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    2,055,807 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 2026.269,833 projects gradedProjects with a letter from A to F. Counted on 25 Oct 2026.
    How it worksMalware we foundAPIAboutPrivacyTermsContact

    © 2026 ModgradeNot an official Minecraft product. Not approved by or associated with Mojang or Microsoft.

    Outbreak: Apocalyptic Bioweapons | Killing Floor | Left 4 Dead

    Mod

    Brutal, gruesome, and challenging. An outbreak of failed bioweapons invades your world.

    B82/ 100
    Security
    Not checked yet
    Privacy
    Not read yet
    Loaders
    Forge, NeoForge
    Minecraft versions
    Up to 1.21.1
    • OverviewB
    • SecurityNot checked yet
    • PrivacyNot read yet
    • AINone found
    • CompatibilityUp to 1.21.1
    • ModpacksIn 53
    • ReleasesLatest 22 Jul

    Download

    outbreak_kf-1.1.0-neoforge-1.21.1.jar

    Released 22 Jul 2026 · 6.1 MB

    Not checked: its author does not let other sites download this file from CurseForge, so we cannot check it.

    Open on CurseForge
    OverviewSecurityPrivacyAICompatibilityModpacksReleases

    Why grade B

    How grades work

    Points lost

    • No source code link−7 points
    • Releases in only 6 of the last 24 months−1 point
    • Some modpacks removed it−1 point
    • Releases replaced within 3 days to fix a problem−1 point
    • Under 5 million downloads−1 point
    • First release only 11 months ago−1 point
    All 11 criteria

    • Maintenance

      1 point lost26 / 27
      Last releaseHow long ago the newest file came out, or an existing file was marked as working on a new Minecraft version.3 months ago (22 Jul 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 6 of the last 24 months 5 / 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.4 of the 32 modpacks with two or more versions removed it in a later one (13%) See the 4 modpacks9 / 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 20 releases in 2 years needed a quick fix (15%) See the 3 releases6 / 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

      7 points lost0 / 7
      Source codeWhether the project page links to its source code, so anyone can read what it does.No link on the project page 0 / 7
      Place to report problemsWhether the project page links to a place where players can report problems: an issue tracker.Does not apply. Not counted for projects only on CurseForge.

    • Popularity

      1 point lost3 / 4
      DownloadsDownloads on Modrinth and CurseForge. Full points from 5 million.129,128 3 / 4

    • Track record

      1 point lost7 / 8
      AgeHow long the project has existed. It counts less when no new file came out recently.11 months, 30 releases 7 / 8

    • Security

      Not checked
      File checksThis check adds no points. It can only take points away.Not checked: CurseForge does not let other apps download this project's files. B at most. See Security
    Total82 / 100

    55.5 of the 68 points that apply = 82 out of 100. The points above are rounded to whole numbers.

    Images

    • Footage - Melee Headshot
    • Footage - Crowd Headshot
    • Footage - Dodging
    • Footage - Horde
    • Footage - Pounded
    • Cyst
    • Clot
    • Crawler
    • Gorefast
    • Stalker
    • Spitter
    • Bloat
    • Husk
    • Siren
    • Gorefiend
    • Scrake
    • Witch
    • Fleshpound
    • Horzine Mark 7 Suit
    • DJ Scully Outfit

    About

    Outbreak adds apocalyptic monsters inspired by Killing Floor to Minecraft, providing hostile creatures for zombie-apocalypse worlds and modpacks. Its roster includes swarming Cysts and Clots, fast Gorefasts, wall-climbing Crawlers, nearly invisible Stalkers, toxic Spitters, acid-spitting Bloats, fireball-firing Husks, and Sirens whose screams strike in every direction. More dangerous threats include chainsaw-wielding Scrakes, relentlessly aggressive Witches, and fast, durable Fleshpounds that can be immobilized with traps and are especially vulnerable to explosives. Headshots can rip monsters’ heads off, while the creatures’ distinct behaviors encourage tactics such as sidestepping ranged attacks, keeping distance, or facing the strongest enemies in groups. Monsters drop Bio Samples, which can be combined with string to make Bio Fabric for equipment crafting; killing large monsters also yields Armor Scrap. The mod adds armor and outfits including Horzine Mark 7 Armor, the DJ Scully Outfit, the Foundry Worker Outfit, and the Mr. Foster Outfit, and lets players adjust mob health and damage in a configuration file.

