To support constants lookup for the SciBmad project, we introduced AtomicAndPhysicalConstants.jl, a Julia package that provides physical constants, subatomic particle properties, and atomic isotope data. It aggregates datasets from NIST (CODATA) and the Particle Data Group, offering a unified interface. The package supports configurable unit systems and data types, and integrates with the Julia package Unitful.jl. The package emphasizes speed and ease of use, making it well-suited for high-performance simulations and physics-driven modeling.