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    2,053,304 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 2026.269,472 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.

    Mermod

    Mod

    Adds a magical necklace that transforms you into a merperson in water.

    A91/ 100
    • OverviewA
    • SecurityPassed
    • PrivacyNone found
    • AINone found
    • CompatibilityUp to 1.21.11
    • ModpacksIn 372
    • ReleasesLatest 9 Aug

    Download

    mermod-fabric-4.0.2+1.21.11.jar

    Released 9 Aug 2026 · 734.3 KB

    Passed: our checks found nothing harmful in this file.

    Download

    Required to run

    • Architectury APIAMinecraft 1.21.11 · Fabric (release 19.0.1)
    • Fabric APIAMinecraft 1.21.11 · Fabric (release 0.141.6)
    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 4 of the last 24 months−3 points
    • Releases replaced within 3 days to fix a problem−3 points
    All 11 criteria

    • Maintenance

      3 points lost24 / 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 (9 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.1.21.11 on NeoForge and Fabric, 1.20.4 on Forge. 15% or more of the popular mods updated in the last 6 months also have files for 1.21.11. 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

      3 points lost19 / 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.12 of the 275 modpacks with two or more versions removed it in a later one (4%) 10 / 10
      Quick fixesHow often a release needed a quick fix: a new release within 3 days to fix a problem in it.2 of its 8 releases in 2 years needed a quick fix (25%) See the 2 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.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 · ThatPreston/Mermod 7 / 7
      Place to report problemsWhether the project page links to a place where players can report problems: an issue tracker.GitHub issues · ThatPreston/Mermod 3 / 3

    • Popularity

      Full points4 / 4
      DownloadsDownloads on Modrinth and CurseForge. Full points from 5 million.4,447,589 4 / 4

    • Track record

      Full points8 / 8
      AgeHow long the project has existed. It counts less when no new file came out recently.5.6 years, 58 releases 8 / 8

    • Security

      Passed
      File checksThis check adds no points. It can only take points away.Our checks found nothing harmful in all 8 latest files for recent Minecraft versions. See Security
    Total91 / 100

    64.5 of the 71 points that apply = 91 out of 100. The points above are rounded to whole numbers.

    About

    Mermod adds the Sea Necklace, a magical accessory that transforms its wearer into a merperson when they enter water, with faster swimming, clearer underwater vision, night vision, and water breathing. The necklace can be worn in a special slot with Trinkets or in the chestplate slot without it, and dyes can change the necklace and resulting tail color. Optional modifiers customize the transformation: Mermaid Bra changes the torso appearance, Tail Gradient fades the tail to a second color, Glowing Pearl makes it shimmer, and Moon Rock or Ursula’s Shell give it distinctive themed looks. Tail Moisturizer lets merpersons travel on dry land without turning back into legs.

    In-game changes

    Changes the game's code in 4 areas: Rendering and graphicsChanges 6 game code files in this area: drawing mobs, items, particles and textures on screen., PlayerChanges 1 game code file in this area: your character: movement, abilities, hunger and controls., Mobs and their behaviorChanges 1 game code file in this area: mobs, animals, villagers, projectiles and how they move and act. and Inventory and itemsChanges 1 game code file in this area: items, chests and other containers, crafting and enchanting..

    A library packed inside it changes 2 more game code files: Forge Config API Port.

    Adds 9 items and 10 recipes.

    Counted from the names and data files in the mod, so the list may not be complete.

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

    Often used with it

    See all 30
    Mod MenuAFerriteCoreALithiumAOriginsAChat HeadsA

    Details

    Creator
    thatpreston
    License
    Mozilla Public License 2.0
    Downloads
    4.5M
    Created
    30 Mar 2021
    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. 3 files in your config folder.
    Connects to the internet
    It has code that can go online, for example to check for updates, load skins or send crash reports. Only in its files for Fabric 1.20.1 to 1.21.11. See Privacy

    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 26 latest files 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.
      26 latest files: the newest file for each Minecraft version and loader. The answer above is about the 8 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.
      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 8 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 8 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
      32 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
      24 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
      70 code files read

    Compatibility

    See all 58 files
    Fabric
    NeoForge
    Forge
    1.161.191.2126.1

    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.
    Architectury APIAFabric APIon FabricA
    OptionalProjects it can work with but does not need. The author lists them.
    Cloth Config APIATrinkets Updatedin some filesACurios APIon NeoForgeAAccessoriesin some filesAFigurain some filesBTrinketsin some filesCOriginsin some filesA
    IncludesProjects packed inside its files.
    Forge Config API Porton FabricA
    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 1.21.11. Many recently updated mods still support 1.21.11.

