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    2,053,304 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 2026.269,472 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.

    KotlinLangForge

    Mod

    Lets Forge and NeoForge mods use Kotlin for their code.

    A99/ 100
    • OverviewA
    • SecurityPassed
    • PrivacyNone found
    • AINone found
    • CompatibilityUp to 26.3
    • ModpacksIn 532
    • ReleasesLatest 20 Oct

    Download

    KotlinLangForge-2.16.0-k2.4.21-3.1+neoforge.jar

    Released 20 Oct 2026 · 7.9 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.4 days ago (20 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 NeoForge, 1.20.4 on Forge 9 / 9
      Regular releasesIn how many of the last 24 months a new file came out. Full points at 8 months.Releases in 23 of the last 24 months 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.22 of the 328 modpacks with two or more versions removed it in a later one (7%) 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 43 releases in 2 years needed a quick fix (5%) 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 · btwonion/KotlinLangForge 7 / 7
      Place to report problemsWhether the project page links to a place where players can report problems: an issue tracker.GitHub issues · btwonion/KotlinLangForge 3 / 3
    • Popularity

      Full points4 / 4
      DownloadsDownloads on Modrinth and CurseForge. Full points from 5 million.2,112,113 4 / 4
    • Track record

      Full points8 / 8
      AgeHow long the project has existed. It counts less when no new file came out recently.2.0 years, 214 releases 8 / 8
    • Security

      Passed
      File checksThis check adds no points. It can only take points away.Our checks found nothing harmful in all 4 latest files for recent Minecraft versions. See Security
    Total99 / 100

    70.8 of the 71 points that apply = 99.7, so 99 out of 100: only a project that lost no point gets 100. The points above are rounded to whole numbers.

    About

    KotlinLangForge provides a Kotlin language adapter that lets mod developers write and initialize Forge or NeoForge mods using Kotlin. It also bundles Kotlin standard-library and reflection support, along with kotlinx libraries for serialization, coroutines, date and time, I/O, and atomic operations. For event handling, developers can mark classes or files for automatic listener registration, with annotations to subscribe to events and a mod event bus available through the adapter.

    Written from Modrinth . How we write it

    In-game changes

    Adds no new blocks, items or other content.

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

    Often used with it

    See all 29
    LithiumAChat HeadsAsparkAChunkyAReese's Sodium OptionsA

    Details

    Creator
    btwonion
    License
    GNU General Public License v3.0 only
    Downloads
    2.1M
    Created
    12 Oct 2024
    Official pages
    Modrinth , CurseForge
    Links
    Source code , 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

    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 3 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 8 latest files checked, last on 20 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.
      8 latest files: the newest file for each Minecraft version and loader. The answer above is about the 4 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, other programs, updating itself, the webcam or microphone, an AI service.

    Privacy

    We found nothing it sends

    We read its code without running it: it contacts no web address while you play.

    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 4 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 4 files, for recent Minecraft versions. See each file in Releases
    • 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
      18 code files read

    Compatibility

    See all 214 files
    NeoForge
    Forge
    1.161.191.2126.1

    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.Works in your game or on a server. With both, 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.
    Preloading Trickson ForgeA
    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 21 days after a new Minecraft version comes out. Measured on the last 6 Minecraft versions.

    Related projects

    31 projects need KotlinLangForge to work. Here are the 30 most downloaded.

