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Worldsmith
What it is
Worldsmith is a free, open-source browser application that generates fantasy world maps from a numeric seed and can also render real Earth. Procedural terrain uses domain-warped fractal noise with ridged mountain ranges. Biomes derive from elevation, moisture, and temperature, while rivers use D8 flow accumulation so tributaries form drainage networks. Exports include PNG maps up to 5120 px, editable SVG maps up to 3840 px, 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 5 km per sample. The interface discloses synthesized detail in Earth mode, and setting Detail to 0 disables it. Worldsmith runs entirely client-side without an account, server, or dependencies. Its MIT-licensed project is listed as founded in 2026. The climate model does not include monsoons, ocean currents, or mountain-specific rain shadows. Drainage is solved on the visible grid, so rivers may not remain globally consistent while panning. The rendered canvas is not readable by assistive technology, although controls are keyboard-operable and labelled.
For and against
For
- Free and open source under MIT license
- Seed control for repeatable generation
- Exports PNG, SVG, JSON, and heightmaps
- Runs client-side without an account
- Heightmaps support several creative tools
Against
- Rendered canvas lacks assistive-technology readability
- Firefox and Safari are untested
- Earth mode may challenge older phones
- Climate model omits several weather factors
The verdict
Worldsmith offers procedural map generation, Earth rendering, and multiple export formats without requiring an account or server. Consider its browser verification and modeling limitations when choosing it for a project.
Who it suits
Worldsmith suits people creating procedural fantasy maps or Earth visualizations in a browser. It is also relevant to developers and artists needing exports for Unity, Unreal, Blender, World Machine, or image and data workflows.
Plans and prices
Free
Free and open source under MIT license · no account, server or dependencies
Read 8 Oct 2026 · thedatawiz-dot.github.io
On the record
- Accessibility limitation
- The maker says the rendered canvas cannot be made readable by assistive technology, though controls are keyboard-operable and labelled.github.com · read 8 Oct 2026
- Browser verification
- The maker says the project is verified on Chromium, while Firefox and Safari are untested.github.com · read 8 Oct 2026
- Client-side operation
- The maker says the app runs entirely client-side with no account, server or dependencies.thedatawiz-dot.github.io · read 8 Oct 2026
- Climate limitation
- The maker says its climate model does not account for monsoons, ocean currents or mountain-specific orographic rain shadows.github.com · read 8 Oct 2026
- 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.github.com · read 8 Oct 2026
- Earth data
- Earth mode uses NOAA ETOPO1 elevation and bathymetry, box-averaged to about 5 km per sample.github.com · read 8 Oct 2026
- 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.github.com · read 8 Oct 2026
- Hydrology limitation
- The maker says drainage is solved on the visible grid, so rivers may not remain globally consistent when panning.github.com · read 8 Oct 2026
- Integrations
- The maker says heightmaps are suitable for import into Unity, Unreal Engine, Blender and World Machine.thedatawiz-dot.github.io · read 8 Oct 2026
- 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.github.com · read 8 Oct 2026
- Purpose
- Worldsmith generates infinite fantasy world maps in a browser from a numeric seed and can also render real Earth.thedatawiz-dot.github.io · read 8 Oct 2026
- Rivers
- Rivers are computed using D8 flow accumulation so tributaries merge into drainage networks.thedatawiz-dot.github.io · read 8 Oct 2026
- 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.github.com · read 8 Oct 2026
- Terrain and climate
- Generated terrain uses domain-warped fractal noise with ridged mountain ranges, and biomes are derived from elevation, moisture and temperature.thedatawiz-dot.github.io · read 8 Oct 2026
