Mapgen4

Web · Self-hosted

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Freedom report

One barScore 5.4

Free tierNo free tier on record
Open codeNo open-source code on record
Runs widely1 of 6 device platforms
DocumentedPlans, terms and facts published

Mapgen4 is ranked #10 of 27 in game map generators on Freedom251. It runs on Self-hosted, Web.

Compared on game map generators

Free plan: Yes
Generation method: procedural
Map dimension: both
Seed control: Yes
Export formats: PNG

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The record

Purpose: Mapgen4 is a procedural wilderness map generator where users paint mountains, valleys, and oceans and the simulation generates biomes and rivers.
Terrain style: It aims for a hand-drawn-inspired look, rendering terrain in 3D with a custom projection and outline.
Controls: Users can adjust simulation and style sliders, including rainfall and river-flow settings.
Export and usage: The page offers a high-resolution image download and says users may do as they please with maps they create; credit is appreciated but not required.
Project status: The maker describes the project as finished and mostly inactive, with code changes made in April 2023.
Download and local use: The repository provides the source code and instructions to build it with npm or pnpm and run it locally in a browser.
Code license: Mapgen4 and its helper libraries are licensed under Apache v2, and the maker says they can be used in commercial projects.
Limits: The maker says rendering parameters are designed to look best around 25,000 Voronoi cells, although the underlying code can support more than one million.
Unbuilt features: The maker lists drawing rivers, sphere output, resources, towns, forests, names, roads, and nations as features that could be added in a future project.
Support: The Mapgen4 page provides the maker’s email address and invites interested people to email about extending the project.
Audience: Red Blob Games says its main audience is independent, student, and hobbyist software developers.
Security and compliance: The opened Mapgen4 page and repository do not state any security or compliance certifications.
Terrain editing: You choose a starting seed and paint mountains, valleys, and oceans on the map.
Simulation: The generator simulates evaporation, wind, and rainfall to determine biomes and rivers.

Where it ranks on Freedom251

Best Game Map Generators in 2026#10 of 27

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Sources

redblobgames.com/maps/mapgen4/· checked 2 Oct 2026
github.com/redblobgames/mapgen4· checked 2 Oct 2026
redblobgames.com· checked 2 Oct 2026