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    2,056,262 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 2026.269,829 projects gradedProjects with a letter from A to F. Counted on 25 Oct 2026.
    How it worksMalware we foundWhat's newAPIAboutPrivacyTermsContact

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

    Polymer

    Mod

    Library for creating better server side content!

    A99/ 100
    Security
    Passed
    Privacy
    Goes online
    Runs on
    Server, client optional
    Loaders
    Fabric, Quilt
    Minecraft versions
    Up to 26.3
    • OverviewA
    • SecurityPassed
    • PrivacyGoes online
    • AINone found
    • CompatibilityUp to 26.3
    • ModpacksIn 2,115
    • ReleasesLatest 24 Oct

    Download

    polymer-bundled-0.18.5+26.3.jar

    Released 24 Oct 2026 · 1.4 MB

    Passed: our checks found nothing harmful in this file.

    Download
    OverviewSecurityPrivacyAICompatibilityModpacksReleases

    Why grade A

    How grades work

    Strengths

    • Security checks passed
    • Regular releases for the newest Minecraft versions
    • Stable releases
    • Public source code and issue tracker
    • Widely used

    Points lost

    No points lost.

    All 11 criteria

    • Maintenance

      Full points27 / 27
      Last releaseHow long ago the newest file came out, or an existing file was marked as working on a new Minecraft version.Yesterday (24 Oct 2026) 12 / 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.26.3 (latest) on Fabric, 1.21.11 on Quilt 9 / 9
      Regular releasesIn how many of the last 24 months a new file came out. Full points at 8 months.Releases every month for 2 years 6 / 6

    • Stability

      Full points22 / 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.38 of the 352 modpacks with two or more versions removed it in a later one (11%) 10 / 10
      Quick fixesHow often a release needed a quick fix: a new release within 3 days to fix a problem in it.2 of its 74 releases in 2 years needed a quick fix (3%) 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 of the 3 known conflicts count in the grade See the 3 known conflicts5 / 5

    • Transparency

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

    • Popularity

      Full points4 / 4
      DownloadsDownloads on Modrinth and CurseForge. Full points from 5 million.8,194,223 4 / 4

    • Track record

      Full points8 / 8
      AgeHow long the project has existed. It counts less when no new file came out recently.4.9 years, 278 releases 8 / 8

    • Security

      Passed
      File checksThis check adds no points. It can only take points away.Our checks found nothing harmful in all 15 latest files for recent Minecraft versions. See Security
    Total99 / 100

    70.7 of the 71 points that apply = 99.6, so 99 out of 100: only a project that lost no point gets 100. The points above are rounded to whole numbers.

    About

    Polymer is a library for developers to create server-side Minecraft content, including custom blocks, items, and entities that function on the server and can be used by players without installing the content mod or requiring a resource pack. These objects remain registered as their own custom content on the server while being presented to clients through compatible vanilla or modded representations, supporting integration with datapacks and other mods. Developers can tailor client-side item and block appearances, including player-specific block representations, and create server-synced creative item groups. The library also supports server-side custom sounds, statistics, and status effects, with custom sounds falling back to vanilla sounds for players without the relevant resource pack. Polymer includes compatibility utilities for client-side mods such as EMI, Just Enough Items, Roughly Enough Items, WTHIT, Jade, and AppleSkin, along with synced creative tabs and accurate F3 debug information. For servers using Polymer content that includes resource packs, its AutoHost module can generate and host packs and apply them to clients automatically. Polymer does not automatically convert existing mods into server-side content; that requires developers to adapt them with code.

