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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.

    BlockUI

    Mod

    A library other mods need to show their menus and screens.

    A100/ 100
    • OverviewA
    • SecurityPassed
    • PrivacyNone found
    • AINone found
    • CompatibilityUp to 1.21.1
    • ModpacksIn 12,035
    • ReleasesLatest 11 Oct

    Download

    blockui-1.0.209-1.21.1.jar

    Released 28 Jan 2026 · 457.0 KB

    Passed: our checks found nothing harmful in this file.

    A newer beta from 11 Oct 2026 is in Releases.

    Download
    OverviewSecurityPrivacyAICompatibilityModpacksReleases

    Why grade A

    How grades work

    Strengths

    • Security checks passed
    • Regular releases for Minecraft 1.21.1, a version many recently updated mods still support
    • Stable releases
    • Public source code
    • 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.13 days ago (11 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. 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 13 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.37 of the 375 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.1 of its 22 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 points7 / 7
      Source codeWhether the project page links to its source code, so anyone can read what it does.GitHub · ldtteam/BlockUI 7 / 7
      Place to report problemsWhether the project page links to a place where players can report problems: an issue tracker.Does not apply. CurseForge links are not in our data.

    • Popularity

      Full points4 / 4
      DownloadsDownloads on Modrinth and CurseForge. Full points from 5 million.55,490,493 4 / 4

    • Track record

      Full points8 / 8
      AgeHow long the project has existed. It counts less when no new file came out recently.5.1 years, 133 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
    Total100 / 100

    68 of the 68 points that apply = 100 out of 100.

    About

    BlockUI is an XML-based interface library for Minecraft mod developers, letting them define UI structure in XML and use a backing Window class to handle callbacks and supply data. Its interface tools include images, buttons with handlers, text input, scrolling, and drag screens, and it has been used in projects such as Structurize, MineColonies, StorageRacks, and MultiPiston.

    Written from CurseForge and the GitHub README . 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 28
    Multi-PistonCTownTalkCMacaw's TrapdoorsAAttributeFixAFTB Chunks (NeoForge)A

    Details

    Creators
    Raycoms, OrionOnline, someaddon and Nightenom
    License
    Not known
    Downloads
    55.6M
    Created
    13 Sep 2021
    Official page
    CurseForge
    Links
    Source code

    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. 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 13 latest files checked, last on 15 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.
      13 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
    • 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

    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 · 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.
      Not on Modrinth.
    • 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
      6 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
      166 code files read

    Compatibility

    See all 133 files
    NeoForge
    Forge
    1.171.201.2126.1

    Point at or tap a version to see its loaders.

    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 1.21.1. Many recently updated mods still support 1.21.1.

    Related projects

    Projects that need BlockUI to work.

    ProjectTypeDownloadsGrade
    MinecoloniesAMod89.7M downloadsStructurizeAMod77.5M downloadsVolcanic Mason: A MineColonies AddonBMod47K downloadsColony HorizonsCMod42 downloads

    Modpacks using this project

    Find modpacks with it
    Modpacks that released a new version with this project, each month
    8004000
    Oct 2024: 509 modpacksNov 2024: 516 modpacksDec 2024: 511 modpacksJan 2025: 651 modpacksFeb 2025: 549 modpacksMar 2025: 561 modpacksApr 2025: 566 modpacksMay 2025: 559 modpacksJun 2025: 533 modpacksJul 2025: 610 modpacksAug 2025: 578 modpacksSep 2025: 550 modpacksOct 2025: 593 modpacksNov 2025: 580 modpacksDec 2025: 616 modpacksJan 2026: 583 modpacksFeb 2026: 532 modpacksMar 2026: 554 modpacksApr 2026: 590 modpacksMay 2026: 661 modpacksJun 2026: 552 modpacksJul 2026: 603 modpacksAug 2026: 573 modpacksSep 2026: 553 modpacks
    Oct 2024Oct 2025Sep 2026
    Modpacks that released a new version with this project, each month
    Oct 2024509
    Nov 2024516
    Dec 2024511
    Jan 2025651
    Feb 2025549
    Mar 2025561
    Apr 2025566
    May 2025559
    Jun 2025533
    Jul 2025610
    Aug 2025578
    Sep 2025550
    Oct 2025593
    Nov 2025580
    Dec 2025616
    Jan 2026583
    Feb 2026532
    Mar 2026554
    Apr 2026590
    May 2026661
    Jun 2026552
    Jul 2026603
    Aug 2026573
    Sep 2026553

    12,035 modpacks include BlockUI in at least one of their versions. Here are the 30 most downloaded.