    Written from CurseForge . How we write it

    Details

    Creator
    Fyrrage
    License
    Not known
    Downloads
    129K
    Created
    30 Nov 2025
    Official page
    CurseForge

    Security

    Not checked yet

    Its author does not let other sites download its files from CurseForge, so we cannot check 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 · Not checked yet
    • 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. Both are 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. 2 of them are not checked yet. See each file in Releases

    Privacy

    We have not read its code yet

    What it sends is not known yet.

    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 · Code not read yet
    • 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.
      None yet. See each file in Releases

    AI

    No sign so far that AI was used to make it

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

    We have not read its files, images and sounds yet.

    AI in the game: not checked yet

    We have not read its code for AI yet.

    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 · 1 place 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.
    • 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.
      Not read yet
    • Images in its filesHidden data in the images of the files you download, where AI image tools write their name and settings.
      Not read yet
    • Sounds in its filesThe tags of the sound files in the files you download, where some AI music tools write their name.
      Not read yet
    • 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.
      Not checked for AI yet.

    Compatibility

    See all 30 files
    NeoForge
    Forge
    1.201.2126.126.3

    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.

    Modpacks using this project

    Find modpacks with it
    Modpacks that released a new version with this project, each month
    20100
    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: 0 modpacksAug 2025: 0 modpacksSep 2025: 0 modpacksOct 2025: 0 modpacksNov 2025: 0 modpacksDec 2025: 1 modpackJan 2026: 3 modpacksFeb 2026: 5 modpacksMar 2026: 14 modpacksApr 2026: 13 modpacksMay 2026: 11 modpacksJun 2026: 9 modpacksJul 2026: 13 modpacksAug 2026: 8 modpacksSep 2026: 5 modpacks
    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 20250
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    Oct 20250
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    Dec 20251
    Jan 20263
    Feb 20265
    Mar 202614
    Apr 202613
    May 202611
    Jun 20269
    Jul 202613
    Aug 20268
    Sep 20265

    More modpacks put it in their new versions than a year ago: 10 a month now, 0 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..

    53 modpacks include Outbreak: Apocalyptic Bioweapons | Killing Floor | Left 4 Dead in at least one of their versions. Here are the 30 most downloaded.

    ModpackDownloadsLast version with it
    Zombie Apocalypse: Last Days in the Wasteland | Survive Hordes of Zombies123K downloadslast version with it 14 Oct 2026Frozen Apocalypse | Survive the Ice Age Apocalypse120K downloadslast version with it 22 Oct 2026Z Apocalypse - A Modern Zombie Apocalypse15K downloadslast version with it 8 Oct 2026Beyond Extinction14K downloadslast version with it 20 Oct 2026Zurvive - Immersive Warfare4.5K downloadslast version with it 3 Jul 2026B i o m e c h 4.3K downloadslast version with it 29 May 2026Gordos Lucky Block adventure2.1K downloadslast version with it 9 Jan 2026CopperNetwork Official Pack1.9K downloadslast version with it 20 Jul 2026Survivors: Annihilation II1.8K downloadslast version with it 11 Aug 2026Project Z - Zombie Apocalypse 1.4K downloadslast version with it 15 Sep 2026
    1 to 10 of 30123

    Often in the same modpacks

    Mods that modpacks often add together with Outbreak: Apocalyptic Bioweapons | Killing Floor | Left 4 Dead. Share: how many of the modpacks with Outbreak: Apocalyptic Bioweapons | Killing Floor | Left 4 Dead also have that mod.

    ProjectTypeShareGrade
    [TaCZ] Timeless and Classics ZeroAModin 62% of the modpacks with Outbreak: Apocalyptic Bioweapons | Killing Floor | Left 4 DeadMrCrayfish's Furniture Mod: RefurbishedAModin 60% of the modpacks with Outbreak: Apocalyptic Bioweapons | Killing Floor | Left 4 DeadZombie AwarenessCModin 57% of the modpacks with Outbreak: Apocalyptic Bioweapons | Killing Floor | Left 4 DeadHorror Element ModBModin 53% of the modpacks with Outbreak: Apocalyptic Bioweapons | Killing Floor | Left 4 DeadImmersive Weathering [FORGE]CModin 53% of the modpacks with Outbreak: Apocalyptic Bioweapons | Killing Floor | Left 4 DeadThe Lost CitiesAModin 53% of the modpacks with Outbreak: Apocalyptic Bioweapons | Killing Floor | Left 4 Dead[TACZ] LesRaisins Tactical EquipementsAModin 51% of the modpacks with Outbreak: Apocalyptic Bioweapons | Killing Floor | Left 4 DeadSecurityCraftAModin 49% of the modpacks with Outbreak: Apocalyptic Bioweapons | Killing Floor | Left 4 DeadKeerdm's Zombie Apocalypse EssentialsCModin 47% of the modpacks with Outbreak: Apocalyptic Bioweapons | Killing Floor | Left 4 DeadDoomsday DecorationCModin 45% of the modpacks with Outbreak: Apocalyptic Bioweapons | Killing Floor | Left 4 Dead
    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·NeoForge1.1.01.1.0 · outbreak_kf-1.1.0-neoforge-1.21.1.jarSends: Not read yetRequires:NothingNot checkedWe have not checked this file yet.
    1.20.1·Forge1.1.01.1.0 · outbreak_kf-1.1.0-forge-1.20.1.jarSends: Not read yetRequires:NothingNot checkedWe have not checked this file yet.