    Written from Modrinth , CurseForge and the GitHub README . How we write it

    In-game changes

    Changes the game's code in 13 areas, as a library other mods build on: Networking and multiplayerChanges 36 game code files in this area: connections, the server list and what is sent between your game and a server., Inventory and itemsChanges 20 game code files in this area: items, chests and other containers, crafting and enchanting., Game coreChanges 14 game code files in this area: the main loop, lighting and other code the whole game uses., Chunk loading and storageChanges 11 game code files in this area: how the game loads, tracks, saves and unloads chunks., Blocks and fluidsChanges 7 game code files in this area: how blocks, fluids and redstone work., Rendering and graphicsChanges 7 game code files in this area: drawing mobs, items, particles and textures on screen., Mobs and their behaviorChanges 6 game code files in this area: mobs, animals, villagers, projectiles and how they move and act., PlayerChanges 5 game code files in this area: your character: movement, abilities, hunger and controls., Game data and resourcesChanges 4 game code files in this area: recipes, tags, advancements, language files and other game data., User interfaceChanges 4 game code files in this area: menus, screens, tooltips, the chat window and the in-game overlay., Server and world logicChanges 3 game code files in this area: the world, commands, scoreboards, saved data and game rules., Game optionsChanges 2 game code files in this area: settings, key bindings and the option screens. and World renderingChanges 2 game code files in this area: drawing the terrain, sky, clouds and weather..

    Libraries packed inside it change 9 more game code files: Polymer (Networking), Packet Tweaker and Polymer (Registry Sync Manipulator).

    Adds no new blocks, items or other content.

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

    Details

    Creator
    Patbox
    License
    GNU Lesser General Public License v3.0 only
    Downloads
    8.2M
    Created
    2 Dec 2021
    Official pages
    Modrinth , CurseForge
    Links
    Source code , Issues , Wiki , 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 Polymer (Auto Host), a library it includes.
    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 5 libraries it includes. See Privacy

    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 15 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.
      32 latest files: the newest file for each Minecraft version and loader. The answer above is about the 15 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.
    • Accepts connections from other computers
      Runs a small web server.
    • Looked for, not foundWe looked for these in the file and did not find them.
      Folders outside the game, other programs, 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 2 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 15 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 15 files, for recent Minecraft versions. See each file in Releases
    • piston-data.mojang.com
      Purpose not known.From a bundled library.
    • resources.download.minecraft.net
      Purpose not known.From a bundled library.
    • 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

    No sign that AI was used to make it

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

    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 · 6 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.
    • Code historyThe public code on GitHub: who made each change, credit lines such as "Co-authored-by", and its files.
      Nothing found
    • 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
      37 of 40 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
      1 image read
    • 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
      710 code files read

    Compatibility

    See all 278 files
    Fabric
    Quilt
    1.181.201.2126.1

    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 on the server. If your game has it too, you get extra features.
    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.Faster than most mods. On average, it gets a file 1 day after a new Minecraft version comes out. Measured on the last 6 Minecraft versions.

    Known conflicts

    These projects do not work together with Polymer: their authors or Polymer's author say so. If you install both, the game can crash or some features can stop working. Some of them do the same job as Polymer, so you only need one.

    ProjectTypeDownloadsDeclared by
    CardboardMod246K downloadsdeclared by Polymerskeep's Cardboard ModMod3.6K downloadsdeclared by PolymerCreate's-cardboardMod1.4K downloadsdeclared by Polymer

    Related projects

    174 projects need Polymer to work. Here are the 100 most downloaded.

    ProjectTypeDownloadsGrade
    Universal GravesAMod12.5M downloadsUniversal ShopsAMod4M downloadsCobblemon - More SparklesAMod967K downloadsfilamentAMod400K downloadsPatbox's BreweryAMod344K downloadsToms Server Additions: Decorations & FurnitureAMod262K downloadsDaycare+AMod221K downloadsToms MobsAMod221K downloadsGet Off My Lawn ReServedAMod220K downloadsPolyDecorationsAMod183K downloads
    1 to 10 of 10012345…10