    ModpackDownloadsLast version with it
    All the Mods 10 - ATM1022.5M downloadslast version with it 15 Oct 2026All the Mods 9 - ATM913.7M downloadslast version with it 12 Oct 2025All the Mods 8 - ATM89.3M downloadslast version with it 17 Dec 2023Cisco's Fantasy Medieval RPG [Ultimate]5.1M downloadslast version with it 1 Jun 2026MC Eternal4.9M downloadslast version with it 10 Nov 2022All the Mods 7 - ATM73.1M downloadslast version with it 21 Mar 2024Craft to Exile 2 - 2.0 Atlas Update2.8M downloadslast version with it 10 Sep 2026Slimes Adventure2.1M downloadslast version with it 30 Nov 2025MC Eternal 21.9M downloadslast version with it 16 Sep 2026Valhelsia 61.9M downloadslast version with it 21 Apr 2025
    1 to 10 of 30123

    Often in the same modpacks

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

    ProjectTypeShareGrade
    Multi-PistonCModin 87% of the modpacks with BlockUITownTalkCModin 63% of the modpacks with BlockUIMacaw's TrapdoorsAModin 45% of the modpacks with BlockUIAttributeFixAModin 44% of the modpacks with BlockUIFTB Chunks (NeoForge)AModin 44% of the modpacks with BlockUIMacaw's FurnitureBModin 44% of the modpacks with BlockUIMacaw's RoofsAModin 42% of the modpacks with BlockUIArs NouveauAModin 41% of the modpacks with BlockUIYUNG's Better Desert TemplesAModin 41% of the modpacks with BlockUIMacaw's Lights and LampsBModin 41% of the modpacks with BlockUI
    1 to 10 of 28123

    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·NeoForge1.0.2091.0.209 · blockui-1.0.209-1.21.1.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.20.1·NeoForge1.0.187-snapshot1.0.187-snapshot · blockui-1.20.1-1.0.187-snapshot.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.20.1·Forge1.0.1931.0.193 · blockui-1.20.1-1.0.193.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    Older Minecraft versions
    1.21·NeoForge1.0.192-snapshot1.0.192-snapshot · blockui-1.0.192-1.21.1-snapshot.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.20.4·NeoForge1.0.154-BETA1.0.154-BETA · blockui-1.20.4-1.0.154-BETA.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.20·Forge0.0.84-ALPHA0.0.84-ALPHA · blockui-1.20-0.0.84-ALPHA.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.19.4·Forge0.0.93-ALPHA0.0.93-ALPHA · blockui-1.19.4-0.0.93-ALPHA.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.19.3·Forge0.0.70-ALPHA0.0.70-ALPHA · blockui-1.19.3-0.0.70-ALPHA.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.19.2·Forge1.0.140-BETA1.0.140-BETA · blockui-1.19.2-1.0.140-BETA.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.19 to 1.19.1·Forge0.0.69-ALPHA0.0.69-ALPHA · blockui-1.19-0.0.69-ALPHA.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1 to 10 of 1312

