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    2,055,424 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 2026.269,392 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.

    Seamless - Serverless Multiplayer

    Mod

    Host your world and invite friends to play without a server.

    D52/ 100
    • OverviewD
    • SecurityPassed
    • PrivacyGoes online
    • AIAI images
    • CompatibilityUp to 1.21.11
    • ModpacksIn 24
    • ReleasesLatest 3 Mar

    Download

    seamless-fabric-1.21.11-1.1.8.jar

    Released 3 Mar 2026 · 3.8 MB

    Passed: our checks found nothing harmful in this file.

    Download
    OverviewSecurityPrivacyAICompatibilityModpacksReleases

    Why grade D

    How grades work

    Strengths

    • Security checks passed

    Points lost

    • Many modpacks removed it−10 points
    • No source code link−7 points
    • No release in 8 months−6 points
    • Releases in only 2 of the last 24 months−5 points
    • First release only 9 months ago−5 points
    • Under 5 million downloads−1 point
    All 11 criteria

    • Maintenance

      11 points lost16 / 27
      Last releaseHow long ago the newest file came out, or an existing file was marked as working on a new Minecraft version.8 months ago (3 Mar 2026) 6 / 12
      Supports popular versionsWhether the project has a file for a Minecraft version that 15% or more of the popular mods updated in the last 6 months also support. A version many modpacks use, like 1.20.1 or 1.21.1, also counts after a release in the last 12 months.1.21.11 on NeoForge, Fabric and Quilt. 20% of the 995 popular NeoForge mods updated in the last 6 months also have files for 1.21.11. 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 2 of the last 24 months 1 / 6

    • Stability

      10 points lost12 / 22
      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.11 of the 19 modpacks with two or more versions removed it in a later one (58%) See the 11 modpacks0 / 10
      Quick fixesHow often a release needed a quick fix: a new release within 3 days to fix a problem in it.No quick fix in 2 years 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

      7 points lost3 / 10
      Source codeWhether the project page links to its source code, so anyone can read what it does.No link on the project page 0 / 7
      Place to report problemsWhether the project page links to a place where players can report problems: an issue tracker.legacy.curseforge.com 3 / 3

    • Popularity

      1 point lost3 / 4
      DownloadsDownloads on Modrinth and CurseForge. Full points from 5 million.101,343 3 / 4

    • Track record

      5 points lost3 / 8
      AgeHow long the project has existed. It counts less when no new file came out recently.9 months, 21 releases 3 / 8

    • Security

      Passed
      File checksThis check adds no points. It can only take points away.Our checks found nothing harmful in all 6 latest files for recent Minecraft versions. See Security
    Total52 / 100

    36.9 of the 71 points that apply = 52 out of 100. The points above are rounded to whole numbers.

    Images

    • Server Menu (OFF)
    • Server Menu (ON)
    • Join Menu
    • Friends Menu (WIP)

    In-game changes

    Changes the game's code in 2 areas, as a library other mods build on: User interfaceChanges 3 game code files in this area: menus, screens, tooltips, the chat window and the in-game overlay. and Game coreChanges 1 game code file in this area: the main loop, lighting and other code the whole game uses..

    Adds 1 key binding: Open friend list.

    Counted from the names and data files in the mod, so the list may not be complete.

    Keeps all of vanilla Minecraft's textures, models and sounds.

    Often used with it

    See all 30
    Essential ModBPacket FixerASophisticated StorageAReese's Sodium OptionsALithiumA

    Details

    Creator
    Ecentrix
    License
    All rights reserved
    Downloads
    101K
    Created
    5 Feb 2026
    Official pages
    Modrinth , CurseForge
    Links
    Issues , Discord

    Security

    No harmful code found

    We checked its files and read their code, without running it.

    What it can do on your computer

    Accepts connections from other computers
    It can accept connections from other computers. Found in the mod's own code and in okhttp, a library it includes.
    Starts other programs
    It can start another program on your computer, for example to open a link in your browser. Found in DiscordIPC, a library it includes.
    Uses folders outside the game
    It can read or write files outside your Minecraft folder, on the rest of your computer. Found: your user folder, launcher files, the temporary files folder and application data.
    Connects to the internet
    It has code that can go online, for example to check for updates, load skins or send crash reports. Found in the mod's own code and in 4 libraries it includes. See Privacy
    Creates settings files
    The mod keeps its settings in the config folder of your game, where you can change or delete them. 2 files in your config folder.

