dualmaps.com

What It Is

Dual Maps 3D is a synchronized mapping project from Map Channels. Its core idea is to link multiple perspectives side by side in the same window: 2D road/satellite maps, photorealistic 3D maps, and street-level imagery. It evolved from the earlier Dual Maps, which originally relied on Google’s 45° bird’s-eye imagery. After Google discontinued that capability, the project shifted to rendering Google Photorealistic 3D Tiles with CesiumJS, presenting a tiltable, orbitable 3D globe in the browser via the Google Map Tiles API.

Core Capabilities and Tech Stack

Functionally, it is well suited for place exploration, observing urban buildings, and comparing Street View with maps. Dual Maps 3D offers Google Maps 3D, synchronized Street View orientation, orbit animations, camera controls, and address search. Its main strength is that all three view types stay locked to the same location in real time, letting users move quickly from a road map to ground-level Street View and a bird’s-eye 3D perspective. The captured text also mentions Dual Free Maps: a fully open-source alternative that uses MapLibre GL, OpenStreetMap, ESRI satellite imagery, and Mapillary street-level photography, with no API key required.

Pricing, Openness, and Ecosystem

The main text does not provide clear commercial pricing, payment methods, or subscription tiers. Dual Free Maps is explicitly open source and does not require an API key, which is friendly for developers and educational demos. However, Dual Maps 3D uses the Google Map Tiles API and Street View, and the text does not state whether users need to provide their own key or whether Google-side costs may apply. In terms of ecosystem, it clearly depends on mapping technologies such as Google Maps, CesiumJS, MapLibre GL, OSM, ESRI, and Mapillary, but there does not appear to be a Dual Maps API/SDK or a systematic set of developer documentation.

Pros, Cons, and Best-Fit Users

The strengths are its intuitive interaction model and a complete synchronized experience across 2D maps, Street View, and 3D buildings/terrain. It also offers an open-source alternative, reducing reliance on a Google API key. The downsides are that the product information reads more like a project introduction page, with little detail on deployment, self-hosting, API Reference, support channels, or commercial terms. The 45° birds-eye imagery used by the older Dual Maps 9 has been deprecated, making it useful only as a legacy reference.

Access from China

Because Dual Maps 3D involves Google Maps, Street View, and the Map Tiles API, it is likely to be partially restricted in mainland China network environments. Dual Free Maps uses OSM, ESRI, Mapillary, and MapLibre GL, so in theory it offers a better alternative, but actual access to imagery and street-level photos still depends on the reachability of each service. For production use targeting users in China, MapLibre GL combined with compliant domestic map services may be worth evaluating as an alternative.