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    2,024,305 files checkedFiles from Modrinth and CurseForge we downloaded and checked. Counted on 24 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 24 Oct 2026.269,486 projects gradedProjects with a letter from A to F. Counted on 24 Oct 2026.
    How it worksMalware we foundAPIAboutPrivacyTermsContact

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

    HammerLib

    Mod

    A shared library that other mods need to work properly.

    A99/ 100
    • OverviewA
    • SecurityPassed
    • PrivacyGoes online
    • AINone found
    • CompatibilityUp to 1.21.4
    • ModpacksIn 9,873
    • ReleasesLatest 25 Sep

    Download

    HammerLib-1.21.4-21.4.5.jar

    Released 5 Mar 2025 · 2.4 MB

    Passed: our checks found nothing harmful in this file.

    Download
    OverviewSecurityPrivacyAICompatibilityModpacksReleases

    Why grade A

    How grades work

    Strengths

    • Stable releases
    • Public source code and issue tracker
    • Widely used
    • Around for years

    Points lost

    • Releases in only 7 of the last 24 months−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.4 weeks ago (25 Sep 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.1.21.4 on NeoForge, 1.20.1 on Forge. 15% or more of the popular mods updated in the last 6 months also have files for 1.21.1. 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 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.39 of the 378 modpacks with two or more versions removed it in a later one (10%) 10 / 10
      Quick fixesHow often a release needed a quick fix: a new release within 3 days to fix a problem in it.3 of its 29 releases in 2 years needed a quick fix (10%) 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 · dragon-forge/HammerLib 7 / 7
      Place to report problemsWhether the project page links to a place where players can report problems: an issue tracker.GitHub issues · dragon-forge/HammerLib 3 / 3

    • Popularity

      Full points4 / 4
      DownloadsDownloads on Modrinth and CurseForge. Full points from 5 million.58,983,023 4 / 4

    • Track record

      Full points8 / 8
      AgeHow long the project has existed. It counts less when no new file came out recently.10.0 years, 325 releases 8 / 8

    • Security

      Passed
      File checksThis check adds no points. It can only take points away.Our checks found nothing harmful in all 3 latest files for recent Minecraft versions. See Security
    Total99 / 100

    70 of the 71 points that apply = 99 out of 100.

    Images

    • mcdoc.zeith.org

    About

    HammerLib is a library for Minecraft mod developers, used by DragonForge team mods and available as a dependency for other mods. It provides annotation-based registration for blocks and related items, BlockEntity renderers, custom model loaders, and tags, as well as Java-based recipe registration. Its development APIs also cover networking and packet handling, NBT serialization and synchronization, block harvesting, and BlockEntity containers that avoid separate menu-type registration. Additional utilities include reading colors from item textures and loading legacy key-value language files.

    Written from Modrinth and CurseForge . How we write it

    In-game changes

    Changes the game's code in 10 areas, as a library other mods build on: Rendering and graphicsChanges 8 game code files in this area: drawing mobs, items, particles and textures on screen., Server and world logicChanges 4 game code files in this area: the world, commands, scoreboards, saved data and game rules., Inventory and itemsChanges 4 game code files in this area: items, chests and other containers, crafting and enchanting., User interfaceChanges 3 game code files in this area: menus, screens, tooltips, the chat window and the in-game overlay., Game data and resourcesChanges 2 game code files in this area: recipes, tags, advancements, language files and other game data., Game coreChanges 2 game code files in this area: the main loop, lighting and other code the whole game uses., Chunk loading and storageChanges 1 game code file in this area: how the game loads, tracks, saves and unloads chunks., Networking and multiplayerChanges 1 game code file in this area: connections, the server list and what is sent between your game and a server., Mobs and their behaviorChanges 1 game code file in this area: mobs, animals, villagers, projectiles and how they move and act. and Blocks and fluidsChanges 1 game code file in this area: how blocks, fluids and redstone work..

    Adds 1 recipe.

    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 29
    Thermal FoundationCThermal ExpansionCBotaniaAMekanism GeneratorsBImmersive EngineeringC

    Details

    Creators
    Zeith and Sora-Canstavia
    License
    All rights reserved
    Downloads
    59M
    Created
    14 Jul 2016
    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.
    Starts other programs
    It can start another program on your computer. It can read system or hardware information and run a command line.
    Connects to the internet
    It has code that can go online, for example to check for updates, load skins or send crash reports. It contacts 1 web address. See Privacy
    Creates settings files
    The mod keeps its settings in the config folder of your game, where you can change or delete them. 1 file 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 23 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.
      23 latest files: the newest file for each Minecraft version and loader. The answer above is about the 3 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.
    • 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

    We found nothing it sends about you

    We read its code without running it: it contacts 1 web address while you play.

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

    Its files for older Minecraft versions (1.10.2 to 1.12.2) also send unknown data, what you type in its screens, your player name and crash reports.

