To help you decide, here is the essential feature checklist you must look for in the best mobile schematic diagram tool for your needs:

  • iCircuit (iOS, Android)

  • ElectroDroid Pro (Android)

  • DroidTesla / Circuit Simulator (Android open-source variants)

  • TinkerCAD (web, mobile browser)

  • Upverter / CircuitLab (web, mobile browser)

    • Recommendation (decisive):

    If you want, I can list feature comparisons (component libraries, simulation types, pricing) in a table for 4–6 chosen apps.

    PDFs are dead. You need bitmap images or vector graphics. You need to zoom into a tiny 0201 capacitor and see the silkscreen labels clearly. Blurry images lead to ripped pads.

    There is a category of apps (often just called "PCB Board View" or generic "Schematics Viewer") available on the App Store. These are usually wrappers for PDFs or static image boards.