    ProjectTypeDownloadsGrade
    Fzzy ConfigAMod139.4M downloadsZoomify (Zoom)AMod116.3M downloadsVeinMinerAMod101.7M downloadsVeinMiner HotkeyAMod73.8M downloadsParticle CoreAMod55.6M downloadsMore Enchantment InfoBMod3.1M downloadsTalk BalloonsBMod529K downloadsModern NetworkingAMod446K downloadsBetter Boat MovementAMod202K downloadsEthan's Kotlin ExtensionsBMod138K downloads
    1 to 10 of 30123

    Modpacks using this project

    Find modpacks with it
    Modpacks that released a new version with this project, each month
    2001000
    Oct 2024: 0 modpacksNov 2024: 0 modpacksDec 2024: 0 modpacksJan 2025: 0 modpacksFeb 2025: 0 modpacksMar 2025: 2 modpacksApr 2025: 2 modpacksMay 2025: 5 modpacksJun 2025: 4 modpacksJul 2025: 3 modpacksAug 2025: 5 modpacksSep 2025: 7 modpacksOct 2025: 6 modpacksNov 2025: 14 modpacksDec 2025: 23 modpacksJan 2026: 31 modpacksFeb 2026: 33 modpacksMar 2026: 29 modpacksApr 2026: 23 modpacksMay 2026: 38 modpacksJun 2026: 76 modpacksJul 2026: 116 modpacksAug 2026: 121 modpacksSep 2026: 144 modpacks
    Oct 2024Oct 2025Sep 2026
    Modpacks that released a new version with this project, each month
    Oct 20240
    Nov 20240
    Dec 20240
    Jan 20250
    Feb 20250
    Mar 20252
    Apr 20252
    May 20255
    Jun 20254
    Jul 20253
    Aug 20255
    Sep 20257
    Oct 20256
    Nov 202514
    Dec 202523
    Jan 202631
    Feb 202633
    Mar 202629
    Apr 202623
    May 202638
    Jun 202676
    Jul 2026116
    Aug 2026121
    Sep 2026144

    More modpacks put it in their new versions than a year ago: 86 a month now, 4 a year agoThe average of the last 6 months, compared with the same 6 months a year before. We say it only when the change is large..

    532 modpacks include KotlinLangForge in at least one of their versions. Here are the 30 most downloaded.

    ModpackDownloadsLast version with it
    Rapid Optimization463K downloadslast version with it 18 Oct 2026Create Stellar187K downloadslast version with it 23 Oct 2026Intermediate Version - Vanilla+ for Minecraft 26.1.2!150K downloadslast version with it 12 Jul 2026All Of Create97K downloadslast version with it 10 Oct 2026The Forgotten Script (The Broken Script)69K downloadslast version with it 3 Jan 2026Cobblemon Clumpy Bros Modpack67K downloadslast version with it 9 Oct 2026Create Eternal Journey57K downloadslast version with it 7 Aug 2026香草精华 Vanilla Essence50K downloadslast version with it 26 Mar 2026Create: Complete by Shalz43K downloadslast version with it 15 Sep 2026Immersive Experience - Inspired by Actions & Stuff and Other Immersive Mods42K downloadslast version with it 24 Sep 2026
    1 to 10 of 30123