    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 3 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 3 files, for recent Minecraft versions. See each file in Releases
    • Address built while the game runsThe code builds this address while the game runs: it is not written in the file.
      Purpose not known.
    • 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
      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
      17 images 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
      994 code files read

    Compatibility

    See all 325 files
    NeoForge
    Forge
    1.101.141.171.2026.1

    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 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.Its newest file is for 1.21.4. It has no file for the 6 newer Minecraft versions. It also supports 1.21.1, a version many recently updated mods still support.

    Related projects

    Projects that need HammerLib to work.

    ProjectTypeDownloadsGrade
    Solar Flux RebornCMod44.3M downloadsExpanded EquivalenceDMod10.8M downloadsBotanic AdditionsBMod9.1M downloadsImprovable SkillsCMod5.6M downloadsThaumic Additions: ReconstructedDMod4.2M downloadsSimple QuarryCMod2.1M downloadsRelics: Arcane AbilitiesBMod1.3M downloadsHammerAnimationsAMod880K downloadsTerrariaCraft 🌳EMod659K downloadsMusicLayerEMod489K downloads
    1 to 10 of 53123456

    Modpacks using this project

    Find modpacks with it
    Modpacks that released a new version with this project, each month
    4002000
    Oct 2024: 317 modpacksNov 2024: 296 modpacksDec 2024: 320 modpacksJan 2025: 325 modpacksFeb 2025: 316 modpacksMar 2025: 272 modpacksApr 2025: 314 modpacksMay 2025: 323 modpacksJun 2025: 293 modpacksJul 2025: 296 modpacksAug 2025: 280 modpacksSep 2025: 234 modpacksOct 2025: 262 modpacksNov 2025: 289 modpacksDec 2025: 277 modpacksJan 2026: 280 modpacksFeb 2026: 231 modpacksMar 2026: 222 modpacksApr 2026: 208 modpacksMay 2026: 225 modpacksJun 2026: 230 modpacksJul 2026: 221 modpacksAug 2026: 234 modpacksSep 2026: 209 modpacks
    Oct 2024Oct 2025Sep 2026
    Modpacks that released a new version with this project, each month
    Oct 2024317
    Nov 2024296
    Dec 2024320
    Jan 2025325
    Feb 2025316
    Mar 2025272
    Apr 2025314
    May 2025323
    Jun 2025293
    Jul 2025296
    Aug 2025280
    Sep 2025234
    Oct 2025262
    Nov 2025289
    Dec 2025277
    Jan 2026280
    Feb 2026231
    Mar 2026222
    Apr 2026208
    May 2026225
    Jun 2026230
    Jul 2026221
    Aug 2026234
    Sep 2026209

    9,873 modpacks include HammerLib in at least one of their versions. Here are the 30 most downloaded.

    ModpackDownloadsLast version with it
    FTB Presents SkyFactory 36.8M downloadslast version with it 10 Dec 2021All the Mods 6 - ATM66.5M downloadslast version with it 24 Jan 2024MC Eternal4.9M downloadslast version with it 16 Dec 2024Crazy Craft Updated4.5M downloadslast version with it 18 Oct 2026FTB Presents Stoneblock 24.4M downloadslast version with it 28 Oct 2019Project Ozone 3 A New Way Forward3.2M downloadslast version with it 16 Jan 2023All the Mods 9 - To the Sky - atm9sky3.1M downloadslast version with it 7 Jun 2024Dungeons, Dragons and Space Shuttles3M downloadslast version with it 8 Oct 2020SteamPunk [LPS]3M downloadslast version with it 20 May 2026FTB Beyond2.3M downloadslast version with it 24 Aug 2017
    1 to 10 of 30123

    Often in the same modpacks

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

    ProjectTypeShareGrade
    Thermal FoundationCModin 59% of the modpacks with HammerLibThermal ExpansionCModin 57% of the modpacks with HammerLibBotaniaAModin 56% of the modpacks with HammerLibMekanism GeneratorsBModin 54% of the modpacks with HammerLibImmersive EngineeringCModin 51% of the modpacks with HammerLibMystical AgricultureAModin 50% of the modpacks with HammerLibEnder Storage 1.8.+CModin 50% of the modpacks with HammerLibMekanism ToolsBModin 49% of the modpacks with HammerLibElevatorModAModin 48% of the modpacks with HammerLibIndustrial ForegoingAModin 47% of the modpacks with HammerLib
    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
    1.21.4·NeoForge21.4.521.4.5 · HammerLib-1.21.4-21.4.5.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21 to 1.21.1·NeoForge21.0.1721.0.17 · HammerLib-1.21-21.0.17.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.20.1·NeoForge, Forge20.1.5020.1.50 · HammerLib-1.20.1-20.1.50.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    Older Minecraft versions
    1.20.6·NeoForge20.6.3020.6.30 · HammerLib-1.20.6-20.6.30.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.20.5·NeoForge20.5.2920.5.29 · HammerLib-1.20.5-20.5.29.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.20.4·NeoForge20.4.2920.4.29 · HammerLib-1.20.4-20.4.29.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.20.3·NeoForge20.3.2920.3.29 · HammerLib-1.20.3-20.3.29.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.20.2·NeoForge20.2.2920.2.29 · HammerLib-1.20.2-20.2.29.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.20·Forge20.0.820.0.8 · HammerLib-1.20-20.0.8.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.19.3·Forge19.5.5719.5.57 · HammerLib-1.19.3-19.5.57.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1 to 10 of 23123

