1
Squirrel's Pick Squirrel's PickThe best game on this page. If you only try one, try this.
Space SimEconomySpace
$49.99 ~167.4 hr median no co-op complexity: heavy 79.9% of 29k
The Squirrel's verdictX4: Foundations expands on X Rebirth's walk-around ship interiors across a full range of flyable vessels, adds pilot-assignable fleet management, and carries strong mod support. The seamless single-universe trading, station construction, and economic simulation are all present. Reviews consistently flag thin endgame goals once financial freedom is achieved and tutorials that don't connect directly to live gameplay, so the entry barrier remains comparable to Rebirth.
Not for you if you need tutorial missions integrated into actual play sessions rather than standalone instructional chapters, or want a structured story campaign as the primary progression.
2
AliensSci-fi4X
Strong Mods Strong ModsA deep, active modding scene extends it past its base content.
$29.99 ~111.8 hr median co-op complexity: moderate 76.7% of 10k
The Squirrel's verdictBoth build space empires around economy, ship design, and station/fleet management across sprawling galaxies. X Rebirth puts you inside a cockpit flying and docking manually in real time. Galactic Civilizations III is turn-based, viewed from a galaxy map, with diplomacy and tech trees driving the same empire-building itch without any direct piloting.
Not for you if you want to fly ships yourself in real time rather than manage an empire from a turn-based galaxy map.
3
SpaceSci-fiSpace Sim
$15.99 ~83 hr median no co-op complexity: heavy 85.4% of 3k
The Squirrel's verdictX3: Terran Conflict covers the broadest range of ships and mission types in the pre-Rebirth series: traders, miners, military vessels, and pirates are all directly flyable, and a large modding community has extended the content well beyond the base game. The menu-driven cockpit and map system manages sector traders and production chains without walk-around sections. Median playtime is 83 hours, and reviews describe the grind-heavy opening as the main barrier before the empire-building loop takes hold.
Not for you if you want the modular station design and drone mechanics X Rebirth introduced, or need the game to explain itself before rewarding the time investment.
4
Closest Match Closest MatchThe most similar game to the anchor, by what players say. Budget Pick Budget PickThe best game here for the least money.
SpaceSci-fiEconomy
$4.99 ~29.5 hr median no co-op complexity: heavy 83% of 524
The Squirrel's verdictPlayers who want to fly every ship in the fleet directly — freighters, fighters, capital ships — rather than commanding from a single avatar will find X2: The Threat's direct-control model a closer fit for that preference. The universe is smaller and more self-contained than later entries, with the same sector-economy foundation: factories producing and consuming goods, jump-gate travel, and trading leading into fleet-building. Reviews note the opening hours demand patience before the economic depth opens up.
Not for you if you want modular station design, drone systems, or the crew and walk-around ship interiors added in later X titles.
5
Space SimSpaceAction
Free ~15.1 hr median no co-op complexity: heavy 79.2% of 337
The Squirrel's verdictSame core loop as X Rebirth: build trade fleets, run production chains, watch an economy of interconnected supply react to your actions. Helium Rain trades X's sprawling universe and station-building for Newtonian ship physics and a tighter, more compact economic sandbox. Median playtime runs around 15 hours, so the universe is deliberately contained rather than open-ended.
Not for you if you came to X Rebirth for a vast, story-driven universe with extensive freeplay — Helium Rain's economy and session length are both considerably smaller in scale.
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SpaceSci-fiBase-Building
$19.99 ~29.2 hr median no co-op complexity: moderate 75.4% of 2k
The Squirrel's verdictBoth put you in modular ship design and building up an operation from scratch, but The Last Starship trades X Rebirth's galaxy-scale trading and story for a tighter ship-builder-and-survival loop with no multiplayer. Reviews describe thin endgame content and missing verticality post-1.0, closer to a construction sandbox than a living universe.
Not for you if you want the sprawling story, factions, and trading depth of X Rebirth rather than a smaller-scope ship-building sandbox with a reportedly thin endgame.
7
X: Beyond the Frontier
PC
SpaceSci-fiSpace Sim
$4.99 ~18.7 hr median no co-op complexity: moderate 75.2% of 395
The Squirrel's verdictThis is the 1999 original that started the series X Rebirth belongs to: trading, station building, and sector economies without Rebirth's single-avatar walk-around structure or its conversation minigame. Ships are swapped directly instead of managed through one protagonist, controls are dated, and the tutorial is thin, but the trading and production loops are the same lineage.
Not for you if you need modern controls, ship crews, or an eased-in tutorial rather than a slow, dated 1999 interface.
8
SpaceSpace SimSci-fi
$9.99 ~14.2 hr median no co-op complexity: heavy 71.9% of 734
The Squirrel's verdictSame X universe of trading, building, and fleet management, but before the Rebirth redesign: multiple flyable ship classes instead of one avatar ship, menu-driven station and trade management instead of the conversation minigame, and no walk-around inventory system. Reviews call the interface confusing and the learning curve steep. For players who want the economic depth without the Rebirth-era UI experiments.
Not for you if you want to walk around ships and stations rather than manage everything through menus and interface screens.