Acoustic Index is a database and planning resource for acoustic materials, helping engineers, planners, architects and manufacturers find, compare and evaluate products using measured data. The platform lists 2,004 products and 4,373 measured variants, with values linked to their sources, such as laboratory test reports, product datasheets and environmental product declarations (EPDs), where available. Product information includes absorption and diffusion values, test conditions, mounting details and air gaps, supporting more informed comparisons.

Its catalogue covers sound absorbers, acoustic panels, wood panels, acoustic foam, wall art, ceiling systems, baffles, screens and partitions, among other categories. Search filters allow users to refine results by noise reduction coefficient, frequency band, product type and mounting. Planning tools include a reverberation calculator, an acoustic panel calculator, side-by-side absorption curve comparisons, and project shortlists that users can annotate and share. Acoustic Index also provides room-acoustics guides, information for manufacturers, a measurement service and an API. A permanently free account is available for users who want to save and organise products for their projects.