    Why we show this: a mod runs on your computer like any program, so harmful code in it can take your accounts or files. 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 · All 6 latest files checked, last on 16 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.
      6 latest files: the newest file for each Minecraft version and loader. All 6 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
    • Author on ModrinthThe disclosure form on Modrinth, where the author declares that the project reads or edits things on your system outside the game. Since 13 Aug 2026, Modrinth's rules require it when this applies.
      Nothing declared about your system outside the game.
    • Starts other programs
      Purpose not known.
    • Uses folders outside the game
      Reads launcher files.Finds the Minecraft folder.Uses the temporary files folder.Uses the system folder for application data.
    • Looked for, not foundWe looked for these in the file and did not find them.
      Updating itself, the webcam or microphone, an AI service.

    Privacy

    We found nothing it sends about you

    We read its code without running it: it contacts 3 web addresses while you play.

    Like any connection, each address it contacts sees your IP address.

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

    How we checked · All 6 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 all 6 files, for recent Minecraft versions. See each file in Releases
    • api.mojang.com
      Talks to an online service the mod works with.
    • 127.0.0.1
      Talks to a program on your own computer.
    • Address built while the game runsThe code builds this address while the game runs: it is not written in the file.
      Connects to game servers or other players.
    • Author on ModrinthThe disclosure form on Modrinth, where the author declares crash reports, usage data and advertisements. Since 13 Aug 2026, Modrinth's rules require it when a project collects data on its users or shows advertisements.
      Nothing declared about crash reports, usage data or advertisements.

    AI

    AI was used for its images

    ChatGPT is named in the images in its files.

    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 · 5 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.
      No AI content or AI features declared.
    • 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
      21 of 39 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.
      An image names ChatGPT in its image metadata seamless.png
    • 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
      160 code files read

    Compatibility

    See all 21 files
    Fabric
    NeoForge
    Quilt
    1.2126.126.2

    Point at or tap a version to see its loaders.

    Runs onWhere to install it: in your game, on the server, or both. As the author says on Modrinth.Needed in your game and on the server, or you cannot join.
    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 has no file for Minecraft versions newer than 1.21.11. Many recently updated mods still support 1.21.11.

    Modpacks using this project

    Find modpacks with it

    Modpacks that include Seamless - Serverless Multiplayer in at least one of their versions, most downloaded first.

    ModpackDownloadsLast version with it
    JustSimplyCreate1.8K downloadslast version with it 1 May 2026Yet Another Horror Pack1.6K downloadslast version with it 7 Jul 2026Atlas of Everything1.1K downloadslast version with it 21 Apr 2026CreateZone 671 downloadslast version with it 22 Feb 2026FarmersMC662 downloadslast version with it 15 Feb 2026NOTALLOWED (a arg experiance)496 downloadslast version with it 22 Feb 2026zombiecatpaw create446 downloadslast version with it 4 Aug 2026Cardinal World (Tensura)270 downloadslast version with it 19 Sep 2026Discrap261 downloadslast version with it 24 May 2026The Rainbow Knight 1.21.11 Edition205 downloadslast version with it 5 Jul 2026
    1 to 10 of 24123

    Often in the same modpacks

    Mods that modpacks often add together with Seamless - Serverless Multiplayer. Share: how many of the modpacks with Seamless - Serverless Multiplayer also have that mod.

    ProjectTypeShareGrade
    Essential ModBModin 63% of the modpacks with Seamless - Serverless MultiplayerPacket FixerAModin 58% of the modpacks with Seamless - Serverless MultiplayerSophisticated StorageAModin 58% of the modpacks with Seamless - Serverless MultiplayerReese's Sodium OptionsAModin 58% of the modpacks with Seamless - Serverless MultiplayerLithiumAModin 58% of the modpacks with Seamless - Serverless MultiplayerBadOptimizationsAModin 50% of the modpacks with Seamless - Serverless MultiplayerCreate AeronauticsBModin 46% of the modpacks with Seamless - Serverless MultiplayerCrash AssistantAModin 46% of the modpacks with Seamless - Serverless MultiplayerWhat Are They Up To (Watut)BModin 46% of the modpacks with Seamless - Serverless MultiplayerSodium Dynamic LightsCModin 46% of the modpacks with Seamless - Serverless Multiplayer
    1 to 10 of 30123

    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.

