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    2,054,198 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 2026.269,438 projects gradedProjects with a letter from A to F. Counted on 25 Oct 2026.
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    © 2026 ModgradeNot an official Minecraft product. Not approved by or associated with Mojang or Microsoft.

    CastLib

    Mod

    A library that assists with long-range spell casting.

    D63/ 100
    • OverviewD
    • SecurityPassed
    • PrivacyNone found
    • AINone found
    • CompatibilityMinecraft 1.20.1
    • ModpacksIn 51
    • ReleasesLatest Dec 2025

    Download

    CastLib-1.20.1-2.0.0.jar

    Released 22 Dec 2025 · 47.1 KB

    Passed: our checks found nothing harmful in this file.

    Download

    Required to run

    • Ars NouveauAMinecraft 1.20.1 · Forge (release 4.12.7)
    OverviewSecurityPrivacyAICompatibilityModpacksReleases

    Why grade D

    How grades work

    Strengths

    • Security checks passed

    Points lost

    • No release in 9 months−13 points
    • Releases in only 4 of the last 24 months−3 points
    • Some modpacks removed it−3 points
    • Releases replaced within 3 days to fix a problem−3 points
    • No public issue tracker−3 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.9 months ago (31 Jan 2026) 4 / 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. 77% of the 516 popular Forge 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 4 of the last 24 months 3 / 6

    • Stability

      6 points lost16 / 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.8 of the 42 modpacks with two or more versions removed it in a later one (19%) See the 8 modpacks7 / 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 12 releases in 2 years needed a quick fix (25%) See the 3 releases4 / 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.1 known conflict, but it does not count in the grade See the known conflict5 / 5

    • Transparency

      3 points lost7 / 10
      Source codeWhether the project page links to its source code, so anyone can read what it does.GitHub · mumu17-git/CastLib 7 / 7
      Place to report problemsWhether the project page links to a place where players can report problems: an issue tracker.No link to report problems 0 / 3

    • Popularity

      1 point lost3 / 4
      DownloadsDownloads on Modrinth and CurseForge. Full points from 5 million.139,485 3 / 4

    • Track record

      5 points lost3 / 8
      AgeHow long the project has existed. It counts less when no new file came out recently.15 months, 13 releases 3 / 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
    Total63 / 100

    44.8 of the 71 points that apply = 63 out of 100. The points above are rounded to whole numbers.

    This author published several projects at once on Modrinth: up to 8 projects published within 2 weeks. 5 of the author's 11 projects have only one release and no source code link. A series of small add-ons is often published this way. It does not change the grade.

    About

    CastLib is a shared library that lets compatible mods support long-distance casting of Ars Nouveau spells; it provides no standalone gameplay content and must be used by another mod, such as ArsArms.

    Written from Modrinth . How we write it

    In-game changes

    Does not change the game's code directly.

    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
    Ars NouveauA[TaCZ] Timeless and Classics ZeroAYUNG's Better Ocean MonumentsAYUNG's Better Nether FortressesARelicsA

    Details

    Creator
    mumu17
    License
    MIT License
    Downloads
    139K
    Created
    20 Jul 2025
    Official pages
    Modrinth , CurseForge
    Links
    Source code

    Security

    No harmful code found

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

    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 · The latest file 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.
      1 latest file, 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.
      The internet, 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 so far that AI was used to make it

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

    We have not read its code history yet.

    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.
    • Code historyThe public code on GitHub: who made each change, credit lines such as "Co-authored-by", and its files.
      Not read yet
    • 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
      23 of 27 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
      9 code files read

    Compatibility

    See all 13 files
    Forge
    1.201.2126.126.3

    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.
    Ars NouveauA
    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.

    Known conflicts

    These projects do not work together with CastLib: their authors or CastLib'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 CastLib, so you only need one.

    ProjectTypeDownloadsDeclared by
    [TaCZ] ArsArms - Ars Nouveau & Timeless and Classics ZeroMod116K downloadsdeclared by [TaCZ] ArsArms - Ars Nouveau & Timeless and Classics Zero

    Related projects

    Projects that need CastLib to work.

    ProjectTypeDownloadsGrade
    [TaCZ] ArsArms - Ars Nouveau & Timeless and Classics ZeroCMod116K downloadsSlashNouveau - Ars Nouveau & SlashBladeDMod28K downloads

    Modpacks using this project

    Find modpacks with it
    Modpacks that released a new version with this project, each month
    1050
    Oct 2024: 0 modpacksNov 2024: 0 modpacksDec 2024: 0 modpacksJan 2025: 0 modpacksFeb 2025: 0 modpacksMar 2025: 0 modpacksApr 2025: 0 modpacksMay 2025: 0 modpacksJun 2025: 0 modpacksJul 2025: 1 modpackAug 2025: 5 modpacksSep 2025: 2 modpacksOct 2025: 8 modpacksNov 2025: 8 modpacksDec 2025: 7 modpacksJan 2026: 6 modpacksFeb 2026: 5 modpacksMar 2026: 5 modpacksApr 2026: 10 modpacksMay 2026: 5 modpacksJun 2026: 3 modpacksJul 2026: 3 modpacksAug 2026: 3 modpacksSep 2026: 1 modpack
    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 20250
    Apr 20250
    May 20250
    Jun 20250
    Jul 20251
    Aug 20255
    Sep 20252
    Oct 20258
    Nov 20258
    Dec 20257
    Jan 20266
    Feb 20265
    Mar 20265
    Apr 202610
    May 20265
    Jun 20263
    Jul 20263
    Aug 20263
    Sep 20261

    More modpacks put it in their new versions than a year ago: 4 a month now, 1 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..

