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    2,055,424 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 2026.269,392 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.

    KubeJS Iron's Spells

    Mod

    Create custom spells and spellbooks with scripts for your world.

    B89/ 100
    • OverviewB
    • SecurityPassed
    • PrivacyNone found
    • AINone found
    • CompatibilityUp to 1.21.1
    • ModpacksIn 645
    • ReleasesLatest 17 Oct

    Download

    irons_spells_js-4.0.3.jar

    Released 18 Nov 2025 · 146.6 KB

    Passed: our checks found nothing harmful in this file.

    Download
    OverviewSecurityPrivacyAICompatibilityModpacksReleases

    Why grade B

    How grades work

    Strengths

    • Security checks passed
    • Regular releases for Minecraft 1.21.1, 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−6 points
    • Some modpacks removed it−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.7 days ago (17 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.1.21.1 on NeoForge, 1.20.1 on Forge. 65% of the 995 popular NeoForge 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 8 of the last 24 months 6 / 6

    • Stability

      8 points lost14 / 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.53 of the 381 modpacks with two or more versions removed it in a later one (14%) See the 53 modpacks8 / 10
      Quick fixesHow often a release needed a quick fix: a new release within 3 days to fix a problem in it.4 of its 11 releases in 2 years needed a quick fix (36%) See the 4 releases1 / 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 · squoshi/irons_spells_js 7 / 7
      Place to report problemsWhether the project page links to a place where players can report problems: an issue tracker.GitHub issues · sentwayfarer/irons_spells_js 3 / 3

    • Popularity

      Full points4 / 4
      DownloadsDownloads on Modrinth and CurseForge. Full points from 5 million.3,031,613 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, 25 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
    Total89 / 100

    63.4 of the 71 points that apply = 89 out of 100. The points above are rounded to whole numbers.

    About

    KubeJS Iron's Spells is a scripting addon for customizing Iron's Spells 'n Spellbooks, rather than a mod that adds content by itself. It lets script creators define spells with configurable cast times, cooldowns, mana costs, schools, rarity, levels, sounds, and casting callbacks, as well as create spell schools and their power and resistance attributes. Creators can also register custom spellbooks, staves, and magic swords, setting details such as spell slots, attributes, attack stats, and spells that come with an item. The addon exposes spell-related events, including mana-change and spell-cast hooks, and supports changing the spell-selection wheel through scripts. With EntityJS, scripts can add spell-casting mobs and modify existing mobs to use spells and spell-casting AI; the addon also supports custom Alchemist Cauldron recipes.

    Written from Modrinth . How we write it

    In-game changes

    Changes the game's code in 2 areas, as a library other mods build on: Mobs and their behaviorChanges 2 game code files in this area: mobs, animals, villagers, projectiles and how they move and act. and PlayerChanges 1 game code file in this area: your character: movement, abilities, hunger and controls..

    Adds no new blocks, items or other content.

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

    Often used with it

    See all 30
    Iron's Spells 'n SpellbooksAL_Ender's CataclysmBAttributeFixASophisticated StorageAMmmMmmMmmMmmA

    Details

    Creators
    Wayfarer and Liopyu
    License
    MIT License
    Downloads
    3M
    Created
    29 Feb 2024
    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

    Creates settings files
    The mod keeps its settings in the config folder of your game, where you can change or delete them. Only in its files for NeoForge 1.20.1 to 1.21.1.

    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 5 latest files checked, last on 17 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.
      5 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.
      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 · 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
    • 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
      17 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
    • 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
      49 code files read

    Compatibility

    See all 25 files
    NeoForge
    Forge
    1.191.2126.1

    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.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.
    Iron's Spells 'n Spellbooksin some filesAKubeJSin some filesA
    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 1.21.1. Many recently updated mods still support 1.21.1.