    133 releases

    MinecraftLoaderVersionReleasedSecurityGet it onDownload
    1.21.1·NeoForge1.0.212-snapshot1.0.212-snapshot · blockui-1.0.212-1.21.1-snapshot.jarBeta·11 Oct 2026PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Beta · 457.2 KB
    1.21.1·NeoForge1.0.212-snapshot1.0.212-snapshot · blockui-1.0.212-1.21.1-snapshot.jarBeta·15 Sep 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on CurseForgeDownload · Beta · 457.2 KB
    1.21.1·NeoForge1.0.211-snapshot1.0.211-snapshot · blockui-1.0.211-1.21.1-snapshot.jarBeta·21 Mar 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on CurseForgeDownload · Beta · 457.2 KB
    1.21.1·NeoForge1.0.211-snapshot1.0.211-snapshot · blockui-1.0.211-1.21.1-snapshot.jarBeta·7 Mar 2026PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Beta · 457.2 KB
    1.20.1·Forge1.0.194-snapshot1.0.194-snapshot · blockui-1.20.1-1.0.194-snapshot.jarBeta·10 Feb 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on CurseForgeDownload · Beta · 381.9 KB
    1.21.1·NeoForge1.0.210-snapshot1.0.210-snapshot · blockui-1.0.210-1.21.1-snapshot.jarBeta·10 Feb 2026PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Beta · 457.1 KB
    1.20.1The latest file for its Minecraft version and loader·Forge1.0.1931.0.193 · blockui-1.20.1-1.0.193.jar·28 Jan 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on CurseForgeDownload · Stable · 381.8 KB
    1.21.1The latest file for its Minecraft version and loader·NeoForge1.0.2091.0.209 · blockui-1.0.209-1.21.1.jar·28 Jan 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on CurseForgeDownload · Stable · 457.0 KB
    1.20.1·Forge1.0.193-snapshot1.0.193-snapshot · blockui-1.20.1-1.0.193-snapshot.jarBeta·28 Jan 2026PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Beta · 381.9 KB
    1.21.1·NeoForge1.0.209-snapshot1.0.209-snapshot · blockui-1.0.209-1.21.1-snapshot.jarBeta·28 Jan 2026PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Beta · 457.0 KB
    1.21.1·NeoForge1.0.208-snapshot1.0.208-snapshot · blockui-1.0.208-1.21.1-snapshot.jarBeta·28 Dec 2025PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Beta · 457.0 KB
    1.20.1·Forge1.0.192-snapshot1.0.192-snapshot · blockui-1.20.1-1.0.192-snapshot.jarBeta·28 Dec 2025PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Beta · 381.9 KB
    1.21.1·NeoForge1.0.206-snapshot1.0.206-snapshot · blockui-1.0.206-1.21.1-snapshot.jarBeta·28 Sep 2025PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Beta · 456.9 KB
    1.20.1·Forge1.0.1941.0.194 · blockui-1.20.1-1.0.194.jar·28 Sep 2025PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Stable · 381.8 KB
    1.21.1·NeoForge1.0.205-snapshot1.0.205-snapshot · blockui-1.0.205-1.21.1-snapshot.jarBeta·22 Sep 2025PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Beta · 456.9 KB
    1.21.1·NeoForge1.0.204-snapshot1.0.204-snapshot · blockui-1.0.204-1.21.1-snapshot.jarBeta·9 Aug 2025PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Beta · 457.1 KB
    1.21.1·NeoForge1.0.203-snapshot1.0.203-snapshot · blockui-1.0.203-1.21.1-snapshot.jarBeta·9 Aug 2025PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Beta · 457.1 KB
    1.21.1·NeoForge1.0.2051.0.205 · blockui-1.0.205-1.21.1.jar·13 Jun 2025PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Stable · 457.3 KB
    1.20.1·Forge1.0.1931.0.193 · blockui-1.20.1-1.0.193.jar·13 Jun 2025PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Stable · 381.7 KB
    1.21.1·NeoForge1.0.202-snapshot1.0.202-snapshot · blockui-1.0.202-1.21.1-snapshot.jarBeta·13 Jun 2025PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Beta · 457.3 KB
    1 to 20 of 13312345…7

    Quick fixes

    In the last 2 years, 1 release 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.1

    • blockui-1.0.202-1.21.1-snapshot.jar13 Jun 2025…commit) Fix missing float cast for image rendering…