Firecracker MD includes comprehensive coverage for all of the facts and concepts that are fair game to be tested on USMLE Step 2 CK, and our USMLE Step 3 content is currently categorized under the broader umbrella of USMLE Step 2 CK materials: https://med.firecracker.me/app#/tree/2/2
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We estimate that we've covered about 75% or more of the materials you'll need to know for USMLE Step 3 in the broader umbrella of our current Step 2 CK section, and we will be continually updating this content moving forward. We plan to release a standalone USMLE Step 3 section, and will make an announcement once that is published.