    Modpacks using this project

    Find modpacks with it
    Modpacks that released a new version with this project, each month
    3001500
    Oct 2024: 75 modpacksNov 2024: 82 modpacksDec 2024: 97 modpacksJan 2025: 121 modpacksFeb 2025: 124 modpacksMar 2025: 124 modpacksApr 2025: 134 modpacksMay 2025: 130 modpacksJun 2025: 110 modpacksJul 2025: 114 modpacksAug 2025: 143 modpacksSep 2025: 121 modpacksOct 2025: 150 modpacksNov 2025: 190 modpacksDec 2025: 217 modpacksJan 2026: 265 modpacksFeb 2026: 240 modpacksMar 2026: 200 modpacksApr 2026: 160 modpacksMay 2026: 163 modpacksJun 2026: 176 modpacksJul 2026: 165 modpacksAug 2026: 184 modpacksSep 2026: 188 modpacks
    Oct 2024Oct 2025Sep 2026
    Modpacks that released a new version with this project, each month
    Oct 202475
    Nov 202482
    Dec 202497
    Jan 2025121
    Feb 2025124
    Mar 2025124
    Apr 2025134
    May 2025130
    Jun 2025110
    Jul 2025114
    Aug 2025143
    Sep 2025121
    Oct 2025150
    Nov 2025190
    Dec 2025217
    Jan 2026265
    Feb 2026240
    Mar 2026200
    Apr 2026160
    May 2026163
    Jun 2026176
    Jul 2026165
    Aug 2026184
    Sep 2026188

    2,115 modpacks include Polymer in at least one of their versions. Here are the 30 most downloaded.

    ModpackDownloadsLast version with it
    Better MC [FABRIC] - BMC25.9M downloadslast version with it 15 Jul 2026Better Adventures+2.2M downloadslast version with it 13 Sep 2026Better MC [FABRIC] BMC31.5M downloadslast version with it 26 Oct 2024Landscapes Reimagined Genesis1.1M downloadslast version with it 2 Aug 2024Better OneBlock [One Block]784K downloadslast version with it 27 Jan 2026Servidor Jornadas Cobblemon695K downloadslast version with it 21 Oct 2026All of Fabric 7 - AOF7657K downloadslast version with it 22 Oct 2023Another Quality Modpack 2 - AQM2628K downloadslast version with it 4 Sep 2025Cobblemon Academy 2.0524K downloadslast version with it 23 Sep 2026Medieval MC [FABRIC] MMC3441K downloadslast version with it 15 Sep 2024
    1 to 10 of 30123

    Often in the same modpacks

    Mods that modpacks often add together with Polymer. Share: how many of the modpacks with Polymer also have that mod.

    ProjectTypeShareGrade
    Mod MenuAModin 82% of the modpacks with PolymerLithiumAModin 74% of the modpacks with PolymerFerriteCoreAModin 73% of the modpacks with PolymerSodium ExtraAModin 55% of the modpacks with PolymerChat HeadsAModin 55% of the modpacks with PolymerReese's Sodium OptionsAModin 53% of the modpacks with PolymerLambDynamicLights - Dynamic LightsAModin 49% of the modpacks with PolymerFarmer's Delight RefabricatedAModin 46% of the modpacks with PolymerFalling LeavesAModin 44% of the modpacks with PolymerBetterF3AModin 44% of the modpacks with Polymer
    1 to 10 of 29123

    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
    26.3·Fabric0.18.50.18.5 · polymer-bundled-0.18.5+26.3.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    26.3·Fabric0.18.40.18.4 · polymer-bundled-0.18.4+26.3.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    26.2·Fabric0.17.50.17.5 · polymer-bundled-0.17.5+26.2.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    26.1 to 26.1.2·Fabric0.16.50.16.5 · polymer-bundled-0.16.5+26.1.2.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.11·Fabric, Quilt0.15.20.15.2 · polymer-bundled-0.15.2+1.21.11.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.10·Fabric, Quilt0.14.40.14.4 · polymer-bundled-0.14.4+1.21.10.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.9·Fabric, Quilt0.14.20.14.2 · polymer-bundled-0.14.2+1.21.9.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.8·Fabric, Quilt0.13.130.13.13 · polymer-bundled-0.13.13+1.21.8.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.7·Fabric, Quilt0.13.70.13.7 · polymer-bundled-0.13.7+1.21.8.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.7·Fabric, Quilt0.13.60.13.6 · polymer-bundled-0.13.6+1.21.7.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1 to 10 of 321234

