Access to over 4 million components via Digi-Key Catalog integration.A library of over 700 generic symbols, as well as custom symbol creation.Ability to diagram at the Block, Icon, System, or Schematic level.Only registered users can share and save designs. Scheme-it works natively in all major web browsers without requiring the use of any plugins. Once a schematic drawing is complete, users can export it to an image file or share it via email with others. Additionally, a built-in bill of materials manager is provided to keep track of parts used in a design. The tool includes a comprehensive electronic symbol library and an integrated Digi-Key component catalog that allows for a wide range of circuit designs. Scheme-it is an free online schematic and diagramming tool that allows anyone to design and share electronic circuit diagrams. Testing & Inspection Methods for PCB and PCBA.PCB Manufacturing Capabilities Menu Toggle.