    MinecraftLoaderVersionSecuritySendsRequires
    1.21.11·Fabric, Quilt1.1.81.1.8 · seamless-fabric-1.21.11-1.1.8.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.11·NeoForge1.1.81.1.8 · seamless-neoforge-1.21.11-1.1.8.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.10·Fabric, Quilt1.1.81.1.8 · seamless-fabric-1.21.10-1.1.8.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.10·NeoForge1.1.81.1.8 · seamless-neoforge-1.21.10-1.1.8.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.1·Fabric, Quilt1.1.81.1.8 · seamless-fabric-1.21.1-1.1.8.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.1·NeoForge1.1.81.1.8 · seamless-neoforge-1.21.1-1.1.8.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.

    21 releases

    MinecraftLoaderVersionReleasedSecurityGet it onDownload
    1.21.11The latest file for its Minecraft version and loader·NeoForge1.1.81.1.8 · seamless-neoforge-1.21.11-1.1.8.jar (main file)·3 Mar 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 3.8 MB
    1.21.10The latest file for its Minecraft version and loader·NeoForge1.1.81.1.8 · seamless-neoforge-1.21.10-1.1.8.jar (main file)·3 Mar 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 3.8 MB
    1.21.1The latest file for its Minecraft version and loader·NeoForge1.1.81.1.8 · seamless-neoforge-1.21.1-1.1.8.jar (main file)·3 Mar 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 3.8 MB
    1.21.11The latest file for its Minecraft version and loader·Fabric, Quilt1.1.81.1.8 · seamless-fabric-1.21.11-1.1.8.jar (main file)·3 Mar 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 3.8 MB
    1.21.10The latest file for its Minecraft version and loader·Fabric, Quilt1.1.81.1.8 · seamless-fabric-1.21.10-1.1.8.jar (main file)·3 Mar 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 3.8 MB
    1.21.1The latest file for its Minecraft version and loader·Fabric, Quilt1.1.81.1.8 · seamless-fabric-1.21.1-1.1.8.jar (main file)·3 Mar 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 3.8 MB
    1.21.1·NeoForge1.1.51.1.5 · seamless-neoforge-1.21.1-1.1.5.jar (main file)Beta·17 Feb 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Beta · 211.3 KB
    1.21.1·Fabric, Quilt1.1.51.1.5 · seamless-fabric-1.21.1-1.1.5.jar (main file)Beta·17 Feb 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Beta · 206.8 KB
    1.21.11·NeoForge1.1.51.1.5 · seamless-neoforge-1.21.11-1.1.5.jar (main file)Beta·17 Feb 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Beta · 2.8 MB
    1.21.11·Fabric, Quilt1.1.51.1.5 · seamless-fabric-1.21.11-1.1.5.jar (main file)Beta·17 Feb 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Beta · 2.8 MB
    1.21.10·Fabric, Quilt1.1.51.1.5 · seamless-fabric-1.21.10-1.1.5.jar (main file)·17 Feb 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.8 MB
    1.21.10·NeoForge1.1.51.1.5 · seamless-neoforge-1.21.10-1.1.5.jar (main file)·17 Feb 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.8 MB
    1.21.1·Fabric, Quilt1.0.101.0.10 · seamless-fabric-1.21.1-1.0.10.jar (main file)·11 Feb 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 246.4 KB
    1.21.1·NeoForge1.0.101.0.10 · seamless-neoforge-1.21.1-1.0.10.jar (main file)·11 Feb 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 248.8 KB
    1.21.11·NeoForge1.0.101.0.10 · seamless-neoforge-1.21.11-1.0.10.jar (main file)·11 Feb 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 248.8 KB
    1.21.11·Fabric, Quilt1.0.101.0.10 · seamless-fabric-1.21.11-1.0.10.jar (main file)·11 Feb 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 246.3 KB
    1.21.10·NeoForge1.0.81.0.8 · seamless-neoforge-1.21.10-1.0.8.jar (main file)·11 Feb 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 248.8 KB
    1.21.10·NeoForge1.0.51.0.5 · seamless-neoforge-1.21.10-1.0.5.jar (main file)·7 Feb 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 247.0 KB
    1.21.10·Fabric, Quilt1.0.51.0.5 · seamless-fabric-1.21.10-1.0.5.jar (main file)·7 Feb 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 246.3 KB
    1.21.10·NeoForge1.0.01.0.0 · seamless-neoforge-1.21.10-1.0.0.jar (main file)Beta·5 Feb 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthNot on CurseForgeDownload · Beta · 247.0 KB
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