Steam — Active 100% Free Windows PC Only

Build Your Base. Hunt the Monsters. Survive Once Human.

Explore a post-apocalyptic open world corrupted by Stardust. Scavenge resources, craft 100+ weapons, build and defend your territory, and fight terrifying aberrations — solo or with a squad. Free on Steam for Windows PC.

Before you click — quick check
  • Windows 10 or 11 required — not Mac, not mobile
  • Up to 90 GB free disk space — SSD strongly recommended
  • Available regions: US · UK · CA · AU · DE · FR · NL · AT · NO · CH · NZ
Install Free on Steam
No purchase No credit card No paywall to start 90 GB required Windows 10/11 only

By installing you agree to our Terms of Use and Privacy Policy. This is an independent affiliate page.

231k+ Peak Players
166k+ Steam Reviews
792k+ Discord Members
How to Start

Your Survival
Starts Here.

Three steps. No separate launcher. No account needed to download.

1

Click "Install Free on Steam"

If Steam is already on your PC, it opens immediately and queues the download. If not, you'll be taken to the Steam store page — installing Steam takes about 2 minutes.

2

Download & Install the Game

Large install — plan for up to 90 GB free space. SSD strongly recommended for load speed and stability. Steam lets you pause and resume at any point.

✓

Launch → Create Your Character

Hit Play in Steam. Create your character and the world opens. No paywall. No tutorial gate. Your survival starts the moment you step in.

Install Free on Steam

System Requirements

🖥️
Operating System
Windows 10 / 11
No Mac. No Linux. No mobile.
💾
Free Disk Space
Up to 90 GB
SSD recommended — HDD causes slow loads
🎮
Platform
Steam (Free to Play)
No separate launcher required
🌐
Connection
Always Online
No VPN · No data-center ISP · Real IP only

Most Common Install Failure

If your install fails silently or crashes mid-way: check that you actually have 90 GB free — not 55 GB. The official FAQ mentions 55 GB but Steam's system requirements list 90 GB. Disk space is the #1 silent failure cause.

Explore the World

A Fallen World
Waiting to be Claimed.

Once Human — post-apocalyptic horror atmosphere, soldier vs monster
Post-Apocalyptic Open World
Once Human — open world gliding with giant creatures
A Brave New World Awaits
Once Human — third-person combat and gunfire
Combat & Survival
Once Human — base building and magical creatures
Journey with Magical Creatures
Why Once Human

Explore. Craft.
Conquer.

Unleash your survival skills and build your own world of adventure.

🧟
Survival That Punishes Complacency

Manage hunger, water, and sanity under Stardust contamination. Every zone feels eerie and alive. The world decays — and so do you — if you stop moving.

Open World
🔫
100+ Gun Blueprints to Hunt Down

Collect, craft, and mod over 100 gun blueprints. Tune with accessories and perks for specific builds. The loot loop is built around gear progression — not grinding levels.

Weapons & Loot
🏗️
Base Building With a Real System

Build and hold your Territory Core. Design, expand, and relocate your base. Other players can see it. Make it count.

Territory System
👥
Survive Together or Alone

Full solo progression or co-op squad play. PvE and PvP server types both available. Choose your world at character creation — griefers are optional.

Co-op & PvP
Real Numbers

The Community
Is Already There.

No inflated claims. Every number is sourced from a named public source.

231k+
All-Time Peak Concurrent Players
SteamDB
166k+
Steam Reviews (Total)
Steam Store
792k+
Official Discord Members
Discord Server
★★★★★

"The base building system is genuinely deep. One of the best survival games I've played in years — and it's completely free."

Steam Community Forum
★★★★☆

"The Stardust contamination mechanic changes how you think about exploring. It's not just another open-world survival clone."

Steam Review
★★★★★

"Played with two friends on day one — had a base started within the hour. Great co-op from the very first session."

Steam Community Forum
Quick Answers

Still Have
Questions?

Yes — Steam lists Once Human as Free to Play. No purchase, no subscription. You can download, install, and play without spending anything. Optional cosmetic purchases exist in-game but nothing is required to progress.
The game's FAQ mentions 55 GB, but the Steam system requirements page lists 90 GB available space. We use the Steam figure because it covers patches and swap files. Installing with less than 90 GB free risks a silent failure mid-download.
Both. Full solo progression is supported — the game does not force you into a team. You choose your server type (solo, co-op, or PvP) at character creation.
PvE and PvP server modes both exist. On PvE servers, player raiding is restricted. PvP server types have open conflict. You pick your preference at character creation — it's not forced on you.
This page covers the Steam PC version on Windows only — where the full feature set (base building, weapons system, open world) runs at maximum depth and fidelity. The install flow on this page routes directly to Steam.
Check three things first: (1) 90 GB of free disk space — not 55 GB. (2) Game installed on SSD if possible. (3) GPU drivers are up to date. For persistent issues, the official Once Human Discord has active support channels with 792k+ members.
Most players are genuinely engaged within the first session. Playing with a friend, expect 30–60 minutes before you have a basic base running and real fights underway. The first-hour experience is built around action, not tutorials.
The official Discord and Steam page are the primary sources for patch notes and events. Twitch Drops campaigns run regularly — link your account to earn in-game rewards from watching streams.
One Last Thing

It's Free.
You Have Nothing to Lose.

Post-apocalyptic survival MMO on Steam. Windows PC. Up to 90 GB. Create your character — the world opens immediately.

Install Free on Steam Steam Store Page →

Windows 10/11 only  ·  Up to 90 GB  ·  No purchase required