You build electronics at home or in a personal lab. You want to find a part fast, avoid buying something you already have, and put a label on a drawer. PartsBox does this on the free plan.
Keep your parts in one place, with stock, storage locations, and datasheets. Search by name, MPN, or short ID to find a part and see how many you have, so you do not reorder something already in a drawer. Print labels with a QR code or barcode, and scan them to find a part or a bin. Import a BOM from KiCad when a project needs one, and add custom fields for the details you care about.
The free Maker plan is for one person and a single database (no sharing). It is a real tool, not a trial, and it stays free.
Start on the free Maker plan. When a project grows into a product, the paid plans add BOM pricing, purchasing, production builds, and lot control.