Koillection is a self-hosted physical collection and inventory manager that organizes books, vinyl records, video games, stamps, trading cards, and any custom hobby catalog using hierarchical folders, reusable metadata templates, wishlists, and loan tracking. Collectors can structure nested sub-collections like a file system and attach tailored attributes to each item, ranging from star ratings, purchase dates, and country flags to autographs, PDF manuals, and video clips. Reusable item templates and choice lists standardize data entry across uniform categories so adding a new comic issue or board game takes seconds rather than repetitive typing. Custom HTML and JSON scrapers let you pull item titles, cover art, and structured fields directly from external catalog websites into your forms using XPath or JMESPath selectors. Cross-collection tags link related pieces across separate folders, while dedicated photo albums store supplementary event galleries or condition photographs alongside your main inventory. Built-in wishlists track desired acquisitions with target prices and currencies, and a loan manager records which friend borrowed an item and when it was returned. Granular visibility settings let households run independent multi-user accounts or share read-only collection pages with guests, and a REST API exposes every catalog entity for external automation. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. MIT licensed.