    Modpacks using this project

    Find modpacks with it
    Modpacks that released a new version with this project, each month
    100500
    Oct 2024: 23 modpacksNov 2024: 22 modpacksDec 2024: 19 modpacksJan 2025: 24 modpacksFeb 2025: 33 modpacksMar 2025: 28 modpacksApr 2025: 39 modpacksMay 2025: 35 modpacksJun 2025: 36 modpacksJul 2025: 40 modpacksAug 2025: 51 modpacksSep 2025: 45 modpacksOct 2025: 48 modpacksNov 2025: 46 modpacksDec 2025: 53 modpacksJan 2026: 33 modpacksFeb 2026: 29 modpacksMar 2026: 46 modpacksApr 2026: 58 modpacksMay 2026: 67 modpacksJun 2026: 76 modpacksJul 2026: 79 modpacksAug 2026: 81 modpacksSep 2026: 77 modpacks
    Oct 2024Oct 2025Sep 2026
    Modpacks that released a new version with this project, each month
    Oct 202423
    Nov 202422
    Dec 202419
    Jan 202524
    Feb 202533
    Mar 202528
    Apr 202539
    May 202535
    Jun 202536
    Jul 202540
    Aug 202551
    Sep 202545
    Oct 202548
    Nov 202546
    Dec 202553
    Jan 202633
    Feb 202629
    Mar 202646
    Apr 202658
    May 202667
    Jun 202676
    Jul 202679
    Aug 202681
    Sep 202677

    More modpacks put it in their new versions than a year ago: 73 a month now, 41 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..

    645 modpacks include KubeJS Iron's Spells in at least one of their versions. Here are the 30 most downloaded.

    ModpackDownloadsLast version with it
    Craftoria2.9M downloadslast version with it 13 Sep 2026Soulrend - Dark Fantasy RPG Soulslike1.1M downloadslast version with it 21 Oct 2026SUPERIOR - RPG513K downloadslast version with it 29 Dec 2025Prodigium Reforged462K downloadslast version with it 22 Oct 2026waccyy's Fantasia329K downloadslast version with it 8 Aug 2026BTH - Beyond The Horizon218K downloadslast version with it 15 Nov 2025Reimagined151K downloadslast version with it 6 Aug 2025Modded Together138K downloadslast version with it 21 May 2026Vampires Strike Back129K downloadslast version with it 9 Sep 2026Arcadia Echoes Of Power V2117K downloadslast version with it 13 Oct 2026
    1 to 10 of 30123

    Often in the same modpacks

    Mods that modpacks often add together with KubeJS Iron's Spells. Share: how many of the modpacks with KubeJS Iron's Spells also have that mod.

    ProjectTypeShareGrade
    Iron's Spells 'n SpellbooksAModin 100% of the modpacks with KubeJS Iron's SpellsL_Ender's CataclysmBModin 72% of the modpacks with KubeJS Iron's SpellsAttributeFixAModin 66% of the modpacks with KubeJS Iron's SpellsSophisticated StorageAModin 63% of the modpacks with KubeJS Iron's SpellsMmmMmmMmmMmmAModin 61% of the modpacks with KubeJS Iron's SpellsApotheosisAModin 60% of the modpacks with KubeJS Iron's SpellssparkAModin 59% of the modpacks with KubeJS Iron's SpellsAmendmentsAModin 59% of the modpacks with KubeJS Iron's SpellsArs NouveauAModin 57% of the modpacks with KubeJS Iron's SpellsFTB Chunks (NeoForge)AModin 56% of the modpacks with KubeJS Iron's Spells
    1 to 10 of 30123

    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
    1.21.1·NeoForge4.0.34.0.3 · irons_spells_js-4.0.3.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.20.1·NeoForge3.1.1-release3.1.1-release · irons_spells_js-1.20.1-3.1.1-release.jarSends: None foundRequires:Iron's Spells 'n Spellbooks, KubeJSIron's Spells 'n Spellbooks, KubeJSPassedOur checks found nothing harmful in this file. Its code was read too.
    1.20.1·Forge6.5-3.16-r36.5-3.16-r3 · irons_spells_js-1.20.1-6.5-3.16-r3-release.jarSends: None foundRequires:Iron's Spells 'n SpellbooksIron's Spells 'n SpellbooksPassedOur checks found nothing harmful in this file. Its code was read too.
    Older Minecraft versions
    1.19.2·NeoForge, Forge3.0.0-release3.0.0-release · irons_spells_js-1.19.2-3.0.0-release.jarSends: None foundRequires:KubeJS, Iron's Spells 'n SpellbooksKubeJS, Iron's Spells 'n SpellbooksPassedOur checks found nothing harmful in this file. Its code was read too.
    1.19.2·Forge3.0.13.0.1 · irons_spells_js-1.19.2-3.0.1-release.jarSends: None foundRequires:KubeJS, Iron's Spells 'n SpellbooksKubeJS, Iron's Spells 'n SpellbooksPassedOur checks found nothing harmful in this file. Its code was read too.