    30 releases

    MinecraftLoaderVersionReleasedSecurityGet it onDownload
    1.21.1The latest file for its Minecraft version and loader·NeoForge1.1.01.1.0 · outbreak_kf-1.1.0-neoforge-1.21.1.jar·22 Jul 2026Not checkedIts author does not let other sites download this file from CurseForge, so we cannot check it.Open this file on CurseForgeDownload not available hereIts author does not let other sites download this file. Get it on CurseForge: its logo in "Get it on" opens the file's page.
    1.20.1The latest file for its Minecraft version and loader·Forge1.1.01.1.0 · outbreak_kf-1.1.0-forge-1.20.1.jar·22 Jul 2026Not checkedIts author does not let other sites download this file from CurseForge, so we cannot check it.Open this file on CurseForgeDownload not available hereIts author does not let other sites download this file. Get it on CurseForge: its logo in "Get it on" opens the file's page.
    1.20.1·Forge1.0.41.0.4 · outbreak_kf-1.0.4-forge-1.20.1.jar·30 Apr 2026Not checkedIts author does not let other sites download this file from CurseForge, so we cannot check it.Open this file on CurseForgeDownload not available hereIts author does not let other sites download this file. Get it on CurseForge: its logo in "Get it on" opens the file's page.
    1.21.1·NeoForge1.0.41.0.4 · outbreak_kf-1.0.4-neoforge-1.21.1.jar·30 Apr 2026Not checkedIts author does not let other sites download this file from CurseForge, so we cannot check it.Open this file on CurseForgeDownload not available hereIts author does not let other sites download this file. Get it on CurseForge: its logo in "Get it on" opens the file's page.
    1.21.1·NeoForge1.0.3.21.0.3.2 · outbreak_kf-1.0.3.2-neoforge-1.21.1.jar·27 Feb 2026Not checkedIts author does not let other sites download this file from CurseForge, so we cannot check it.Open this file on CurseForgeDownload not available hereIts author does not let other sites download this file. Get it on CurseForge: its logo in "Get it on" opens the file's page.
    1.20.1·Forge1.0.3.21.0.3.2 · outbreak_kf-1.0.3.2-forge-1.20.1.jar·27 Feb 2026Not checkedIts author does not let other sites download this file from CurseForge, so we cannot check it.Open this file on CurseForgeDownload not available hereIts author does not let other sites download this file. Get it on CurseForge: its logo in "Get it on" opens the file's page.
    1.21.1·NeoForge1.0.3.1-hotfix1.0.3.1-hotfix · outbreak_kf-1.0.3.1-hotfix-neoforge-1.21.1.jar·9 Feb 2026Not checkedIts author does not let other sites download this file from CurseForge, so we cannot check it.Open this file on CurseForgeDownload not available hereIts author does not let other sites download this file. Get it on CurseForge: its logo in "Get it on" opens the file's page.
    1.20.1·Forge1.0.3.1-hotfix1.0.3.1-hotfix · outbreak_kf-1.0.3.1-hotfix-forge-1.20.1.jar·9 Feb 2026Not checkedIts author does not let other sites download this file from CurseForge, so we cannot check it.Open this file on CurseForgeDownload not available hereIts author does not let other sites download this file. Get it on CurseForge: its logo in "Get it on" opens the file's page.
    1.21.1·NeoForge1.0.31.0.3 · outbreak_kf-1.0.3-neoforge-1.21.1.jar·8 Feb 2026Not checkedIts author does not let other sites download this file from CurseForge, so we cannot check it.Open this file on CurseForgeDownload not available hereIts author does not let other sites download this file. Get it on CurseForge: its logo in "Get it on" opens the file's page.
    1.20.1·Forge1.0.31.0.3 · outbreak_kf-1.0.3-forge-1.20.1.jar·8 Feb 2026Not checkedIts author does not let other sites download this file from CurseForge, so we cannot check it.Open this file on CurseForgeDownload not available hereIts author does not let other sites download this file. Get it on CurseForge: its logo in "Get it on" opens the file's page.
