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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.

    Vertical Slabs Compat

    Mod

    Adds automatic compatibility for Quark's Vertical Slabs.

    A90/ 100
    • OverviewA
    • SecurityPassed
    • PrivacyNone found
    • AINone found
    • CompatibilityUp to 1.21.1
    • ModpacksIn 1,714
    • ReleasesLatest 24 Aug

    Download

    v_slab_compat-1.21.1-3.0-fabric.jar

    Released 24 Aug 2026 · 90.4 KB

    Passed: our checks found nothing harmful in this file.

    Download

    Required to run

    • Moonlight LibAMinecraft 1.21.1 · Fabric (release 3.7.2)
    OverviewSecurityPrivacyAICompatibilityModpacksReleases

    Why grade A

    How grades work

    Strengths

    • Security checks passed
    • Public source code and issue tracker
    • Widely used
    • Around for years

    Points lost

    • Releases in only 2 of the last 24 months−4 points
    • Some modpacks removed it−2 points
    All 11 criteria
    • Maintenance

      4 points lost23 / 27
      Last releaseHow long ago the newest file came out, or an existing file was marked as working on a new Minecraft version.2 months ago (24 Aug 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 Fabric and NeoForge, 1.20.1 on Forge. 53% of the 718 popular Fabric 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 2 of the last 24 months 2 / 6
    • Stability

      2 points lost13 / 15
      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 360 modpacks with two or more versions removed it in a later one (15%) 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.Not measured yet.
      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 · MehVahdJukaar/vertical_slab_compat 7 / 7
      Place to report problemsWhether the project page links to a place where players can report problems: an issue tracker.GitHub issues · MehVahdJukaar/vertical_slab_compat 3 / 3
    • Popularity

      Full points4 / 4
      DownloadsDownloads on Modrinth and CurseForge. Full points from 5 million.20,770,699 4 / 4
    • Track record

      Full points8 / 8
      AgeHow long the project has existed. It counts less when no new file came out recently.3.9 years, 30 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
    Total90 / 100

    57.9 of the 64 points that apply = 90 out of 100. The points above are rounded to whole numbers.

    About

    Vertical Slabs Compat automatically adds Quark-style vertical slab variants for blocks that already have slab versions, filling compatibility gaps without registering variants that are already present. Despite targeting Quark’s vertical slabs, the mod can also be used standalone without Quark. Its scope is limited to vertical slabs; it does not add vertical stairs or other micro-blocks.

    Written from Modrinth and CurseForge . How we write it

    In-game changes

    Does not change the game's code directly.

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

    Often used with it

    See all 30
    YUNG's Better Ocean MonumentsABlueprintAYUNG's Better Nether FortressesAYUNG's Better Witch HutsAServer Performance - Smooth Chunk SaveA

    Details

    Creator
    MehVahdJukaar
    License
    All rights reserved
    Downloads
    20.8M
    Created
    7 Dec 2022
    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.

    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 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.
      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.
      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 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
      8 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
      11 code files read

    Compatibility

    See all 30 files
    Fabric
    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.
    Moonlight LibAFabric APIin some filesA
    OptionalProjects it can work with but does not need. The author lists them.
    QuarkA
    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
    2001000
    Oct 2024: 100 modpacksNov 2024: 109 modpacksDec 2024: 103 modpacksJan 2025: 118 modpacksFeb 2025: 96 modpacksMar 2025: 85 modpacksApr 2025: 89 modpacksMay 2025: 81 modpacksJun 2025: 72 modpacksJul 2025: 78 modpacksAug 2025: 85 modpacksSep 2025: 77 modpacksOct 2025: 73 modpacksNov 2025: 63 modpacksDec 2025: 67 modpacksJan 2026: 76 modpacksFeb 2026: 71 modpacksMar 2026: 52 modpacksApr 2026: 57 modpacksMay 2026: 51 modpacksJun 2026: 51 modpacksJul 2026: 45 modpacksAug 2026: 32 modpacksSep 2026: 40 modpacks
    Oct 2024Oct 2025Sep 2026
    Modpacks that released a new version with this project, each month
    Oct 2024100
    Nov 2024109
    Dec 2024103
    Jan 2025118
    Feb 202596
    Mar 202585
    Apr 202589
    May 202581
    Jun 202572
    Jul 202578
    Aug 202585
    Sep 202577
    Oct 202573
    Nov 202563
    Dec 202567
    Jan 202676
    Feb 202671
    Mar 202652
    Apr 202657
    May 202651
    Jun 202651
    Jul 202645
    Aug 202632
    Sep 202640

    Fewer modpacks put it in their new versions than a year ago: 46 a month now, 80 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..

    1,714 modpacks include Vertical Slabs Compat in at least one of their versions. Here are the 30 most downloaded.

    ModpackDownloadsLast version with it
    Better MC [FORGE] - BMC421.1M downloadslast version with it 9 Oct 2026DeceasedCraft - Urban Zombie Apocalypse9.8M downloadslast version with it 17 Jul 2026Better MC [FORGE] BMC32.5M downloadslast version with it 22 Nov 2023DREAD - A Horror Survival Pack2.4M downloadslast version with it 25 Jul 2026Better Adventures+2.2M downloadslast version with it 20 Oct 2025Valhelsia 61.9M downloadslast version with it 21 Apr 2025Integrated MC1.9M downloadslast version with it 30 Jan 2025Create+1.5M downloadslast version with it 11 May 2024M-Tech1.2M downloadslast version with it 9 Jan 2025Chocolate Edition Minecraft1.1M downloadslast version with it 4 May 2026
    1 to 10 of 30123