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

    ModpackDownloadsLast version with it
    The Pioneers218K downloadslast version with it 28 Jan 2026TACZ LIBRARY88K downloadslast version with it 17 Jan 2026Mystic's Monstrosity84K downloadslast version with it 15 Nov 2025Magitech Fantasia38K downloadslast version with it 28 Oct 2025Ars Eclectica: an Ars Nouveau Experience 29K downloadslast version with it 17 Nov 2025Enchanted Genesis 20K downloadslast version with it 15 Sep 2025Lionheart Laboratories11K downloadslast version with it 7 Jun 2026Sloppa Inc2.9K downloadslast version with it 30 Jul 2026The Darkstorm Modpack2.2K downloadslast version with it 2 Jan 2026Bread's Modern Sandbox (Cosmotic)1.7K downloadslast version with it 13 Mar 2026
    1 to 10 of 30123

    Often in the same modpacks

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

    ProjectTypeShareGrade
    Ars NouveauAModin 98% of the modpacks with CastLib[TaCZ] Timeless and Classics ZeroAModin 76% of the modpacks with CastLibYUNG's Better Ocean MonumentsAModin 61% of the modpacks with CastLibYUNG's Better Nether FortressesAModin 61% of the modpacks with CastLibRelicsAModin 59% of the modpacks with CastLibL_Ender's CataclysmBModin 59% of the modpacks with CastLibMekanism GeneratorsBModin 57% of the modpacks with CastLibArs ElementalAModin 55% of the modpacks with CastLibYUNG's Better Jungle TemplesAModin 55% of the modpacks with CastLibYUNG's Better Witch HutsAModin 55% of the modpacks with CastLib
    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·Forge2.0.02.0.0 · CastLib-1.20.1-2.0.0.jarSends: None foundRequires:Ars NouveauPassedOur checks found nothing harmful in this file. Its code was read too.

    13 releases

    MinecraftLoaderVersionReleasedSecurityGet it onDownload
    1.20.1The latest file for its Minecraft version and loader·Forge2.0.02.0.0 · CastLib-1.20.1-2.0.0.jar (main file)·22 Dec 2025PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 47.1 KB
    1.20.1·Forge1.0.121.0.12 · CastLib-1.20.1-1.0.12.jar·13 Aug 2025PassedOur checks found nothing harmful in this file. Its code was read too.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 47.2 KB
    1.20.1·Forge1.0.111.0.11 · CastLib-1.20.1-1.0.11.jar·13 Aug 2025PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 47.4 KB
    1.20.1·Forge1.0.101.0.10 · CastLib-1.20.1-1.0.10.jar·3 Aug 2025PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 47.1 KB
    1.20.1·Forge1.0.91.0.9 · CastLib-1.20.1-1.0.9.jar·28 Jul 2025PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 46.4 KB
    1.20.1·Forge1.0.81.0.8 · CastLib-1.20.1-1.0.8.jar·27 Jul 2025PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 46.3 KB
    1.20.1·Forge1.0.71.0.7 · CastLib-1.20.1-1.0.7.jar·26 Jul 2025PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 45.5 KB
    1.20.1·Forge1.0.61.0.6 · CastLib-1.20.1-1.0.6.jar·25 Jul 2025PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 45.9 KB
    1.20.1·Forge1.0.51.0.5 · CastLib-1.20.1-1.0.5.jar·23 Jul 2025PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 45.8 KB
    1.20.1·Forge1.0.41.0.4 · CastLib-1.20.1-1.0.4.jar·22 Jul 2025PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 45.8 KB
    1.20.1·Forge1.0.31.0.3 · CastLib-1.20.1-1.0.3.jar·21 Jul 2025PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 45.5 KB
    1.20.1·Forge1.0.21.0.2 · CastLib-1.20.1-1.0.2.jar·21 Jul 2025PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 45.5 KB
    1.20.1·Forge1.0.01.0.0 · CastLib-1.20.1-1.0.0.jar·20 Jul 2025PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 10.8 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 3 points.

    See them, newest first

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

    • CastLib-1.20.1-1.0.8.jar27 Jul 2025Fix a method provider.
    • CastLib-1.20.1-1.0.7.jar26 Jul 2025Fix a expendMana mixin method.
    • CastLib-1.20.1-1.0.4.jar22 Jul 2025Fixed an issue where a mana cost warning appeared incorrectly…