2 years, plus 1.20.1 and 1.21.1, among the most played in modpacks.

    MinecraftServerVersionSecuritySendsRequires
    26.1 to 26.2·Paper, Spigot, Bukkit, Purpur28722872 · SlimefunCore4-2872.jarSends: Usage data +2Requires:NothingWarningSomething that can be risky, not proof of malware. It lowers the grade. The download stays available. See Security.A complete Discord webhook is written in its code. Whoever owns that webhook sees what the mod sends to it.
    1.21 to 1.21.11·Paper, Spigot, Bukkit, Purpur27102710 · SlimefunCore4-2708.jarSends: Usage dataRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.

    16 releases

    MinecraftServerVersionReleasedSecurityGet it onDownload
    26.1 to 26.226.1 to 26.2·Paper, Spigot, Bukkit28802880 · SlimefunCore4-2880.jar (main file)Alpha·11 Oct 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthDownload · Alpha · 21.6 MB
    26.1 to 26.226.1 to 26.2The latest file for its Minecraft version and loader·Paper, Spigot, Bukkit, Purpur28722872 · SlimefunCore4-2872.jar (main file)·23 Sep 2026WarningSomething that can be risky, not proof of malware. It lowers the grade. The download stays available. See Security.Open this file on ModrinthDownload · Stable · 21.6 MB
    26.1 to 26.226.1 to 26.2·Paper, Spigot, Bukkit, Purpur28702870 · SlimefunCore4-2870.jar (main file)·20 Sep 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthDownload · Stable · 21.6 MB
    26.1 to 26.226.1 to 26.2·Paper, Spigot, Bukkit, Purpur28602860 · SlimefunCore4-2860.jar (main file)Alpha·20 Sep 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthDownload · Alpha · 21.6 MB
    26.1 to 26.226.1 to 26.2·Paper, Spigot, Bukkit, Purpur28342834 · SlimefunCore4-2834.jar (main file)·28 Aug 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthDownload · Stable · 21.3 MB
    26.1 to 26.1.226.1 to 26.1.2·Paper, Spigot, Bukkit, Purpur28322832 · SlimefunCore4-2832.jar (main file)·26 Aug 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthDownload · Stable · 21.3 MB
    26.1 to 26.226.1 to 26.2·Paper, Spigot, Bukkit, Purpur28142814 · SlimefunCore4-2814.jar (main file)·14 Aug 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthDownload · Stable · 21.3 MB
    26.1 to 26.226.1 to 26.2·Paper, Spigot, Bukkit, Purpur28022802 · SlimefunCore4-2802.jar (main file)Alpha·24 Jul 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthDownload · Alpha · 21.2 MB
    26.1 to 26.226.1 to 26.2·Paper, Spigot, Bukkit, Purpur28002800 · SlimefunCore4-2800.jar (main file)Alpha·13 Jul 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthDownload · Alpha · 21.2 MB
    1.21 to 1.21.111.21 to 1.21.11The latest file for its Minecraft version and loader·Paper, Spigot, Bukkit, Purpur27102710 · SlimefunCore4-2708.jar (main file)·30 Jun 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthDownload · Stable · 16.4 MB
    1.21 to 1.21.111.21 to 1.21.11·Paper, Spigot, Bukkit, Purpur27002700 · SlimefunCore4-2700.jar (main file)·1 Jun 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthDownload · Stable · 16.6 MB
    1.21.11·Paper, Spigot, Bukkit, Purpur26702670 · SlimefunCore4-2670.jar (main file)·19 May 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthDownload · Stable · 16.5 MB
    1.21.11·Paper, Spigot, Bukkit, Purpur26512651 · SlimefunCore4-2651.jar (main file)·8 May 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthDownload · Stable · 16.4 MB
    1.21.11·Paper, Bukkit, Purpur26472647 · SlimefunCore4-2647.jar (main file)Alpha·6 May 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthDownload · Alpha · 16.4 MB
    1.21.11·Paper, Bukkit, Purpur26262626 · SlimefunCore4-2626.jar (main file)Alpha·28 Apr 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthDownload · Alpha · 16.4 MB
    1.21.11·Paper, Bukkit, Purpur26142614 · SlimefunCore4-2614.jar (main file)Alpha·23 Apr 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthDownload · Alpha · 2.5 MB

    Quick fixes

    In the last 2 years, 2 releases needed a quick fix: a new release within 3 days to fix a problem. This counts in the grade, but it is too few to lose points.

    See them, newest first

    Quick fixesReleases followed within 3 days by a new release that fixes a problem in them.2

    • 287223 Sep 2026…server. No cargo/android behavior changes. Fixed - Sound crash: Legacy sounds.yml Bukkit enum names…
    • 283428 Aug 2026Build 2834(fixes) 🪨 Configurable Enhanced Furnaces Server owners…