- Action
- Simulation
- Strategy
Game
X4: Foundations
X4: FOUNDATIONS, the long awaited sequel in the successful X series, brings our most sophisticated universe SIMULATION ever. Fly every ship, EXPLORE space or manage an empire; TRADE, FIGHT, BUILD and THINK carefully, while you embark on an epic journey.
Your journey to building a vast space empire begins behind the controls of a single ship. Explore, trade, fight, and build as you rise to command fleets, stations, and entire economies in a living, fully simulated universe that reacts to every decision.
About X4: Foundations
- Released
- November 2018
- Developer
- Egosoft
- Platforms
- Linux · PC (Microsoft Windows)
Release, studio and platform data from IGDB. Store links go to the sellers, not to us. We do not sell games and we do not host files.
Browse everything
Sorted, filterable and paged. Every link goes to the author’s own download.
- Mods3.0kA mod changes the game itself. It needs something to load it, it may need other mods first, and it only works on the versions its author built it for.
- Frameworks29A framework is modding infrastructure rather than content: an API, injector or utility that other mods run on top of, or that helps you install, patch or manage them.
- Libraries17A library provides shared code other mods depend on rather than any content of its own. It is required, not optional, whenever something else lists it as a dependency.
From the developers
Official announcements, newest first. Posted on Steam.
- Community AnnouncementsInterview with Matthias: 18 Years of XIn our latest episode of Inside Egosoft, Joey sits down with Matthias, one of Egosoft's longest-serving developers, to discuss almost two decades of working on the X Universe.Though his title could be described as “gameplay programmer,” Matthias' efforts reach far beyond that role. In this conversation, we discuss topics ranging from AI flight systems and X4's design philosophy to the evolution...
- Community AnnouncementsJoin us at ChinaJoy Express in Shanghai from July 31st to August 3rdX4: Foundations is joining the Triple-i Initiative offline events in Shanghai!TO ALL PLAYERS:We are pleased to announce that X4: Foundations, invited by the Triple-i Initiative, will offer offline trial play at two exhibitions in Shanghai this summer. This event is open to all players, and we welcome everyone to come and experience it in person.EXHIBITION INFORMATION:The first event is the Core...
- Community AnnouncementsX4: Foundations Player Feedback Survey 2026Greetings,Feedback from our players has always been a guiding light for our work on the X Universe. We are constantly discussing reviews, forum posts, and comments internally, and your feedback during our open betas is invaluable as we strive to make each update the best it can be.In an effort to better understand our players and align our priorities, we’ve created a survey to learn more about...
- Community AnnouncementsUpcoming Changes to X4: Foundations Minimum System RequirementsAs we continue to develop and expand X4: Foundations, we are constantly looking for ways to improve the game's proprietary engine and overall performance. To keep pushing the boundaries of what our engine can do, we are preparing to upgrade our graphics API to Vulkan 1.4 as part of a future update. Our plan is to do this as part of the next major update after 9.00. Because of this necessary tec...
- Community AnnouncementsX4: Foundations is on Today's Steam Daily DealsGreetings, We’re excited to announce that X4: Foundations is featured as a Steam Daily Deal today, making for a great opportunity for new players to dive into our living universe at a discounted price. This sale comes just days after we released our free 9.00 “Empire Update,” one of the largest free updates in X4: Foundations’ history. This update brings new features, sweeping balance improveme...
- Community AnnouncementsX4: Foundations 9.00 "Empire Update" is Out Now!We're very excited to announce that the X4: Foundations "Empire Update" (9.00) has officially launched! This free major update includes new features and sweeping reworks that improve how you interact with your empire: militarily, strategically, and economically. We'd like to extend our sincere thanks to the community for your invaluable feedback during the 9.00 Public Beta, which has helped us...
- Mods indexed
- 3.1k
- Versions
- 0
- Newest tracked
- none yet
- Most disruptive update
- No breakage data for this game
Most downloaded
Measured from the source's own counts, summed across every release.
