Mod Observer
ModServer checks which mods players have before letting them join.
Why gradeC
How grades workStrengths
Points lost
- No release in 10 months−15 points
- Under 5 million downloads−2 points
- Releases in only 7 of the last 24 months−1 point
- Releases replaced within 3 days to fix a problem−1 point
All 11 criteria
Maintenance
10 points lost17 / 27Last releaseHow long ago the newest file came out, or an existing file was marked as working on a new Minecraft version.10 months ago (22 Dec 2025) 3 / 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.1.21.11 on Fabric. 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 / 9Regular releasesIn how many of the last 24 months a new file came out. Full points at 8 months.Releases in 7 of the last 24 months 5 / 6Stability
1 point lost21 / 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.2 of the 4 modpacks with two or more versions removed it in a later one (50%) 10 / 10Quick fixesHow often a release needed a quick fix: a new release within 3 days to fix a problem in it.2 of its 15 releases in 2 years needed a quick fix (13%) See the 2 releases6 / 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 5 / 5Transparency
Full points10 / 10Source codeWhether the project page links to its source code, so anyone can read what it does.GitHub · Sn0wix/Mod-Observer 7 / 7Place to report problemsWhether the project page links to a place where players can report problems: an issue tracker.GitHub issues · Sn0wix/Mod-Observer 3 / 3Popularity
2 points lost2 / 4DownloadsDownloads on Modrinth and CurseForge. Full points from 5 million.23,325 2 / 4Track record
6 points lost2 / 8AgeHow long the project has existed. It counts less when no new file came out recently.2.5 years, 18 releases 2 / 8Security
PassedFile 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
52.3 of the 71 points that apply = 74 out of 100. The points above are rounded to whole numbers.
Images
About
Mod Observer helps server owners manage which mods players may use by having the client report its loaded mods when joining a server, where the server checks them against configured rules. The server can use allowlists, blocklists, and required-mod lists, with options to ignore selected players or make Mod Observer optional for some players. Checks can include SHA-256 file verification and nested mods, and players see a compatibility interface when their mods do not match the server’s requirements. A configuration generator helps administrators create mod lists from loaded mods, while commands support tasks such as viewing a player's mods, changing the filtering mode, and reloading configuration.
Written from Modrinth . How we write it
In-game changes
Changes the game's code in 2 areas: Networking and multiplayerChanges 1 game code file in this area: connections, the server list and what is sent between your game and a server. and User interfaceChanges 1 game code file in this area: menus, screens, tooltips, the chat window and the in-game overlay..
Adds no new blocks, items or other content.
Keeps all of vanilla Minecraft's textures, models and sounds.
Details
- Creator
- Sn0wix
- License
- MIT License
- Downloads
- 23K
- Created
- 4 May 2024
- 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.
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.6 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
- 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 so far that AI was used to make it
We looked for AI tools in its description, files and images and found none.
We have not read its changelogs and code history yet.
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.Not read yet
- 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 in the descriptionChangelogs not read yet
- 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 found1 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 file22 code files read
Compatibility
See all 18 filesPoint at or tap a version to see its loaders.
Modpacks using this project
Modpacks that include Mod Observer in at least one of their versions, most downloaded first.
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.
18 releases
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 1 point.
See them, newest first
Quick fixesReleases followed within 3 days by a new release that fixes a problem in them.2
- ModObserver-fabric-2.0.3+mc1.21.xFixed: - Xaero's minimap crash
- ModObserver-fabric-2.0.1+mc1.21.xFixed: - frozenlib crash