Nyxen

Terms and privacy

Last updated 27 September 2026 · applies to Nyxen 1.6.1

1. What Nyxen is

Nyxen is a Windows application that sits alongside games you already own. It finds and installs mods, reads your Minecraft launchers, tracks achievements, talks to RetroArch, and can connect you to friends running the same app.

It is free. There is nothing to buy inside it, no subscription and no advertising. It is made and maintained by one person as a personal project, not by a company.

It is not affiliated with Valve, Steam, Mojang, Microsoft, Modrinth, Thunderstore, GameBanana, Nexus Mods, CurseForge, Prism Launcher, JourneyMap, LRCLIB, Apple, RetroAchievements, libretro or any game publisher. Their names appear here and in the app only to say what it works with.

2. Using it

You may install and use Nyxen on computers you control, for as long as you like. You may not sell it, or pass off a modified copy as the original.

You must not use it to break into accounts that are not yours, to distribute malware, or to do anything unlawful. If you do, these terms stop applying to you and you are on your own.

3. Achievements and the unlocker

Nyxen can mark Steam achievements as unlocked on your own account, for games you own. That is what the feature is for, and the app will not operate on anyone else's account.

Be clear about what that means:

• Some games, and some platforms, consider this against their rules. Whether you are willing to accept that is your decision, not the app's.
• It can affect leaderboards, other players' perception of your profile, and in some cases your standing with a platform or game.
• It cannot be undone by Nyxen for every game — some games and services keep their own copy of what you have earned.

The app asks for confirmation before it changes anything, and it refuses cases it considers unsafe. Those checks exist to stop accidents, not to make the choice for you. The consequences are yours.

4. Mods and other people's files

Mods are made by other people and downloaded from their sites. Nyxen finds them and puts the files in the right folder; it does not host, review, scan or vouch for them.

• Each mod has its own author, licence and terms. Those apply, not these.
• A mod is code that runs inside your game. Install things you are willing to trust.
• Mods can break a game, a save file or a world. Back up anything you care about. Nyxen never deletes a mod to install another one, but it cannot make a broken combination work.

5. Other services

Some features talk to services run by other people. When you use those parts, their terms and privacy policies apply as well as these:

• Steam — for your library, achievements and the Workshop.
• Modrinth, Thunderstore, GameBanana — for mods, shaders and packs.
• Nexus Mods — to browse and search mods for thousands of games. Nexus files are downloaded on Nexus's own site, under its own terms; Nyxen only installs the file you saved.
• JourneyMap — the map mod the Minecraft live map adds to a pack when you turn it on. It runs inside your game; its web map listens on your own PC only.
• mc-heads.net — pictures of Minecraft players' heads on the live map.
• LRCLIB and Apple's iTunes Search — lyrics and cover art for the full-screen music player.
• YouTube and SoundCloud — room music plays from their own players, under their terms; nothing is downloaded or re-hosted.
• e4mc - the Minecraft mod that relays an opened LAN world to your friends when you play online. libretro - RetroArch's netplay lobby and relay, when you host a retro game online (your nickname and the game's name are listed there while you host, with a password).
• Epic Games Store, GamerPower and CheapShark — the free games and deals on Home. Claiming or buying happens on the store's own site, under its terms.
• Microsoft and Mojang — if you sign in for Minecraft skins. Nyxen never sees your password; sign-in happens on Microsoft's own page.
• RetroAchievements — for retro achievement data.
• libretro — for the retro databases, cheats and box art.
• pollinations.ai — answers Nyxen AI questions when you have no AI of your own set up. You can switch it off in Settings.
• Your AI provider — only if you set one up.

If one of them changes or goes away, the part of Nyxen that used it stops working. That is outside anyone's control here.

6. Your data

Nyxen is a desktop app, so almost everything stays on your machine:

• Your library, playtime, achievement history, statistics, notes, screenshots and settings are stored in your own user folder.
• None of it is sent anywhere unless a feature you used needs to — a mod download, a game lookup, an achievement check.
• There is no analytics, no telemetry and no crash reporting. Nobody is counting how many people installed this or what they did with it.
• Credentials you give it — an AI key, a Microsoft sign-in — are stored on your PC, encrypted with Windows' own protection tied to your account.
• Uninstalling leaves your data in place on purpose, so an update does not wipe it. Delete the folder yourself if you want it gone.

7. Friends, messages and the server

The social side needs a server, because two PCs have to meet somewhere. There are two ways that happens, and they are different in a way worth understanding:

• You run it yourself. The server is one file. Your accounts and messages live on your own machine and nobody else can read them.
• You join someone else's — including the one this site belongs to. Then what you post, send and set is stored on that server, and whoever runs it can technically read it.

So: do not treat messages as private or encrypted. They are not end-to-end encrypted. Treat them the way you would treat a message on any small forum.

Calls and screen sharing connect the two computers directly where they can. When they cannot, the connection may be relayed by a third party. Share your screen deliberately — it shows whatever is on it.

While you are signed in, the list of games on your PC — their names and Steam ids, nothing else — is shared with the server, so a friend can see which games you have in common. Your Games privacy setting decides who can see it, and it is removed with your account.

Your account comes with a recovery key, shown once. The server keeps only a fingerprint of it, the same way it keeps your password. Anyone holding your username and that key can set a new password, so keep it somewhere safe.

Nyxen Eclipse is an optional membership, for 1, 3, 6 or 12 months. The app itself does not take payments. When online checkout opens it is run by a payment provider, under their terms: a 7-day free trial needs a credit or debit card at checkout, nothing is charged during those 7 days, cancelling before they end costs nothing, and after that the membership renews at the price shown until you cancel. One free trial per account. Until checkout opens, a membership is given by whoever runs the server, directly or with a one-time code, and they can end it.

If you use a server someone else runs, they may remove accounts or content, and they are under no obligation to keep it running or to keep backups.

8. The assistant

The assistant works without any setup through Nyxen AI, which sends your question to pollinations.ai. If you run Ollama on your PC, or add a key of your own, that is used instead and pollinations.ai is not contacted. Nyxen AI can be switched off in Settings. When you use it:

• What you type, and any screenshot you explicitly ask it to look at, is sent to the provider you chose. Their terms apply to that.
• It only reads the screen when you ask. It does not watch in the background.
• It can be wrong. Advice about a game, a build or a setting is a suggestion, not a fact. Do not follow it into anything destructive without checking.

9. No warranty

Nyxen is provided as is, with no warranty of any kind, express or implied — including fitness for a particular purpose and non-infringement.

To the fullest extent the law allows, the author is not liable for any damage, data loss, lost saves, broken game installs, account penalties or anything else arising from using this software. You install and run it at your own risk.

Nothing here tries to remove rights you have under the consumer law where you live, because it cannot.

10. Changes and ending

These terms can change when the app changes. The date at the top says when they last did. Continuing to use the app after a change means you accept it; if you do not, uninstall it.

The app may stop being updated at any point. It is a personal project, and nobody is promising a roadmap, a support window or an uptime figure for any server.

You can stop at any time: uninstall it from Add / Remove Programs.

11. Contact

Nyxen is made by Antonio. For a problem with the app, a bug, or a request to remove something from a server run by this site, get in touch through whichever channel you were given the app.

There is no support desk and no guaranteed reply. That is the honest position for a free project made by one person.