PartSets vs ResiCalc

This app provides you with convenient parts (items) management services.  No matter how many parts or items you have, you can add them to easily manage your parts or items.  Supports iCloud synchronization and can be operated on multiple devices for easy management.^  Part category and remaining quantity, allowing you to have a clear management.  Do you have PDF Resource for the parts? Never mind! You can save the PDF file of the part at the same time.* No one can see your data. Ensure data security. (Your data is saved through iCloud services)  'PartSets' helps manage parts!  Notes: ^You need to log in to iCloud accounts with the same Apple ID on multiple devices. *Subscription or purchase of 'Advanced Features' is required to add PDF Resources. View PDF Resources only without subscription or purchase. The subscription will NOT be automatically renewed, and manual renewal is required after expiration. "Advanced Features" can be used simultaneously on devices logged in with the same Apple ID.

ResiCalc turns any resistor network into a clear answer — and shows you exactly how it got there. From high-school series/parallel problems to Wheatstone bridges and Y–Δ transforms in circuit theory, to voltage dividers and power checks at the bench, ResiCalc solves it and explains it. DRAW IT, SOLVE IT • Tap to place nodes, drag to connect resistors; 0 Ω is an ideal wire • Grid snapping, undo/redo, pinch to zoom and pan • Pick any two nodes as terminals — the equivalent resistance updates live • IEC rectangle or ANSI zig-zag resistor symbols STEP-BY-STEP SOLUTIONS • Merges wires, removes dangling and floating branches, combines series and parallel • Detects balanced bridges; otherwise applies Y–Δ (star–mesh) transforms • Every step comes with an explanation, the worked formula and a diagram • Great for homework checks, exam revision and teaching FULL CIRCUIT ANALYSIS • Apply a voltage or current source across the terminals • Node voltages plus voltage, current, power and load ratio for every resistor • Current arrows, node voltages and a power heat map directly on the canvas • Set power ratings and get overload warnings ENGINEERING-GRADE TOLERANCE • Exact worst-case bounds • Monte Carlo histogram and yield • Sensitivity ranking shows which resistor deserves a precision part RESISTOR TOOLBOX • 4/5/6-band color code, both directions • E3–E192 standard values • Combination finder: hit any value with 2–3 standard resistors • Voltage divider designer • Ohm's law and quick series/parallel calculators MORE • Multiple projects and 11 classic templates (resistor cube, R-2R ladder, 3×3 grid…) • Export PNG schematics and multi-page PDF reports • English and Chinese, Dark Mode • Fully offline, no data collection, no ads FREE AND PRO Drawing circuits, equivalent resistance, templates and the core tools are free. ResiCalc Pro is a one-time purchase (no subscription) that unlocks full analysis, all solution steps, tolerance analysis, the combination finder, divider designer, unlimited projects and PDF reports.