    1.20.1·Forge1.0.2.21.0.2.2 · outbreak_kf-1.0.2.2-forge-1.20.1.jar·21 Jan 2026Not checkedIts author does not let other sites download this file from CurseForge, so we cannot check it.Open this file on CurseForgeDownload not available hereIts author does not let other sites download this file. Get it on CurseForge: its logo in "Get it on" opens the file's page.
    1.21.1·NeoForge1.0.2.21.0.2.2 · outbreak_kf-1.0.2.2-neoforge-1.21.1.jar·21 Jan 2026Not checkedIts author does not let other sites download this file from CurseForge, so we cannot check it.Open this file on CurseForgeDownload not available hereIts author does not let other sites download this file. Get it on CurseForge: its logo in "Get it on" opens the file's page.
    1.20.1·Forge1.0.2.11.0.2.1 · outbreak_kf-1.0.2.1-forge-1.20.1.jar·8 Jan 2026Not checkedIts author does not let other sites download this file from CurseForge, so we cannot check it.Open this file on CurseForgeDownload not available hereIts author does not let other sites download this file. Get it on CurseForge: its logo in "Get it on" opens the file's page.
    1.21.1·NeoForge1.0.2.11.0.2.1 · outbreak_kf-1.0.2.1-neoforge-1.21.1.jar·8 Jan 2026Not checkedIts author does not let other sites download this file from CurseForge, so we cannot check it.Open this file on CurseForgeDownload not available hereIts author does not let other sites download this file. Get it on CurseForge: its logo in "Get it on" opens the file's page.
    1.21.1·NeoForge1.0.21.0.2 · outbreak_kf-1.0.2-neoforge-1.21.1.jar·4 Jan 2026Not checkedIts author does not let other sites download this file from CurseForge, so we cannot check it.Open this file on CurseForgeDownload not available hereIts author does not let other sites download this file. Get it on CurseForge: its logo in "Get it on" opens the file's page.
    1.20.1·Forge1.0.21.0.2 · outbreak_kf-1.0.2-forge-1.20.1.jar·4 Jan 2026Not checkedIts author does not let other sites download this file from CurseForge, so we cannot check it.Open this file on CurseForgeDownload not available hereIts author does not let other sites download this file. Get it on CurseForge: its logo in "Get it on" opens the file's page.
    1.21.1·NeoForge1.0.11.0.1 · outbreak_kf-1.0.1-neoforge-1.21.1.jar·20 Dec 2025Not checkedIts author does not let other sites download this file from CurseForge, so we cannot check it.Open this file on CurseForgeDownload not available hereIts author does not let other sites download this file. Get it on CurseForge: its logo in "Get it on" opens the file's page.
    1.20.1·Forge1.0.11.0.1 · outbreak_kf-1.0.1-forge-1.20.1.jar·20 Dec 2025Not checkedIts author does not let other sites download this file from CurseForge, so we cannot check it.Open this file on CurseForgeDownload not available hereIts author does not let other sites download this file. Get it on CurseForge: its logo in "Get it on" opens the file's page.
    1.21.1·NeoForge1.0.01.0.0 · outbreak_kf-1.0.0-neoforge-1.21.1.jar·17 Dec 2025Not checkedIts author does not let other sites download this file from CurseForge, so we cannot check it.Open this file on CurseForgeDownload not available hereIts author does not let other sites download this file. Get it on CurseForge: its logo in "Get it on" opens the file's page.
    1.20.1·Forge1.0.01.0.0 · outbreak_kf-1.0.0-forge-1.20.1.jar·17 Dec 2025Not checkedIts author does not let other sites download this file from CurseForge, so we cannot check it.Open this file on CurseForgeDownload not available hereIts author does not let other sites download this file. Get it on CurseForge: its logo in "Get it on" opens the file's page.
    1 to 20 of 3012

    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 1 point.

    See them, newest first
    • outbreak_kf-1.0.3.1-hotfix-forge-1.20.1.jar9 Feb 2026fixed crash on launching the game Adjusted spawn…
    • outbreak_kf-0.9.7-forge-1.20.1.jar4 Dec 2025…/ downward) - fixed a crash where Husk's target gets killed before he can…
    • outbreak_kf-0.9.3-hotfix-forge-1.20.1.jar1 Dec 2025Fixed Fleshpound's AI & animation transitions