    278 releases

    MinecraftLoaderVersionReleasedSecurityGet it onDownload
    26.3The latest file for its Minecraft version and loader·Fabric0.18.50.18.5 · polymer-bundled-0.18.5+26.3.jar (main file)·24 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthNot on CurseForgeDownload · Stable · 1.4 MB
    26.3The latest file for its Minecraft version and loader·Fabric0.18.40.18.4 · polymer-bundled-0.18.4+26.3.jar (main file)·11 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 1.4 MB
    26.3·Fabric0.18.30.18.3 · polymer-bundled-0.18.3+26.3.jar (main file)·10 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 1.3 MB
    26.3·Fabric0.18.20.18.2 · polymer-bundled-0.18.2+26.3.jar (main file)·18 Sep 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 1.3 MB
    26.3·Fabric0.18.10.18.1 · polymer-bundled-0.18.1+26.3.jar (main file)·17 Sep 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 1.3 MB
    26.3·Fabric0.18.0-rc-10.18.0-rc-1 · polymer-bundled-0.18.0+26.3-rc-1.jar (main file)·10 Sep 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 1.3 MB
    26.2The latest file for its Minecraft version and loader·Fabric0.17.50.17.5 · polymer-bundled-0.17.5+26.2.jar (main file)·1 Sep 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 1.3 MB
    26.2·Fabric0.17.40.17.4 · polymer-bundled-0.17.4+26.2.jar (main file)·22 Aug 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 1.3 MB
    26.2·Fabric0.17.30.17.3 · polymer-bundled-0.17.3+26.2.jar (main file)·11 Jul 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 1.3 MB
    26.2·Fabric0.17.20.17.2 · polymer-bundled-0.17.2+26.2.jar (main file)·7 Jul 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthNot on CurseForgeDownload · Stable · 1.3 MB
    26.2·Fabric0.17.10.17.1 · polymer-bundled-0.17.1+26.2.jar (main file)·27 Jun 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthNot on CurseForgeDownload · Stable · 1.3 MB
    26.2·Fabric0.17.0-rc-20.17.0-rc-2 · polymer-bundled-0.17.0+26.2-rc-2.jar (main file)·14 Jun 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 1.3 MB
    26.1 to 26.1.226.1 to 26.1.2The latest file for its Minecraft version and loader·Fabric0.16.50.16.5 · polymer-bundled-0.16.5+26.1.2.jar (main file)·14 May 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 1.3 MB
    26.1 to 26.1.226.1 to 26.1.2·Fabric0.16.40.16.4 · polymer-bundled-0.16.4+26.1.2.jar (main file)·29 Apr 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 1.3 MB
    26.1 to 26.1.226.1 to 26.1.2·Fabric0.16.30.16.3 · polymer-bundled-0.16.3+26.1.2.jar (main file)·15 Apr 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 1.3 MB
    26.1 to 26.1.226.1 to 26.1.2·Fabric0.16.20.16.2 · polymer-bundled-0.16.2+26.1.1.jar (main file)·8 Apr 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 1.3 MB
    26.1 to 26.1.126.1 to 26.1.1·Fabric0.16.10.16.1 · polymer-bundled-0.16.1+26.1.1.jar (main file)·5 Apr 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 1.3 MB
    26.1 to 26.1.126.1 to 26.1.1·Fabric0.16.00.16.0 · polymer-bundled-0.16.0+26.1.1.jar (main file)·2 Apr 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 1.3 MB
    26.1·Fabric0.16.0-pre.40.16.0-pre.4 · polymer-bundled-0.16.0-pre.4+26.1.jar (main file)Beta·28 Mar 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Beta · 1.3 MB
    26.1·Fabric0.16.0-pre.30.16.0-pre.3 · polymer-bundled-0.16.0-pre.3+26.1.jar (main file)Beta·26 Mar 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Beta · 1.3 MB
    1 to 20 of 27812345…14

    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
    • 0.16.0-pre.2+26.1-rc-222 Mar 2026What's Changed fix: fails rp generation when polymer folder does not exist…
    • 0.14.2+1.21.94 Oct 2025