Devast.io is described as '– a new post-apocalyptic io game in the genre of survival'. There are more than 10 alternatives to Devast.io, not only websites but also apps for a variety of platforms, including Windows, iPhone, iPad and Mac. The best alternative is Terraria. It's not free, so if you're looking for a free alternative, you could try Agar.io or Slither.io. Other great sites and apps similar to Devast.io are Don't Starve (Paid), Rust (Game) (Paid), DayZ (Paid) and Unturned (Freemium).
Play as Wilson, an intrepid Gentleman Scientist who has been trapped by a demon and transported to a mysterious wilderness world. Wilson must learn to exploit his environment and its inhabitants if he ever hopes to escape and find his way back home.
The post-soviet country of Chernarus is struck by an unknown virus, turning the majority population into frenzied infected. Fighting over resources has bred a hostile mentality among survivors, driving what’s left of humanity to collapse.
Unturned is a sandbox game in the emerging multiplayer apocalypse survival genre. Rather than focusing on being an MMO it provides players with easy systems to sit down and survive the zombie infestation with their friends.
In the year 2034 nuclear attacks have decimated the Earth and the remaining population is infected by an unknown virus. The infected die within 7 days and soon reanimate becoming blood-thirsty zombies. No one believed it; nobody expected it and nothing can stop it!