    Often in the same modpacks

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

    ProjectTypeShareGrade
    YUNG's Better Ocean MonumentsAModin 60% of the modpacks with Vertical Slabs CompatBlueprintAModin 59% of the modpacks with Vertical Slabs CompatYUNG's Better Nether FortressesAModin 59% of the modpacks with Vertical Slabs CompatYUNG's Better Witch HutsAModin 53% of the modpacks with Vertical Slabs CompatServer Performance - Smooth Chunk SaveAModin 52% of the modpacks with Vertical Slabs CompatYUNG's Better Desert TemplesAModin 52% of the modpacks with Vertical Slabs CompatAmendmentsAModin 51% of the modpacks with Vertical Slabs CompatConnectivityAModin 50% of the modpacks with Vertical Slabs CompatGuard VillagersAModin 50% of the modpacks with Vertical Slabs CompatsparkAModin 50% of the modpacks with Vertical Slabs Compat
    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·Fabric3.03.0 · v_slab_compat-1.21.1-3.0-fabric.jarSends: None foundRequires:Moonlight LibPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.1·NeoForge3.03.0 · v_slab_compat-1.21.1-3.0-neoforge.jarSends: None foundRequires:Moonlight LibPassedOur checks found nothing harmful in this file. Its code was read too.
    1.20.1·Fabric1.20-2.51.20-2.5 · v_slab_compat-1.20-2.5-fabric.jarSends: None foundRequires:Fabric API, Moonlight LibFabric API, Moonlight LibPassedOur checks found nothing harmful in this file. Its code was read too.
    1.20.1·Forge1.20-2.51.20-2.5 · v_slab_compat-1.20-2.5.jarSends: None foundRequires:Moonlight LibPassedOur checks found nothing harmful in this file. Its code was read too.
    Older Minecraft versions
    1.19.2·Fabric99 · v_slab_compat-1.19.2-1.4-fabric.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.19.2·Forge1.91.9 · v_slab_compat-1.19.2-1.9.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.19.1 to 1.19.2·Forge88 · v_slab_compat-1.19.2-1.4.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.19.1·Fabric77 · v_slab_compat-1.19.2-1.3-fabric.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.

    30 releases

    MinecraftLoaderVersionReleasedSecurityGet it onDownload
    1.21.1The latest file for its Minecraft version and loader·Fabric3.03.0 · v_slab_compat-1.21.1-3.0-fabric.jar (main file)·24 Aug 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 90.4 KB
    1.21.1The latest file for its Minecraft version and loader·NeoForge3.03.0 · v_slab_compat-1.21.1-3.0-neoforge.jar (main file)·24 Aug 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 92.5 KB
    1.20.1The latest file for its Minecraft version and loader·Forge1.20-2.51.20-2.5 · v_slab_compat-1.20-2.5.jar (main file)·15 Jan 2025PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 92.5 KB
    1.20.1The latest file for its Minecraft version and loader·Fabric1.20-2.51.20-2.5 · v_slab_compat-1.20-2.5-fabric.jar (main file)·15 Jan 2025PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 91.0 KB
    1.20.1·Forge1.20-2.41.20-2.4 · v_slab_compat-1.20-2.4.jar (main file)·4 Sep 2024PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 92.5 KB
    1.20.1·Fabric1.20-2.41.20-2.4 · v_slab_compat-1.20-2.4-fabric.jar (main file)·4 Sep 2024PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 91.0 KB
    1.20.1·Forge1.20-2.31.20-2.3 · v_slab_compat-1.20-2.3.jar·10 Jan 2024PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 95.0 KB
    1.20.1·Fabric1.20-2.31.20-2.3 · v_slab_compat-1.20-2.3-fabric.jar·10 Jan 2024PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 93.4 KB
    1.20.1·Forge1.20-2.21.20-2.2 · v_slab_compat-1.20-2.2.jar·21 Dec 2023PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 95.0 KB
    1.20.1·Fabric1.20-2.21.20-2.2 · v_slab_compat-1.20-2.2-fabric.jar·21 Dec 2023PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 92.7 KB
    1.20.1·Forge1.20-2.11.20-2.1 · v_slab_compat-1.20-2.1.jar·16 Dec 2023PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 93.9 KB
    1.20.1·Fabric1.20-2.11.20-2.1 · v_slab_compat-1.20-2.1-fabric.jar·16 Dec 2023PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 92.3 KB
    1.20.1·Forge1.20-2.01.20-2.0 · v_slab_compat-1.20-2.0.jar·10 Dec 2023PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 92.0 KB
    1.20.1·Fabric1.20-2.01.20-2.0 · v_slab_compat-1.20-2.0-fabric.jar·10 Dec 2023PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 90.6 KB
    1.20.1·Forge1.20-1.51.20-1.5 · v_slab_compat-1.20-1.5.jar·10 Dec 2023PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 84.7 KB
    1.20.1·Fabric1.20-1.51.20-1.5 · v_slab_compat-1.20-1.5-fabric.jar·10 Dec 2023PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 83.5 KB
    1.19.2The latest file for its Minecraft version and loader·Forge1.91.9 · v_slab_compat-1.19.2-1.9.jar·20 Oct 2023PassedOur checks found nothing harmful in this file. Its code was read too.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 85.5 KB
    1.19.2·Forge1.81.8 · v_slab_compat-1.19.2-1.8.jar·20 Oct 2023PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 85.1 KB
    1.19.2·Forge1.71.7 · v_slab_compat-1.19.2-1.7.jar·20 Oct 2023PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 85.0 KB
    1.19.2·Forge1.61.6 · v_slab_compat-1.19.2-1.6.jar·19 Oct 2023PassedOur checks found nothing harmful in this file.Not on ModrinthOpen this file on CurseForgeDownload · Stable · 85.0 KB
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