Single-player games like Interstellaria
Below are 12 single-player Steam games similar to Interstellaria, ranked by player overlap. Every pick carries Steam's Single-player category, so multiplayer-only titles or always-online games don't sneak in. imho.run pulls the category data from Steam directly — Single-player here matches what the store labels.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Interstellaria page.
Ranked picks
- 1
Rebel Galaxy
Single-player alternative to Interstellaria — playable solo, no multiplayer required. Shares Indie and Adventure with Interstellaria.
Rebel Galaxy is a swashbuckling space adventure, with action-packed combat, exploration, discovery, trade, and “negotiation” with the outlandish denizens at the edge of the known universe.
- 2
Commander: Conquest of the Americas
Single-player alternative to Interstellaria — playable solo, no multiplayer required. Shares Strategy with Interstellaria.
Set sail for the New World and shape the destiny of your empire. Lead one of seven European factions in this blend of colony management, exploration, and naval strategy. Build settlements, explore vast territories, and secure your legacy through diplomacy and tactical naval combat.
- 3
Evochron Mercenary
Single-player alternative to Interstellaria — playable solo, no multiplayer required. Shares Indie and Simulation with Interstellaria.
The life of an independent mercenary is rarely without excitement. Your spacecraft awaits and your adventure begins in the Sapphire star system.
- 4
X3: Terran Conflict
Single-player alternative to Interstellaria — playable solo, no multiplayer required. Shares Strategy and Simulation with Interstellaria.
It is the year 2938. The long wished-for encounter of the X Universe and the Earth holds both joy and sorrow for the people. Despite flourishing trade, the clash of the diverse races, cultures and life forms creates new tensions, mistrust and open conflict that need to be overcome!
- 5
Sins of a Solar Empire: Trinity®
Single-player alternative to Interstellaria — playable solo, no multiplayer required. Shares Strategy and Indie with Interstellaria.
In Sins of a Solar Empire: Trinity, you are the leader of a civilization embroiled in a galactic war, fighting for the survival of your entire race against relentless foes.
- 6
Void Destroyer 2
Single-player alternative to Interstellaria — playable solo, no multiplayer required. Shares Strategy and Indie with Interstellaria.
Start with nothing... End with everything! All you have is a basic ship, barely fit for combat, with it you'll start your journey and empire. A open world space sandbox, inspired by and expanding the classics.
- 7
Halcyon 6: Starbase Commander
Single-player alternative to Interstellaria — playable solo, no multiplayer required. Shares Strategy and Indie with Interstellaria.
Halcyon 6: Starbase Commander is a retro space strategy RPG with base building, deep tactical combat, crew management and emergent storytelling.
- 8
Terra Invicta
Single-player alternative to Interstellaria — playable solo, no multiplayer required. Shares Strategy and Simulation with Interstellaria.
An alien invasion has fractured humanity into seven ideological factions each with a unique vision for the future. Lead your chosen faction to take control of Earth’s nations, expand across the Solar System, and battle enemy fleets in tactical combat.
- 9
Starbound
Single-player alternative to Interstellaria — playable solo, no multiplayer required. Shares Indie and Adventure with Interstellaria.
You’ve fled your home, only to find yourself lost in space with a damaged ship. Your only option is to beam down to the planet below, repair your ship and set off to explore the universe...
- 10
Star Command Galaxies
Single-player alternative to Interstellaria — playable solo, no multiplayer required. Shares Strategy and Indie with Interstellaria.
Take command in the ultimate starship simulator: Star Command Galaxies. Become a Captain, recruit your crew, customize and upgrade your starship, battle alien vessels, teleport to away missions and repel boarding invaders in this real-time strategy simulation adventure from indie studio Warballoon.
- 11
Sun Dogs
Single-player alternative to Interstellaria — playable solo, no multiplayer required. Shares Indie and Adventure with Interstellaria.
Sun Dogs is about exploring our inner solar system, altering your body, and embracing death. In a distant future, humanity readily alters itself, adapting bodies to new environments. Skim along the Sun's corona, float above the surface of Venus, travel the dusty plains of Mars, and beyond.
- 12
Covid Simulator
Single-player alternative to Interstellaria — playable solo, no multiplayer required. Shares Indie and Simulation with Interstellaria.
COVID SIMULATOR is an outbreak simulation that visualizes how quickly Covid-19 spreads, becoming a disaster. The game is an open sandbox where you can add (or remove) Covid mandates and see what happens! Create your workplace, enact your mandates, and roll the dice with your workers.