This dataset supports the development and on-farm implementation of the Compostómetro, a web-based decision-support tool designed to formulate compost mixtures using locally available organic materials in tropical plantain and banana production systems. The study was conducted in 36 farms located in six municipalities of the department of Quindío, Colombia. The deposited files include: (i) an anonymized inventory of organic materials available on the participating farms; (ii) a technical and bibliographic database containing carbon, nitrogen, and carbon-to-nitrogen ratio values for 40 organic materials; (iii) the composition and calculated indicators of 36 compost formulations; (iv) independent computational verification of dry-mass, carbon, nitrogen, and C/N calculations; and (v) the R scripts used for data quality control, descriptive analyses, table generation, and visualization. Farm identifiers have been anonymized, and the dataset does not include farmers’ names, contact information, personal identifiers, or exact geographic coordinates. The deposited data describe the initial formulation and physical implementation of the compost piles; they do not constitute an assessment of compost stability, maturity, or final agronomic quality. The source code and technical documentation of the Compostómetro platform are available at: https://github.com/dbtrago/Compost-read.