- UI Extensions and HUD205.2k downloads
- X4 Star Wars Interworlds (SWI)197.4k downloads
- Mod Support APIs163.8k downloads
- Cheat MenuThis Mod is Made to make the game a lot faster to progress in, and help in some mundane tasks. Refer to change notes for changes The Activation methods are: Activates menu (CTRL + H) "Cockpit toggle" while piloting Activates quick menu (SHIFT + H) "HUD toggle"while not piloting Cheat Menu alterna...153.1k downloads
- Variety and Rebalance Overhaul VRO148.3k downloads
- Sector Satellites137.6k downloads
- SirNukes Mod Support APIsCollection of APIs for modding support. Components include: Lua Loader API, Time API, Named Pipes API, Hotkey API, Interact Menu API, Simple Menu API. This extension does nothing on its own, but other mods may depend on it. Note: the hotkey api requires an external python program which listens to...127.7k downloads
- Sector ExplorerSector Explorer This mod adds a new default job option for your pilots. Use a fast ship for this job. Pilots assigned to sector explorer duty will travel around the sector to visit unknown stations, gates, highways, then when all are discovered, they will fly an accurate 300-900km radius hexagon...126.0k downloads
- Learning All The Things120.7k downloads
- Better Kill CreditReceive kill credit rewards from owned ships you aren't piloting and receive rewards for contributing to large ship kills even if you don't get the final shot. Now you can make some decent cash by helping out a faction with a defense fleet. When you are not in the vicinity of the ship that was de...116.0k downloads
- Variety and Rebalance Overhaul5.0 released!! Compatible with X4 9.0 Mod requires all current DLCs, except Hyperion and Envoy DLC (but its supported) VRO Assets mod is no longer required VRO MOD REQUIRES A NEW GAME START (vanilla saves won't work) AND CANNOT BE SAFELY DEACTIVATED PLEASE USE DISCORD FOR СOMMUNICATION REGARDING...107.7k downloads
- Fly-by LootingThis mod scans for dropped loot around your currently piloted ship in 2-10km range defined by your ship size, and of course loot them. It's perfect during/after dogfights to gather stuff. Big containers are not picked up by this mod, only ammo and small inventory items - used for crafting. Check...105.1k downloads
- Faster Crew LevelingStatus for 7.60 and 8.0: still working What it is A very experimental and simple boost to level up rates for most crew skills. This mod aims to be a simple alternative to seminar mods and increased crew level mods. Skills should level up a LOT faster compared to vanilla, probably to the point of...95.2k downloads
- CrystalFinder94.2k downloads
- KUDA AI tweaks83.6k downloads
- Faction Enhancer - Econ AI ModuleThe Faction War/Economy Enhancer is a collection of (currently 4) extensions that significantly improve faction war and economy behavior, making the universe generally proceed at a faster and more interesting pace. The goal is to improve and expand vanilla behavior, not redesign the game, so in c...76.9k downloads
- X4 Fire and SmokeCompatible to all versions of X4 and all DLCs. Savegame compatible. This mod is also compatible to other mods as long as they dont change explosions (I think there exists no other mod that does this right now in 2020 so every mod works). This mod introduces XRebirth style explosions and burning m...74.0k downloads
- Friendly fire tweaks73.6k downloads
- Faction Enhancer - War ModuleThe Faction War/Economy Enhancer is a collection of (currently 4) extensions that significantly improve faction war and economy behavior, making the universe generally proceed at a faster and more interesting pace. The goal is to improve and expand vanilla behavior, not redesign the game, so in c...71.9k downloads
- X4 CHEAT MENU71.8k downloads
- Crystal RaritiesDescription: I love mining crystals. I enjoy hunting through asteroid fields and eventually stumbling on that big payday. But in vanilla, crystals' little blinking lights are a pain to spot for my old-man eyes. Then with the introduction of a "cooldown" on crystals spawning in 3.0, crystal mining...70.7k downloads
- [8.X] - Ship Variation ExpansionNOTICE: Maintenance for this mod has been taken over by EagleDelta, you can find the new version of this mod here. I have made the decision to no longer support this mod for future versions of X4 due do constant breaking changes with major updates. If you want to continue using this mod make sure...65.9k downloads
- Improved Repair Laser63.2k downloads
- Faction Enhancer - Econ Balance ModuleThe Faction War/Economy Enhancer is a collection of (currently 4) extensions that significantly improve faction war and economy behavior, making the universe generally proceed at a faster and more interesting pace. The goal is to improve and expand vanilla behavior, not redesign the game, so in c...62.8k downloads
Browse all 3.0k X4: Foundations mods Sortable by downloads, rating and date.
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Why X4: Foundations mods break
A mod is compiled against one version of a game. When the game updates, anything that reached into the parts that moved stops working, and it usually stops working silently rather than with a message that explains itself.
That is what the table above counts. It is not a guess: each row is a mod the community has reported as broken by that specific release. The number is a fair measure of how disruptive an update was, and it is the reason people delay updating a game they have modded heavily.
Common questions
Does IndexGG host X4: Foundations mods?
No, and it never will. Every download link points at the author's own page on Nexus, GitHub, CurseForge or wherever they published it. We index the ecosystem; the files stay with the people who made them.
Where does the compatibility data come from?
From the communities that maintain it in the open, not from guesswork. Each claim carries how it is known, so a reported breakage is never presented as though the author said it.
Why is a mod listed as broken when it works for me?
Compatibility depends on your exact game version and the rest of your load order. A mod marked as broken in one release may work fine on an older one, which is exactly why the version is recorded next to the claim rather than a bare yes or no.