A free CadMapper alternative for site plans

How this comparison was made

Reviewed 27 October 2026. Atlasly publishes this page. CadMapper's details come from its own home page on that date; we did not run a timed or accuracy test of either service. Atlasly's details come from the current export tool. If a feature matters to your project, try both on the same site.

CadMapper home page

Atlasly data sources, coverage and limits

What CadMapper offers

• Free files up to 1 km² after you sign up, and free whole-city road files (2D DXF) without an account.
• Larger areas up to 100 km² "for a small fee"; the price is shown when you order, not on the home page.
• Files for AutoCAD, SketchUp 8+, Rhinoceros 5+ and Adobe Illustrator.
• Data from public sources such as OpenStreetMap, NASA and USGS; building heights and topography "in many locations".
• A discount when you register with an academic email address.

What Atlasly offers

• With a free account you can download 2D files (DXF, SVG, PDF, GeoJSON and the CAD bundle) for areas up to 1 km²; free drawings carry a small "Made with Atlasly" credit. Larger areas and 3D files (OBJ, GLB, KMZ) are available with Professional at £19 a month or with one-off site credits. Enrolled students can request a reviewed student rate of £9 a month.
• DXF in metres with separate layers for buildings, road classes, paths and rail, water, green space, trees and contours. Contours keep their level as the polyline elevation, so AutoCAD shows it in Properties.
• For sites in Great Britain the DXF uses British National Grid coordinates by default; elsewhere it is in local metres measured from the centre of your export area.
• A CAD bundle (zip) with the DXF, a scaled SVG, an A3 print PDF with legend and scale bar, GeoJSON, a coordinate manifest and import notes.
• 3D files with Professional or one-off site credits: OBJ (zipped with materials) and GLB with building heights from the source data or stated defaults, and KMZ for Google Earth.
• For UK sites, optional planning layers in the same file: flood, conservation area, listed building, tree preservation, Article 4 and ground records where available.
• Beyond the file: a site map, elevation profiles, figure-ground and sun path diagrams, and AI site diagrams and renders in Atlasly Vision.

CadMapper and Atlasly side by side

When CadMapper is the better choice

• You need a native SketchUp or Rhino file and do not want to import a DXF.
• You want a whole city's road network in one 2D file.
• You need an area between 1 and 100 km² once and prefer to pay per file rather than per month.

When Atlasly is the better choice

• You want a print-ready PDF and a layered SVG for your board as well as the CAD file, from the same export.
• You want contours that keep their levels, or a coordinate manifest that records where the drawing sits.
• Your site is in the UK and you want flood, heritage and other constraint layers on the same drawing.
• You will go on to make site diagrams, sun path studies or renders of the same site.

How to export your site with Atlasly

• Open Export Map in Atlas AI and search for your site address or place name.
• Draw the export area. Keep it to 1 km² or less on a free account.
• Choose the layers you need. Buildings, roads, water, green space and contours are on by default.
• Pick a data level: Standard suits most sites; Complete adds more building sources and takes longer.
• Choose DXF for CAD, or the CAD bundle for DXF, SVG, PDF and GeoJSON together, then download.
• Open the DXF in your CAD software and check the units (metres) and layers before you start drawing.

Data and accuracy

Map data is mainly from OpenStreetMap and its contributors, with other open building sources added at the higher data levels. It is community data: check it against a survey or official mapping before you rely on dimensions. The same is true of CadMapper, which also uses OpenStreetMap. Missing buildings and simplified roads are the most common gaps in either tool, especially outside large cities.