    Often in the same modpacks

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

    ProjectTypeShareGrade
    LithiumAModin 58% of the modpacks with KotlinLangForgeChat HeadsAModin 49% of the modpacks with KotlinLangForgesparkAModin 42% of the modpacks with KotlinLangForgeChunkyAModin 40% of the modpacks with KotlinLangForgeReese's Sodium OptionsAModin 40% of the modpacks with KotlinLangForgeBadOptimizationsAModin 40% of the modpacks with KotlinLangForgeSophisticated StorageAModin 40% of the modpacks with KotlinLangForgeCreate: Copycats+AModin 39% of the modpacks with KotlinLangForgeComplementary Shaders - UnboundAShaderin 37% of the modpacks with KotlinLangForgeLambDynamicLights - Dynamic LightsAModin 36% of the modpacks with KotlinLangForge
    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
    1.21.9 to 26.3·NeoForge2.16.0-k2.4.21-3.12.16.0-k2.4.21-3.1 · KotlinLangForge-2.16.0-k2.4.21-3.1+neoforge.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.20.5 to 1.21.8·NeoForge2.16.0-k2.4.21-3.02.16.0-k2.4.21-3.0 · KotlinLangForge-2.16.0-k2.4.21-3.0+neoforge.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.17.1 to 1.20.4·Forge2.16.0-k2.4.21-2.02.16.0-k2.4.21-2.0 · KotlinLangForge-kff-compat-2.16.0-k2.4.21-2.0+forge.jarSends: None foundRequires:Preloading TricksPassedOur checks found nothing harmful in this file. Its code was read too.
    1.18.2 to 1.20.1·NeoForge2.11.2-k2.3.20-2.02.11.2-k2.3.20-2.0 · KotlinLangForge-2.11.2-k2.3.20-2.0+neoforge.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    Older Minecraft versions
    1.20.2 to 1.20.4·NeoForge2.16.0-k2.4.21-2.02.16.0-k2.4.21-2.0 · KotlinLangForge-2.16.0-k2.4.21-2.0+neoforge.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.19.1 to 1.20·Forge1.2.0-k2.0.211.2.0-k2.0.21 · KotlinLangForge-1.2.0-k2.0.21-1.19.2+forge.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.18.1·Forge1.2.0-k2.0.211.2.0-k2.0.21 · KotlinLangForge-1.2.0-k2.0.21-1.18.2+forge.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.16.3 to 1.16.5·Forge2.7.1-k2.1.21-1.02.7.1-k2.1.21-1.0 · KotlinLangForge-2.7.1-k2.1.21-1.0+forge.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.

