Games like Post-Apo Builder
Games like Post-Apo Builder include Prison Architect, Manor Lords, Infection Free Zone, Against the Storm, and Frostpunk. We matched them by the tags players give Post-Apo Builder on Steam (Post-apocalyptic, Strategy, Base Building, Building, and Sandbox): closest matches first, and among equally close ones the better-known games.

Prison Architect
Shared: Building · Base Building · Sandbox

Manor Lords
Shared: Strategy · Base Building · Building

Infection Free Zone
Shared: Post-apocalyptic · Base Building · Strategy

Against the Storm
Shared: Strategy · Base Building · Building

Frostpunk
Shared: Strategy · Post-apocalyptic · Building

Workers & Resources: Soviet Republic
Shared: Strategy · Base Building · Building

Cities: Skylines
Shared: Building · Strategy · Sandbox

Factorio
Shared: Base Building · Strategy · Sandbox

Empires of the Undergrowth
Shared: Strategy · Base Building · Building

Kingdoms and Castles
Shared: Strategy · Sandbox · Building

Kenshi
Shared: Sandbox · Post-apocalyptic · Base Building

They Are Billions
Shared: Base Building · Strategy · RTS

Endzone - A World Apart
Shared: Strategy · Post-apocalyptic · Base Building

Stronghold: Definitive Edition
Shared: Strategy · Building · Sandbox

Dwarf Fortress
Shared: Base Building · Strategy · Sandbox

Cities: Skylines II
Shared: Building · Sandbox · Strategy

Songs of Syx
Shared: Strategy · Sandbox · Base Building

Dyson Sphere Program
Shared: Base Building · Building · Sandbox

RimWorld
Shared: Base Building · Strategy · Sandbox

Norland
Shared: Strategy · Base Building · Building

Stronghold Crusader: Definitive Edition
Shared: Strategy · Building · Sandbox

Foundation
Shared: Strategy · Sandbox · Building

Stronghold Crusader HD (2012)
Shared: Building · Base Building · Strategy

Timberborn
Shared: Sandbox · Building · Base Building

