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    2,046,932 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 2026.269,480 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.

    FermiumBooter

    Mod

    A tool for mod developers to change classes normally out of reach.

    A97/ 100
    • OverviewA
    • SecurityPassed
    • PrivacyNone found
    • AINone found
    • CompatibilityUp to 1.20.1
    • ModpacksIn 484
    • ReleasesLatest 24 Oct

    Download

    FermiumBooter-1.0.0-1.20.1.jar

    Released 22 Jun 2026 · 638.0 KB

    Passed: our checks found nothing harmful in this file.

    Download
    OverviewSecurityPrivacyAICompatibilityModpacksReleases

    Why grade A

    How grades work

    Strengths

    • Security checks passed
    • Regular releases for Minecraft 1.20.1, a version many recently updated mods still support
    • Public source code and issue tracker
    • Widely used
    • Around for years

    Points lost

    • Releases replaced within 3 days to fix a problem−2 points
    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.Today (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.1.20.1 on Forge. 15% or more of the popular mods updated in the last 6 months also have files for 1.20.1. 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 9 of the last 24 months 6 / 6

    • Stability

      2 points lost20 / 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.25 of the 355 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.3 of its 17 releases in 2 years needed a quick fix (18%) See the 3 releases5 / 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 · fonnymunkey/FermiumBooter 7 / 7
      Place to report problemsWhether the project page links to a place where players can report problems: an issue tracker.GitHub issues · fonnymunkey/FermiumBooter 3 / 3

    • Popularity

      Full points4 / 4
      DownloadsDownloads on Modrinth and CurseForge. Full points from 5 million.3,676,023 4 / 4

    • Track record

      Full points8 / 8
      AgeHow long the project has existed. It counts less when no new file came out recently.2.7 years, 20 releases 8 / 8

    • Security

      Passed
      File checksThis check adds no points. It can only take points away.Our checks found nothing harmful in the latest file for recent Minecraft versions. See Security
    Total97 / 100

    69.1 of the 71 points that apply = 97 out of 100. The points above are rounded to whole numbers.

    About

    FermiumBooter is a developer utility for applying mixins to classes during both early and late loading, including Vanilla, Forge, and mod classes that might otherwise be unavailable for modification. Its annotation-based system lets developers toggle mixins using configuration settings or the presence of other mods, with optional compatibility checks that can log warnings, show in-game notices, or disable incompatible mixins. Developers can also control whether enqueued mixins are applied and check for loaded mods during early mixin processing. The project includes a configuration wrapper that supports straightforward registration, writable values, and configs that respond to loading, reloading, and game setup events.

    Written from Modrinth and CurseForge . 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
    BetterFpsCChiselCFoamFixCYUNG's Better CavesAFastFurnaceB

    Details

    Creators
    fonnymunkey and Nischhelm
    License
    GNU Lesser General Public License v3.0 or later
    Downloads
    3.7M
    Created
    29 Jan 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

    Creates settings files
    The mod keeps its settings in the config folder of your game, where you can change or delete them.
    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 mixinextras-forge, a library 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 · 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. The answer above is about the one for a recent version. 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 · Its one file 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 its one file, 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
      33 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
      13 code files read

    Compatibility

    See all 20 files
    Forge
    1.121.151.171.2026.1

    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.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.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 1.20.1. Many recently updated mods still support 1.20.1.

    Related projects

    Projects that need FermiumBooter to work.

