ViaFabric
ModConnect to servers running different versions of the game.
Why gradeA
How grades workStrengths
Points lost
- Many modpacks removed it−5 points
All 11 criteria
Maintenance
Full points27 / 27Last releaseHow long ago the newest file came out, or an existing file was marked as working on a new Minecraft version.2 days ago (22 Oct 2026) 12 / 12Supports 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.26.3 on Fabric (latest) 9 / 9Regular releasesIn how many of the last 24 months a new file came out. Full points at 8 months.Releases in 19 of the last 24 months 6 / 6Stability
5 points lost17 / 22Removed 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 212 modpacks with two or more versions removed it in a later one (25%) See the 53 modpacks5 / 10Quick fixesHow often a release needed a quick fix: a new release within 3 days to fix a problem in it.No quick fix in 2 years 7 / 7Known 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 of the 4 known conflicts count in the grade See the 4 known conflicts5 / 5Transparency
Full points10 / 10Source codeWhether the project page links to its source code, so anyone can read what it does.GitHub · ViaVersion/ViaFabric 7 / 7Place to report problemsWhether the project page links to a place where players can report problems: an issue tracker.GitHub issues · viaversion/viafabric 3 / 3Popularity
Full points4 / 4DownloadsDownloads on Modrinth and CurseForge. Full points from 5 million.3,238,646 4 / 4Track record
Full points8 / 8AgeHow long the project has existed. It counts less when no new file came out recently.6.3 years, 517 releases 8 / 8Security
PassedFile checksThis check adds no points. It can only take points away.Our checks found nothing harmful in all 11 latest files for recent Minecraft versions. See Security
65.9 of the 71 points that apply = 93 out of 100. The points above are rounded to whole numbers.
Images
About
ViaFabric implements ViaVersion for Fabric clients and servers, allowing them to connect across different Minecraft protocol versions, including in LAN worlds. Its core approach translates network packets, providing cross-version connectivity without the deeper client-side changes made by ViaFabricPlus. With ViaVersion, newer clients can connect to older servers; adding ViaBackwards, and optionally ViaRewind, enables older clients to connect to newer servers, while ViaAprilFools adds support for April Fools versions. Servers can also receive a player's protocol version through a custom payload, for use in anti-cheat checks or version-dependent server logic. The mod includes settings for choosing a global or per-server protocol version, and can automatically detect a server's version. Compatibility with anti-cheat systems is not guaranteed, and the project notes that ViaVersion may not work with modded registry entries or registry synchronization.
Written from Modrinth and the GitHub README . How we write it
In-game changes
Changes the game's code in 3 areas: Networking and multiplayerChanges 10 game code files in this area: connections, the server list and what is sent between your game and a server., User interfaceChanges 5 game code files in this area: menus, screens, tooltips, the chat window and the in-game overlay. and Server and world logicChanges 2 game code files in this area: the world, commands, scoreboards, saved data and game rules..
A library packed inside it changes 3 more game code files: Tinfoiled Cotton Client Commands.
Adds no new blocks, items or other content.
Keeps all of vanilla Minecraft's textures, models and sounds.
Often used with it
See all 30Details
- Creators
- ViaVersion (florianreuth and creeper123123321)
- License
- GNU General Public License v3.0 only
- Downloads
- 3.2M
- Created
- 22 Jun 2020
- 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
- Connects to the internet
- It has code that can go online, for example to check for updates, load skins or send crash reports. Found in ViaVersion, a library it includes. See Privacy
- Creates settings files
- The mod keeps its settings in the config folder of your game, where you can change or delete them. 2 files 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
- 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.28 latest files: the newest file for each Minecraft version and loader. The answer above is about the 11 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
Sends unknown data
Sent to dump.viaversion.com.
We found this in its code, read without running it.
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
- 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 11 files, for recent Minecraft versions. See each file in Releases
- dump.viaversion.comTalks to the mod's own online service.Unknown data
- update.viaversion.comChecks for a new version of the mod.Nothing about you
- Address built while the game runsThe code builds this address while the game runs: it is not written in the file.Purpose not known.Nothing about you
- 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
- 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 found38 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 found21 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 file3,083 code files read
Compatibility
See all 517 filesPoint at or tap a version to see its loaders.
Known conflicts
These projects do not work together with ViaFabric: their authors or ViaFabric's author say so. If you install both, the game can crash or some features can stop working. Some of them do the same job as ViaFabric, so you only need one.
Related projects
Projects that need ViaFabric to work.
Modpacks using this project
Find modpacks with it| Oct 2024 | 17 |
|---|---|
| Nov 2024 | 14 |
| Dec 2024 | 14 |
| Jan 2025 | 22 |
| Feb 2025 | 19 |
| Mar 2025 | 13 |
| Apr 2025 | 11 |
| May 2025 | 18 |
| Jun 2025 | 16 |
| Jul 2025 | 18 |
| Aug 2025 | 12 |
| Sep 2025 | 9 |
| Oct 2025 | 20 |
| Nov 2025 | 11 |
| Dec 2025 | 20 |
| Jan 2026 | 11 |
| Feb 2026 | 13 |
| Mar 2026 | 23 |
| Apr 2026 | 9 |
| May 2026 | 17 |
| Jun 2026 | 14 |
| Jul 2026 | 8 |
| Aug 2026 | 13 |
| Sep 2026 | 9 |
313 modpacks include ViaFabric in at least one of their versions. Here are the 30 most downloaded.
红石生电优化【Redstone Survival Optimization】1.3M downloadslast version with it 6 Feb 2026
Breakneck: Optimized751K downloadslast version with it 21 Apr 2025
Pixel Perfect515K downloadslast version with it 28 Mar 2026
XPlus PerioTable Modpack (Fabric)498K downloadslast version with it 6 Jul 2026
The Ultimate PvP Modpack (UPDATED!)161K downloadslast version with it 5 Sep 2026
PvP158K downloadslast version with it 13 Dec 2024
DB's Minecraft PLUS156K downloadslast version with it 9 Sep 2024
Crystal Client149K downloadslast version with it 12 Aug 2025
Gensokyo Reimagined QOL141K downloadslast version with it 17 Jan 2026
Feather | Lightweight Vanilla+ Modpack132K downloadslast version with it 26 Apr 2022Often in the same modpacks
Mods that modpacks often add together with ViaFabric. Share: how many of the modpacks with ViaFabric also have that mod.
LithiumAModin 95% of the modpacks with ViaFabric
Mod MenuAModin 93% of the modpacks with ViaFabric
FerriteCoreAModin 88% of the modpacks with ViaFabric
Sodium ExtraAModin 83% of the modpacks with ViaFabric
Reese's Sodium OptionsAModin 78% of the modpacks with ViaFabric
Dynamic FPSAModin 70% of the modpacks with ViaFabric
Zoomify (Zoom)AModin 62% of the modpacks with ViaFabric
No Chat ReportsAModin 62% of the modpacks with ViaFabric
KryptonAModin 61% of the modpacks with ViaFabric
BetterF3AModin 59% of the modpacks with ViaFabricLatest 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.