    214 releases

    MinecraftLoaderVersionReleasedSecurityGet it onDownload
    1.21.9 to 26.31.21.9 to 26.3The latest file for its Minecraft version and loader·NeoForge2.16.0-k2.4.21-3.12.16.0-k2.4.21-3.1 · KotlinLangForge-2.16.0-k2.4.21-3.1+neoforge.jar (main file)·20 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 7.9 MB
    1.20.5 to 1.21.81.20.5 to 1.21.8The latest file for its Minecraft version and loader·NeoForge2.16.0-k2.4.21-3.02.16.0-k2.4.21-3.0 · KotlinLangForge-2.16.0-k2.4.21-3.0+neoforge.jar (main file)·20 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 7.9 MB
    1.20.2 to 1.20.41.20.2 to 1.20.4The latest file for its Minecraft version and loader·NeoForge2.16.0-k2.4.21-2.02.16.0-k2.4.21-2.0 · KotlinLangForge-2.16.0-k2.4.21-2.0+neoforge.jar (main file)·20 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 9.0 MB
    1.17.1 to 1.20.41.17.1 to 1.20.4The latest file for its Minecraft version and loader·Forge2.16.0-k2.4.21-2.02.16.0-k2.4.21-2.0 · KotlinLangForge-kff-compat-2.16.0-k2.4.21-2.0+forge.jar (main file)·20 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 8.2 MB
    1.21.9 to 26.31.21.9 to 26.3·NeoForge2.15.0-k2.4.21-3.12.15.0-k2.4.21-3.1 · KotlinLangForge-2.15.0-k2.4.21-3.1+neoforge.jar (main file)·8 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 7.8 MB
    1.20.5 to 1.21.81.20.5 to 1.21.8·NeoForge2.15.0-k2.4.21-3.02.15.0-k2.4.21-3.0 · KotlinLangForge-2.15.0-k2.4.21-3.0+neoforge.jar (main file)·8 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 7.8 MB
    1.20.2 to 1.20.41.20.2 to 1.20.4·NeoForge2.15.0-k2.4.21-2.02.15.0-k2.4.21-2.0 · KotlinLangForge-2.15.0-k2.4.21-2.0+neoforge.jar (main file)·8 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 8.9 MB
    1.17.1 to 1.20.41.17.1 to 1.20.4·Forge2.15.0-k2.4.21-2.02.15.0-k2.4.21-2.0 · KotlinLangForge-kff-compat-2.15.0-k2.4.21-2.0+forge.jar (main file)·8 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 8.2 MB
    1.21.9 to 26.31.21.9 to 26.3·NeoForge2.15.0-k2.4.20-3.12.15.0-k2.4.20-3.1 · KotlinLangForge-2.15.0-k2.4.20-3.1+neoforge.jar (main file)·7 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 7.8 MB
    1.20.5 to 1.21.81.20.5 to 1.21.8·NeoForge2.15.0-k2.4.20-3.02.15.0-k2.4.20-3.0 · KotlinLangForge-2.15.0-k2.4.20-3.0+neoforge.jar (main file)·7 Oct 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 7.8 MB
    1.20.2 to 1.20.41.20.2 to 1.20.4·NeoForge2.15.0-k2.4.20-2.02.15.0-k2.4.20-2.0 · KotlinLangForge-2.15.0-k2.4.20-2.0+neoforge.jar (main file)·7 Oct 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 8.9 MB
    1.17.1 to 1.20.41.17.1 to 1.20.4·Forge2.15.0-k2.4.20-2.02.15.0-k2.4.20-2.0 · KotlinLangForge-kff-compat-2.15.0-k2.4.20-2.0+forge.jar (main file)·7 Oct 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 8.2 MB
    1.21.9 to 26.31.21.9 to 26.3·NeoForge2.14.1-k2.4.20-3.12.14.1-k2.4.20-3.1 · KotlinLangForge-2.14.1-k2.4.20-3.1+neoforge.jar (main file)·16 Sep 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 7.8 MB
    1.20.5 to 1.21.81.20.5 to 1.21.8·NeoForge2.14.1-k2.4.20-3.02.14.1-k2.4.20-3.0 · KotlinLangForge-2.14.1-k2.4.20-3.0+neoforge.jar (main file)·16 Sep 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 7.8 MB
    1.20.2 to 1.20.41.20.2 to 1.20.4·NeoForge2.14.1-k2.4.20-2.02.14.1-k2.4.20-2.0 · KotlinLangForge-2.14.1-k2.4.20-2.0+neoforge.jar (main file)·16 Sep 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 8.9 MB
    1.17.1 to 1.20.41.17.1 to 1.20.4·Forge2.14.1-k2.4.20-2.02.14.1-k2.4.20-2.0 · KotlinLangForge-kff-compat-2.14.1-k2.4.20-2.0+forge.jar (main file)·16 Sep 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 8.2 MB
    1.21.9 to 26.21.21.9 to 26.2·NeoForge2.14.0-k2.4.20-3.12.14.0-k2.4.20-3.1 · KotlinLangForge-2.14.0-k2.4.20-3.1+neoforge.jar (main file)·14 Sep 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 7.8 MB
    1.20.5 to 1.21.81.20.5 to 1.21.8·NeoForge2.14.0-k2.4.20-3.02.14.0-k2.4.20-3.0 · KotlinLangForge-2.14.0-k2.4.20-3.0+neoforge.jar (main file)·14 Sep 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 7.8 MB
    1.20.2 to 1.20.41.20.2 to 1.20.4·NeoForge2.14.0-k2.4.20-2.02.14.0-k2.4.20-2.0 · KotlinLangForge-2.14.0-k2.4.20-2.0+neoforge.jar (main file)·14 Sep 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 8.9 MB
    1.17.1 to 1.20.41.17.1 to 1.20.4·Forge2.14.0-k2.4.20-2.02.14.0-k2.4.20-2.0 · KotlinLangForge-kff-compat-2.14.0-k2.4.20-2.0+forge.jar (main file)·14 Sep 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 8.2 MB
    1 to 20 of 21412345…11

    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

    • 2.15.0-k2.4.21-2.0+forge8 Oct 2026v2.15.0-k2.4.21-2.0+forge - fix automatic event subscriber crashes on zero-argument…
    • 2.10.3-k2.2.0-2.0+forge31 Jul 2025…be processed on Forge and will result in a crash!