    Modpacks using this project

    Find modpacks with it
    Modpacks that released a new version with this project, each month
    30150
    Oct 2024: 10 modpacksNov 2024: 12 modpacksDec 2024: 12 modpacksJan 2025: 15 modpacksFeb 2025: 8 modpacksMar 2025: 11 modpacksApr 2025: 12 modpacksMay 2025: 16 modpacksJun 2025: 12 modpacksJul 2025: 15 modpacksAug 2025: 16 modpacksSep 2025: 19 modpacksOct 2025: 21 modpacksNov 2025: 18 modpacksDec 2025: 20 modpacksJan 2026: 22 modpacksFeb 2026: 20 modpacksMar 2026: 11 modpacksApr 2026: 6 modpacksMay 2026: 12 modpacksJun 2026: 17 modpacksJul 2026: 13 modpacksAug 2026: 9 modpacksSep 2026: 12 modpacks
    Oct 2024Oct 2025Sep 2026
    Modpacks that released a new version with this project, each month
    Oct 202410
    Nov 202412
    Dec 202412
    Jan 202515
    Feb 20258
    Mar 202511
    Apr 202512
    May 202516
    Jun 202512
    Jul 202515
    Aug 202516
    Sep 202519
    Oct 202521
    Nov 202518
    Dec 202520
    Jan 202622
    Feb 202620
    Mar 202611
    Apr 20266
    May 202612
    Jun 202617
    Jul 202613
    Aug 20269
    Sep 202612

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

    ModpackDownloadsLast version with it
    DarkRPG - RPG with Magic, Origins, Quests, Adventure3.9M downloadslast version with it 24 Oct 2026BigChadGuys Plus2.4M downloadslast version with it 14 Oct 2026Fantasy MC Fabric1.9M downloadslast version with it 24 Apr 2025OriginsSMP698K downloadslast version with it 7 Oct 2021Another Quality Modpack 2 - AQM2627K downloadslast version with it 4 Sep 2025Cobblemon Academy (Legacy)416K downloadslast version with it 8 Jan 2026Euphoric Curiosity162K downloadslast version with it 29 Apr 2021VShojoCraft26K downloadslast version with it 1 Jul 2024Arkensia - The Ultimate Cobblemon Adventure26K downloadslast version with it 21 Feb 2026ATR120K downloadslast version with it 14 Oct 2021
    1 to 10 of 30123

    Often in the same modpacks

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

    ProjectTypeShareGrade
    Mod MenuAModin 69% of the modpacks with MermodFerriteCoreAModin 64% of the modpacks with MermodLithiumAModin 62% of the modpacks with MermodOriginsAModin 54% of the modpacks with MermodChat HeadsAModin 53% of the modpacks with MermodHandcraftedCModin 49% of the modpacks with MermodLambDynamicLights - Dynamic LightsAModin 48% of the modpacks with MermodBetterEndBModin 48% of the modpacks with MermodsparkAModin 47% of the modpacks with MermodSodium ExtraAModin 46% of the modpacks with Mermod
    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
    1.21.11·Fabric4.0.24.0.2 · mermod-fabric-4.0.2+1.21.11.jarSends: None foundRequires:Architectury API, Fabric APIArchitectury API, Fabric APIPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.11·NeoForge4.0.24.0.2 · mermod-neoforge-4.0.2+1.21.11.jarSends: None foundRequires:Architectury APIPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.4·Fabric3.4.03.4.0 · mermod-fabric-3.4.0+1.21.4.jarSends: None foundRequires:Architectury API, Fabric APIArchitectury API, Fabric APIPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.4·NeoForge3.4.03.4.0 · mermod-neoforge-3.4.0+1.21.4.jarSends: None foundRequires:Architectury APIPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.1·Fabric3.3.23.3.2 · mermod-fabric-3.3.2+1.21.1.jarSends: None foundRequires:Architectury API, Fabric APIArchitectury API, Fabric APIPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.1·NeoForge3.3.23.3.2 · mermod-neoforge-3.3.2+1.21.1.jarSends: None foundRequires:Architectury APIPassedOur checks found nothing harmful in this file. Its code was read too.
    1.20.1·Fabric3.0.33.0.3 · mermod-fabric-3.0.3+1.20.1.jarSends: None foundRequires:Architectury API, Fabric APIArchitectury API, Fabric APIPassedOur checks found nothing harmful in this file. Its code was read too.
    1.20.1·NeoForge, Forge3.0.33.0.3 · mermod-forge-3.0.3+1.20.1.jarSends: None foundRequires:Architectury APIPassedOur checks found nothing harmful in this file. Its code was read too.
    Older Minecraft versions
    1.20.6·Fabric3.2.13.2.1 · mermod-fabric-1.20.6-3.2.1.jarSends: None foundRequires:Architectury APIPassedOur checks found nothing harmful in this file. Its code was read too.
    1.20.6·NeoForge3.2.13.2.1 · mermod-neoforge-1.20.6-3.2.1.jarSends: None foundRequires:Architectury APIPassedOur checks found nothing harmful in this file. Its code was read too.
    1 to 10 of 26123