    325 releases

    MinecraftLoaderVersionReleasedSecurityGet it onDownload
    1.21 to 1.21.11.21 to 1.21.1The latest file for its Minecraft version and loader·NeoForge21.0.1721.0.17 · HammerLib-1.21-21.0.17.jar (main file)·25 Sep 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.3 MB
    1.21 to 1.21.11.21 to 1.21.1·NeoForge21.0.1621.0.16 · HammerLib-1.21-21.0.16.jar (main file)·15 Sep 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.3 MB
    1.21 to 1.21.11.21 to 1.21.1·NeoForge21.0.1521.0.15 · HammerLib-1.21-21.0.15.jar (main file)·9 Sep 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.1 MB
    1.12.2The latest file for its Minecraft version and loader·Forge12.2.6612.2.66 · HammerLib-1.12.2-12.2.66.jar (main file)·14 Jul 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.5 MB
    1.12.2·Forge12.2.6512.2.65 · HammerLib-1.12.2-12.2.65.jar (main file)·27 Jun 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.5 MB
    1.12.2·Forge12.2.6312.2.63 · HammerLib-1.12.2-12.2.63.jar (main file)·13 Jun 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.5 MB
    1.12.2·Forge12.2.6212.2.62 · HammerLib-1.12.2-12.2.62.jar (main file)·7 Jun 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.5 MB
    1.12.2·Forge12.2.6112.2.61 · HammerLib-1.12.2-12.2.61.jar (main file)·3 Jun 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.5 MB
    1.12.2·Forge12.2.6012.2.60 · HammerLib-1.12.2-12.2.60.jar (main file)·1 Jun 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.4 MB
    1.12.2·Forge12.2.5912.2.59 · HammerLib-1.12.2-12.2.59.jar (main file)·31 May 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.4 MB
    1.12.2·Forge12.2.5812.2.58 · HammerLib-1.12.2-12.2.58.jar (main file, 2 other files in this version not shown)·26 Mar 2025PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.5 MB
    1.20.1The latest file for its Minecraft version and loader·Forge, NeoForge20.1.5020.1.50 · HammerLib-1.20.1-20.1.50.jar (main file)·23 Mar 2025PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.3 MB
    1.21.4The latest file for its Minecraft version and loader·NeoForge21.4.521.4.5 · HammerLib-1.21.4-21.4.5.jar (main file)·5 Mar 2025PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.4 MB
    1.21.4·NeoForge21.4.421.4.4 · HammerLib-1.21.4-21.4.4.jar (main file)·5 Mar 2025PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.4 MB
    1.21.4·NeoForge21.4.321.4.3 · HammerLib-1.21.4-21.4.3.jar (main file)·5 Mar 2025PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.4 MB
    1.21.4·NeoForge21.4.221.4.2 · HammerLib-1.21.4-21.4.2.jar (main file)·4 Mar 2025PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.4 MB
    1.21.4·NeoForge21.4.121.4.1 · HammerLib-1.21.4-21.4.1.jar (main file)·4 Mar 2025PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.2 MB
    1.20.1·Forge, NeoForge20.1.4820.1.48 · HammerLib-1.20.1-20.1.48.jar (main file)·18 Jan 2025PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.3 MB
    1.20.1·NeoForge20.1.4720.1.47 · HammerLib-1.20.1-20.1.47.jar (main file)·18 Jan 2025PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.3 MB
    1.20.1·NeoForge20.1.4620.1.46 · HammerLib-1.20.1-20.1.46.jar (main file)·18 Jan 2025PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.3 MB
    1 to 20 of 32512345…17

    Quick fixes

    In the last 2 years, 3 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.3

    • [1.12.2] HammerLib - 12.2.601 Jun 2026…Changes: 12.2.60 - Fix crashing with ThaumicAdditions. (Close #86)…
    • [1.20.1] HammerLib - 20.1.4718 Jan 2025…ObjectMirrorConverter.unwrap Fix FluidFactory.is(Fluid)
    • [1.20.1] HammerLib - 20.1.3624 Dec 2024…b5eb83d47affb30) by Zeith [1.21.4] Fixed glint!…