Codelob serves as a hosted catalog and API designed for standardized reference data and classification codes. It aggregates various schemes including ISO country codes, NACE, ISCO, ESCO, CPA, ICD-10, ISCED, and CEFR, while also incorporating country-specific variants and version histories, enabling applications to access the correct code set based on jurisdiction and effective date. Developers have the capability to query codes and associated metadata through the API, specify requests to a particular version, and compare different versions to track any modifications. Each record is equipped with validity details and a fingerprint for ensuring data integrity. Targeting software developers and teams engaged in the creation or maintenance of data-intensive systems in sectors like HR, healthcare, customs, e-commerce, compliance, and occupational safety, Codelob aims to streamline their workflows. Additionally, the service provides a free access tier for those looking to evaluate the platform or requiring low-volume usage, making it more accessible to a wider audience. This flexibility allows organizations to better manage their reference data needs efficiently.