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SPECIFICTION
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Worldsmith

github.com

Free plan Web
Visit github.com
Spec score 7.2 #22 of 27 in Game Map Generators

What it is

Worldsmith is a free, open-source browser application for generating fantasy world maps from a numeric seed, with a mode for rendering real Earth. Procedural terrain uses domain-warped fractal noise, including ridged mountain ranges, while biomes derive from elevation, moisture, and temperature. Rivers use D8 flow accumulation to form tributary drainage networks. Exports include PNG maps up to 5120 pixels, editable SVG maps up to 3840 pixels, JSON world data, and 8-bit or 16-bit heightmaps. The maker says heightmaps can be imported into Unity, Unreal Engine, Blender, and World Machine. Earth mode uses NOAA ETOPO1 elevation and bathymetry, averaged to about five kilometers per sample; synthesized detail is disclosed and can be disabled with Detail set to 0. The app runs entirely client-side without an account, server, or dependencies, and is offered under the MIT license.

Spec sheet

Purpose
Worldsmith generates infinite fantasy world maps in a browser from a numeric seed and can also render real Earth.Read 8 Oct 2026 · thedatawiz-dot.github.io
Integrations
The maker says heightmaps are suitable for import into Unity, Unreal Engine, Blender and World Machine.Read 8 Oct 2026 · thedatawiz-dot.github.io
Founded
2026Read 28 Sep 2026 · github.com
Accessibility limitation
The maker says the rendered canvas cannot be made readable by assistive technology, though controls are keyboard-operable and labelled.Read 8 Oct 2026 · github.com
Browser verification
The maker says the project is verified on Chromium, while Firefox and Safari are untested.Read 8 Oct 2026 · github.com
Client-side operation
The maker says the app runs entirely client-side with no account, server or dependencies.Read 8 Oct 2026 · thedatawiz-dot.github.io
Climate limitation
The maker says its climate model does not account for monsoons, ocean currents or mountain-specific orographic rain shadows.Read 8 Oct 2026 · github.com
Data disclosure
The maker says synthesized terrain detail in Earth mode is disclosed in the interface and can be disabled by setting Detail to 0.Read 8 Oct 2026 · github.com
Earth data
Earth mode uses NOAA ETOPO1 elevation and bathymetry, box-averaged to about 5 km per sample.Read 8 Oct 2026 · github.com
Exports
It exports PNG maps up to 5120 px, editable SVG maps up to 3840 px, JSON world data, and 8-bit or 16-bit heightmaps.Read 8 Oct 2026 · github.com
Hydrology limitation
The maker says drainage is solved on the visible grid, so rivers may not remain globally consistent when panning.Read 8 Oct 2026 · github.com
Limits
The maker says the Earth heightmap is about 27 MB and decodes to a roughly 67 MB resident grid, which may challenge older phones.Read 8 Oct 2026 · github.com
Rivers
Rivers are computed using D8 flow accumulation so tributaries merge into drainage networks.Read 8 Oct 2026 · thedatawiz-dot.github.io
Security and network behavior
The maker says shipped files have no runtime dependencies or network primitives, and its smoke tests check that the page makes no external requests.Read 8 Oct 2026 · github.com
Terrain and climate
Generated terrain uses domain-warped fractal noise with ridged mountain ranges, and biomes are derived from elevation, moisture and temperature.Read 8 Oct 2026 · thedatawiz-dot.github.io

Plans and prices

Free Free Free and open source under MIT license · no account, server or dependencies Read 8 Oct 2026 · thedatawiz-dot.github.io

Every Worldsmith plan and price →

Strong points and limits

Strong points

  • Seed control makes generation repeatable
  • Exports PNG, SVG, JSON, and heightmaps
  • Supports Unity, Unreal, and Blender imports
  • Runs client-side without accounts or servers
  • Free and open source under MIT

Limits

  • Climate model omits monsoons and ocean currents
  • Drainage may vary when panning
  • Rendered canvas is not assistive-technology readable
  • Firefox and Safari are untested

Who it suits

It suits map makers and 3D or game workflows needing seeded procedural worlds and exportable map data. Browser users who want client-side operation may also find it appropriate.

Verdict

Worldsmith offers seeded procedural map generation, Earth rendering, and several production-oriented export formats at no cost. Its documented climate, drainage, accessibility, and browser limitations matter for specialized projects.

Where Specifiction places it

Alternatives to WorldsmithAll alternatives →