Free games like Sirius
Below are 8 free-to-play Steam games similar to Sirius, ranked by player overlap and content similarity. No purchase or Steam login required to view the list. Every pick is a full free-to-play title — not a demo, trial, or time-limited giveaway. imho.run's catalogue refreshes daily, so newly free or newly popular titles surface here without manual editing.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Sirius page.
Ranked picks
- 1
The Lab
Free-to-play alternative to Sirius — no purchase or trial window.
Welcome to The Lab, a compilation of Valve’s room-scale VR experiments set in a pocket universe within Aperture Science. Fix a robot, defend a castle, adopt a mechanical dog, and more. Still not sold? It’s free!
- 2
Control, I'm Not Coming Back
Free-to-play alternative to Sirius — no purchase or trial window. Shares Indie and Adventure with Sirius.
Control, I'm Not Coming Back is a short and emotional narrative game about a lost astronaut searching for a reason to keep going forward while facing the emptiness of space. Inspired by the Hopecore aesthetic, it’s a story about positivism, friendship and our human connection with Voyager 1.
- 3
The Riftbreaker: Prologue
Free-to-play alternative to Sirius — no purchase or trial window. Shares Action and Indie with Sirius.
The Riftbreaker: Prologue allows you to experience the events taking place before the story campaign of the main game. Explore an entirely new world. Gather resources. Build up a base. Defend yourself from thousands of alien creatures.
- 4
The Last Sovereign
Free-to-play alternative to Sirius — no purchase or trial window. Shares Indie and Adventure with Sirius.
Explore a world torn between armies of lust and purity in which everything is more complex than it seems, deciding the fate of nations through might, politics, and finance. Every decision matters in an intricate saga that tracks thousands of variables.
- 5
Warframe
Free-to-play alternative to Sirius — no purchase or trial window. Shares Action with Sirius.
Awaken as an unstoppable warrior and battle alongside your friends in this story-driven free-to-play online action game
- 6
Unturned
Free-to-play alternative to Sirius — no purchase or trial window. Shares Action and Indie with Sirius.
You're a survivor in the zombie infested ruins of society, and must work with your friends and forge alliances to remain among the living.
- 7
SCP: Secret Laboratory
Free-to-play alternative to Sirius — no purchase or trial window. Shares Action and Indie with Sirius.
Deep within a secure underground facility, a sudden containment breach allows many of the secured anomalies to escape from their chambers. Assist the Foundation in re-securing the facility, help the Insurgency in their goal to capture it, or wreak havoc as an SCP in a frantic bid to escape.
- 8
Aimlabs
Free-to-play alternative to Sirius — no purchase or trial window. Shares Action and Indie with Sirius.
Aimlabs is the aim trainer of choice for over 45 Million players, from beginners to esports pros. Our unique aim analysis optimizes your gameplay, targets your weaknesses & builds key skills for any FPS game! Time to warm up with our unlimited scenarios & rank up in-game!