    25 releases

    MinecraftLoaderVersionReleasedSecurityGet it onDownload
    1.20.1The latest file for its Minecraft version and loader·Forge6.5-3.16-r36.5-3.16-r3 · irons_spells_js-1.20.1-6.5-3.16-r3-release.jar (main file)·17 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 337.4 KB
    1.20.1·Forge6.5-3.16-r26.5-3.16-r2 · irons_spells_js-1.20.1-6.5-3.16-r2-release.jar (main file)·16 Oct 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 337.4 KB
    1.20.1·Forge6.5-3.16-r16.5-3.16-r1 · irons_spells_js-1.20.1-6.5-3.16-r1-release.jar (main file)·16 Oct 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 337.3 KB
    1.20.1·Forge6.5-3.14-r26.5-3.14-r2 · irons_spells_js-1.20.1-6.5-3.14-r2-release.jar (main file)·15 Mar 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 335.8 KB
    1.20.1·Forge6.5-3.14-r16.5-3.14-r1 · irons_spells_js-1.20.1-6.5-3.14-r1-release.jar (main file)·13 Mar 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 335.8 KB
    1.21.1The latest file for its Minecraft version and loader·NeoForge4.0.34.0.3 · irons_spells_js-4.0.3.jar (main file)·18 Nov 2025PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 146.6 KB
    1.21.1·NeoForge4.0.24.0.2 · irons_spells_js-4.0.2.jar·22 May 2025PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 146.4 KB
    1.21.1·NeoForge4.0.14.0.1 · irons_spells_js-4.0.1.jar (main file)·2 Apr 2025PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 139.9 KB
    1.21.1·NeoForge4.0.04.0.0 · irons_spells_js-4.0.0.jar (main file)·30 Mar 2025PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 139.9 KB
    1.19.2The latest file for its Minecraft version and loader·Forge3.0.13.0.1 · irons_spells_js-1.19.2-3.0.1-release.jar·19 Jan 2025PassedOur checks found nothing harmful in this file. Its code was read too.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 115.0 KB
    1.20.1The latest file for its Minecraft version and loader·Forge, NeoForge3.1.1-release3.1.1-release · irons_spells_js-1.20.1-3.1.1-release.jar (first file)·19 Sep 2024PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 142.1 KB
    1.20.1·Forge, NeoForge3.1.0-release3.1.0-release · irons_spells_js-1.20.1-3.1.0-release.jar (first file)·29 Jul 2024PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 119.7 KB
    1.19.2The latest file for its Minecraft version and loader·Forge, NeoForge3.0.0-release3.0.0-release · irons_spells_js-1.19.2-3.0.0-release.jar (first file)·29 Jul 2024PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 114.9 KB
    1.20.1·NeoForge, Forge2.1.22.1.2 · irons_spells_js-1.20.1-2.1.2-release.jar·5 Jul 2024PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 110.4 KB
    1.20.1·NeoForge, Forge2.1.12.1.1 · irons_spells_js-1.20.1-2.1.1-release.jar·9 Apr 2024PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 95.1 KB
    1.19.2·Forge2.0.12.0.1 · irons_spells_js-1.19.2-2.0.1-release.jar·9 Apr 2024PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 81.7 KB
    1.20.1·NeoForge, Forge2.1.02.1.0 · irons_spells_js-1.20.1-2.1.0-release.jar·8 Apr 2024PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 94.9 KB
    1.19.2·Forge2.0.02.0.0 · irons_spells_js-1.19.2-2.0.0-release.jar·8 Apr 2024PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 81.4 KB
    1.20.1·NeoForge, Forge1.1.21.1.2 · irons_spells_js-1.20.1-1.1.2-release.jar·15 Mar 2024PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 49.4 KB
    1.19.2·Forge1.0.21.0.2 · irons_spells_js-1.19.2-1.0.2-release.jar·15 Mar 2024PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 49.3 KB
    1 to 20 of 2512

    Quick fixes

    In the last 2 years, 4 releases needed a quick fix: a new release within 3 days to fix a problem. This lowers the grade by 6 points.

    See them, newest first

    Quick fixesReleases followed within 3 days by a new release that fixes a problem in them.4

    • KubeJS Iron's Spells 6.5-3.16-r317 Oct 2026Small mana calculation fix
    • KubeJS Iron's Spells 6.5-3.16-r216 Oct 2026HOTFIX - Fixed mixin target error due to Iron's Spells API…
    • KubeJS Iron's Spells 6.5-3.14-r215 Mar 2026Hypothetically fixed mana regeneration not working
    • KubeJS Iron's Spells 4.0.12 Apr 2025Fix startup crash