CalTopo offers free accounts to all users, which include a ton of features! However CalTopo also offers more map layers, advanced tools, larger PDFs, and offline functionality on a yearly subscription basis. Our subscriptions are easy to cancel and are fully refundable if you are not pleased with the product. CalTopo also offers free and discounted subscriptions to first responders and team accounts for a variety of different organizations.
CalTopo Blog

Additional Fire Focused Layers

We’ve just launched two more fire related layers. The first is a false-color visualization based on the Sentinel weekly high-resolution layer. By using Sentinel’s upper infrared bands, we discovered that we were able to provide a clear picture of burned areas and active hot spots, even when the visual imagery is entirely obscured by smoke. […]