    58 releases

    MinecraftLoaderVersionReleasedSecurityGet it onDownload
    1.21.11The latest file for its Minecraft version and loader·NeoForge4.0.24.0.2 · mermod-neoforge-4.0.2+1.21.11.jar (main file)·9 Aug 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthNot on CurseForgeDownload · Stable · 173.2 KB
    1.21.11The latest file for its Minecraft version and loader·Fabric4.0.24.0.2 · mermod-fabric-4.0.2+1.21.11.jar (main file)·9 Aug 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 734.3 KB
    1.20.1The latest file for its Minecraft version and loader·Fabric3.0.33.0.3 · mermod-fabric-3.0.3+1.20.1.jar (main file)·9 Aug 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 508.0 KB
    1.20.1The latest file for its Minecraft version and loader·Forge, NeoForge3.0.33.0.3 · mermod-forge-3.0.3+1.20.1.jar (main file)·9 Aug 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthNot on CurseForgeDownload · Stable · 321.0 KB
    1.21.11·Fabric4.0.14.0.1 · mermod-fabric-4.0.1+1.21.11.jar (main file)·18 Mar 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 730.1 KB
    1.21.11·NeoForge4.0.14.0.1 · mermod-neoforge-4.0.1+1.21.11.jar (main file)·18 Mar 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthNot on CurseForgeDownload · Stable · 168.7 KB
    1.20.1·Fabric3.0.23.0.2 · mermod-fabric-3.0.2+1.20.1.jar (main file)·16 Mar 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 504.3 KB
    1.20.1·Forge, NeoForge3.0.23.0.2 · mermod-forge-3.0.2+1.20.1.jar (main file)·16 Mar 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthNot on CurseForgeDownload · Stable · 317.3 KB
    1.21.11·NeoForge4.0.04.0.0 · mermod-neoforge-4.0.0+1.21.11.jar (main file)·16 Mar 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthNot on CurseForgeDownload · Stable · 168.7 KB
    1.21.11·Fabric4.0.04.0.0 · mermod-fabric-4.0.0+1.21.11.jar (main file)·16 Mar 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 730.1 KB
    1.21.1The latest file for its Minecraft version and loader·NeoForge3.3.23.3.2 · mermod-neoforge-3.3.2+1.21.1.jar (main file)·7 Sep 2025PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthNot on CurseForgeDownload · Stable · 156.1 KB
    1.21.1The latest file for its Minecraft version and loader·Fabric3.3.23.3.2 · mermod-fabric-3.3.2+1.21.1.jar (main file)·7 Sep 2025PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 744.1 KB
    1.21.4The latest file for its Minecraft version and loader·NeoForge3.4.03.4.0 · mermod-neoforge-3.4.0+1.21.4.jar (main file)·6 Sep 2025PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthNot on CurseForgeDownload · Stable · 163.0 KB
    1.21.4The latest file for its Minecraft version and loader·Fabric3.4.03.4.0 · mermod-fabric-3.4.0+1.21.4.jar (main file)·6 Sep 2025PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 758.6 KB
    1.21.1·NeoForge3.3.13.3.1 · mermod-neoforge-1.21.1-3.3.1.jar (main file)·30 Jan 2025PassedOur checks found nothing harmful in this file.Open this file on ModrinthNot on CurseForgeDownload · Stable · 153.6 KB
    1.20.6The latest file for its Minecraft version and loader·NeoForge3.2.13.2.1 · mermod-neoforge-1.20.6-3.2.1.jar (main file)·30 Jan 2025PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthNot on CurseForgeDownload · Stable · 153.9 KB
    1.21.1·Fabric3.3.13.3.1 · mermod-fabric-1.21.1-3.3.1.jar (main file)·30 Jan 2025PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 741.5 KB
    1.20.6The latest file for its Minecraft version and loader·Fabric3.2.13.2.1 · mermod-fabric-1.20.6-3.2.1.jar (main file)·30 Jan 2025PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 549.8 KB
    1.21.1·NeoForge3.3.03.3.0 · mermod-neoforge-1.21.1-3.3.0.jar (main file)·30 Jan 2025PassedOur checks found nothing harmful in this file.Open this file on ModrinthNot on CurseForgeDownload · Stable · 153.5 KB
    1.21.1·Fabric3.3.03.3.0 · mermod-fabric-1.21.1-3.3.0.jar (main file)·30 Jan 2025PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 741.5 KB
    1 to 20 of 58123

    Quick fixes

    In the last 2 years, 2 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.2

    • 4.0.1-neoforge+1.21.1118 Mar 2026Fixed tail rendering issues with shaders - Fixed the tail glint…
    • 3.2.130 Jan 2025Fixed crafting recipes