    ProjectTypeDownloadsGrade
    So Many Enchantments [Fabric]BMod24.1M downloadsShieldBreakCMod13.8M downloadsRLMixinsBMod10.8M downloadsSpartan and Fire: RLCraft EditionDMod10.5M downloadsRLCombatAMod10.3M downloadsFermiumASMCMod2.6M downloadsRLFoliageAMod2M downloadsNoiseThreaderBMod1.7M downloadsEditableEdiblesDMod1.5M downloadsSRPMixinsAMod1.2M downloads
    1 to 10 of 391234

    Modpacks using this project

    Find modpacks with it
    Modpacks that released a new version with this project, each month
    60300
    Oct 2024: 26 modpacksNov 2024: 16 modpacksDec 2024: 24 modpacksJan 2025: 44 modpacksFeb 2025: 42 modpacksMar 2025: 44 modpacksApr 2025: 40 modpacksMay 2025: 38 modpacksJun 2025: 34 modpacksJul 2025: 52 modpacksAug 2025: 55 modpacksSep 2025: 35 modpacksOct 2025: 47 modpacksNov 2025: 49 modpacksDec 2025: 42 modpacksJan 2026: 53 modpacksFeb 2026: 43 modpacksMar 2026: 47 modpacksApr 2026: 36 modpacksMay 2026: 40 modpacksJun 2026: 49 modpacksJul 2026: 46 modpacksAug 2026: 37 modpacksSep 2026: 33 modpacks
    Oct 2024Oct 2025Sep 2026
    Modpacks that released a new version with this project, each month
    Oct 202426
    Nov 202416
    Dec 202424
    Jan 202544
    Feb 202542
    Mar 202544
    Apr 202540
    May 202538
    Jun 202534
    Jul 202552
    Aug 202555
    Sep 202535
    Oct 202547
    Nov 202549
    Dec 202542
    Jan 202653
    Feb 202643
    Mar 202647
    Apr 202636
    May 202640
    Jun 202649
    Jul 202646
    Aug 202637
    Sep 202633

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

    ModpackDownloadsLast version with it
    RLCraft Dregora2.1M downloadslast version with it 2 Dec 2025Last Days of Humanity1.4M downloadslast version with it 29 May 2024Rebirth of the Night (RotN)1.3M downloadslast version with it 2 Feb 2026MineColonies: Dimensional Adventure1.2M downloadslast version with it 20 Sep 2024Divine Journey 2965K downloadslast version with it 6 Jun 2026Optimized fps732K downloadslast version with it 7 Aug 2025MeatballCraft, Dimensional Ascension613K downloadslast version with it 16 Aug 2026Dysfunctional's Tech, Bombs, Guns, and War568K downloadslast version with it 6 Jul 2025Jurassic World Reborn II438K downloadslast version with it 9 Aug 2025Optimized fps [(NEO)FORGE]433K downloadslast version with it 6 Aug 2025
    1 to 10 of 30123

    Often in the same modpacks

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

    ProjectTypeShareGrade
    BetterFpsCModin 51% of the modpacks with FermiumBooterChiselCModin 51% of the modpacks with FermiumBooterFoamFixCModin 51% of the modpacks with FermiumBooterYUNG's Better CavesAModin 47% of the modpacks with FermiumBooterFastFurnaceBModin 47% of the modpacks with FermiumBooterParticle CullingCModin 46% of the modpacks with FermiumBooterCoFH WorldDModin 45% of the modpacks with FermiumBooterSpartan WeaponryCModin 43% of the modpacks with FermiumBooterInventory Tweaks [1.12 only]-Modin 43% of the modpacks with FermiumBooterDynamic SurroundingsAModin 42% of the modpacks with FermiumBooter
    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
    1.20.1·Forge1.0.01.0.0 · FermiumBooter-1.0.0-1.20.1.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    Older Minecraft versions
    1.12.2·Forge1.6.31.6.3 · `FermiumBooter-1.6.3.jarSends: Not read yetRequires:NothingPassedOur checks found nothing harmful in this file.

