# ResiCalc: Resistor Networks — Equivalent resistance solver

> Equivalent resistance solver (iPhone/iPad app by 光浩 李.)

- Source: https://appshunter.io/ios/app/resicalc-resistor-networks/id6757947341 (this page in markdown: same URL + `.md`)
- Developer: [光浩 李](https://appshunter.io/developer/1576352133)
- Category: Utilities, Education
- Price: Free
- Age rating: 4+
- Requires: iOS 17.6 · 4 MB
- Languages: English, Chinese
- Released: 2026-05-22
- Data updated: 2026-10-10
- User reviews in markdown: https://appshunter.io/ios/app/resicalc-resistor-networks/id6757947341/reviews.md

## What is ResiCalc?

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.


## Version history (last 2 releases)

### 1.1 — 2026-10-02

ResiCalc 1.1 is a complete redesign:

• New canvas with grid snapping, undo/redo, pinch zoom and drag-to-connect
• Step-by-step solutions: series, parallel, Y–Δ transforms and balanced bridges, each with a diagram
• Full analysis: node voltages and per-resistor current and power
• Current arrows, voltages and a power heat map right on the canvas
• Tolerance analysis: worst case, Monte Carlo and sensitivity
• Toolbox: color code, E-series, combination finder, voltage divider designer
• Multiple projects and 11 classic circuit templates
• PNG and PDF report export
• English and Chinese, Dark Mode

### 1.0 — 2026-01-18

No release notes.

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## More apps by 光浩 李

- [EQ: Chemical Equation Balancer](https://appshunter.io/ios/app/eq-chemical-equation-balancer/id6757898031)
- [Hex Snake: Neon Hive](https://appshunter.io/ios/app/hex-snake-neon-hive/id6757907463)
- [3D Geometry: Solids & Sections](https://appshunter.io/ios/app/3d-geometry-solids-and-sections/id6757910669)
- [MathScope: Graphing Calculator](https://appshunter.io/ios/app/mathscope-graphing-calculator/id6757952262)
- [时间折叠](https://appshunter.io/ios/app/id6757955622)

All apps by 光浩 李: https://appshunter.io/developer/1576352133

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-10.*