    20 releases

    MinecraftLoaderVersionReleasedSecurityGet it onDownload
    1.12.2The latest file for its Minecraft version and loader·Forge1.6.31.6.3 · `FermiumBooter-1.6.3.jar (main file, 3 other files in this version not shown)·24 Oct 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.5 MB
    1.12.2·Forge1.6.21.6.2 · `FermiumBooter-1.6.2.jar (main file, 3 other files in this version not shown)·22 Oct 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·Forge1.6.11.6.1 · `FermiumBooter-1.6.1.jar (main file, 3 other files in this version not shown)·21 Oct 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·Forge1.6.01.6.0 · `FermiumBooter-1.6.0.jar (main file, 3 other files in this version not shown)·20 Oct 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.5 MB
    1.12.2·Forge1.5.31.5.3 · `FermiumBooter-1.5.3.jar (main file, 3 other files in this version not shown)·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 · 2.4 MB
    1.12.2·Forge1.5.21.5.2 · `FermiumBooter-1.5.2.jar·23 Sep 2026PassedOur checks found nothing harmful in this file. Its code was read too.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 2.4 MB
    1.12.2·Forge1.5.11.5.1 · `FermiumBooter-1.5.1.jar·19 Aug 2026PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 2.4 MB
    1.12.2·Forge1.5.01.5.0 · `FermiumBooter-1.5.0.jar·12 Aug 2026PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 2.4 MB
    1.20.1The latest file for its Minecraft version and loader·Forge1.0.01.0.0 · FermiumBooter-1.0.0-1.20.1.jar·22 Jun 2026PassedOur checks found nothing harmful in this file. Its code was read too.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 638.0 KB
    1.12.2·Forge1.4.11.4.1 · `FermiumBooter-1.4.1.jar (main file, 3 other files in this version not shown)·21 Nov 2025PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 1.8 MB
    1.12.2·Forge1.4.11.4.1 · `FermiumBooter-1.4.1.jar·11 Nov 2025PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 1.8 MB
    1.12.2·Forge1.4.01.4.0 · `FermiumBooter-1.4.0.jar (main file, 3 other files in this version not shown)·28 Oct 2025PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 1.8 MB
    1.12.2·Forge1.3.21.3.2 · `FermiumBooter-1.3.2.jar (main file, 3 other files in this version not shown)·4 Aug 2025PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 1.8 MB
    1.12.2·Forge1.3.11.3.1 · `FermiumBooter-1.3.1.jar (main file, 3 other files in this version not shown)·16 Jul 2025PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 1.2 MB
    1.12.2·Forge1.3.01.3.0 · `FermiumBooter-1.3.0.jar (main file, 3 other files in this version not shown)·7 Jul 2025PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 1.2 MB
    1.12.2·Forge1.2.01.2.0 · `FermiumBooter-1.2.0.jar (main file, 3 other files in this version not shown)·5 Apr 2025PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 1.2 MB
    1.12.2·Forge1.1.11.1.1 · `FermiumBooter-1.1.1.jar (first file, 3 other files in this version not shown)·28 Aug 2024PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 1.2 MB
    1.12.2·Forge1.1.01.1.0 · `FermiumBooter-1.1.0.jar (first file, 3 other files in this version not shown)·15 May 2024PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 1.1 MB
    1.12.2·Forge1.0.11.0.1 · FermiumBooter-1.0.1.jar (first file, 2 other files in this version not shown)Beta·16 Mar 2024PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Beta · 13.5 KB
    1.12.2·Forge1.0.01.0.0 · FermiumBooter-1.0.0.jar (first file)Beta·29 Jan 2024PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Beta · 13.0 KB

    Quick fixes

    In the last 2 years, 3 releases needed a quick fix: a new release within 3 days to fix a problem. This lowers the grade by 2 points.

    See them, newest first

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

    • `FermiumBooter-1.6.3.jar24 Oct 2026v1.6.3 fix #11 duplicate mods issue in some setups
    • `FermiumBooter-1.6.2.jar22 Oct 2026v1.6.2 another hotfix for another serverside issue (mods using ModSide:CLIENT…
    • `FermiumBooter-1.6.1.jar21 Oct 2026v1.6.1 - hotfix for putting ignored mod jars on the classpath, leading to…