# iDroidSim — Circuit SPICE simulator

> Interactive circuit simulator for electronics design and calculations. (iPhone/iPad app by Vladimir Djokic.)

- Source: https://appshunter.io/ios/app/idroidsim/id6471349087 (this page in markdown: same URL + `.md`)
- Developer: [Vladimir Djokic](https://appshunter.io/developer/1483350231)
- Category: Education, Productivity
- Price: $9.99
- Age rating: 12+
- Requires: iOS 15 · 61 MB
- Languages: American English
- Released: 2024-06-04
- Data updated: 2026-07-06
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/idroidsim/id6471349087/reviews.md

## What is iDroidSim?

iDroidSim is a simple and powerful circuit simulator.
Perfect for students new to electronics circuit design and construction, 
hobbyist and tinkerers and even seasoned professionals who want a quick, 
handy tool to perform electronics circuit design calculations.

That's interactivity and innovation you can't find in best SPICE tools for PC.

iDroidSim simulator solves basic resistive circuits using Kirchoff’s Current Law (KCL) 
in much the same way a student in a circuits class would,the simulator systematically forms a matrix in accordance
with KCL and then proceeds to solve for the unknown quantities using various algebraic
techniques such as Gaussian elimination and sparse matrix techniques.

For non-linear components, such as the diode and BJT ,iDroidSim engine searching for the approximate solution by making an initial guess at an answer
and then improving the solution with successive calculations built upon this guess.
This is called an iterative process.iDroidSim simulation uses the Newton-Raphson iterative algorithm
to solve circuits with non-linear I/V relationships.

For reactive elements(capacitors and inductors),the iDroidSim uses numeric integration methods to approximate the state of the reactive elements as a function of time.
iDroidSim offers the Trapezoidal(I'll add a GEAR method later) integration methods to approximate the state of the reactive elements.
Although for most circuits, both methods will provide almost identical results,
it is generally regarded that the Gear method is more stable, but trapezoidal method is faster and more accurate.

iDroidSim for now can simulate:
-Resistor
-Capacitor
-Inductor
-Potentiometer 
-Light Bulb 
-Ideal operational amplifier
-Bipolar junction transistor (NPN PNP)
-MOSFET N-channel depletion
-MOSFET N-channel enhancement
-MOSFET P-channel depletion
-MOSFET P-channel enhancement
-JFET N and P
-PN Diode
-PN Led diode
-PN Zener diode
-AC current source
-DC current source
-AC voltage source
-DC voltage(battery) source
-CCVS - current controlled voltage source
-CCCS - current controlled current source
-VCVS - voltage controlled voltage source
-VCCS - voltage controlled current source
-Square wave voltage source
-Triangle wave voltage source
-AC ampermeter
-DC ampermeter
-AC voltmeter
-DC voltmeter
-Two channe oscilloscope
-SPST Switch
-SPDT Switch
-Voltage controlled switch 
-Current controlled switch 
-AND 
-NAND 
-OR 
-NOR 
-NOT 
-XOR 
-XNOR 
-JK flip-flop
-7 Segment Display
-D flip-flop
-Relay
-IC 555
-Transformer 
-Graetz Circuit

If you are making an
oscillators you have to put a small initial value on some of the
reactive elements.(see the examples)

## Key features

- Circuit simulation for electronics design
- Supports a wide range of electronic components
- Interactive analysis of resistive and non-linear circuits
- Numeric integration for reactive elements
- Tools like oscilloscopes and digital logic gates
- Suitable for students and professionals

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/idroidsim/id6471349087/reviews.md

### 5/5 — Incredibly fast & precise

*2024-06-05*

This app offers a fast way of building a circuit simulation and what’s more important the calculations made here resemble the real world behavior very accurately!

## Frequently asked questions about iDroidSim

### What is iDroidSim used for?

iDroidSim is a circuit simulator designed for electronics circuit design calculations. It's useful for students learning electronics, hobbyists, and professionals needing a quick design tool.

### What types of circuits can iDroidSim simulate?

iDroidSim can simulate basic resistive circuits, non-linear circuits with diodes and transistors, and circuits with reactive elements like capacitors and inductors. It also supports various sources and measurement tools.

### How does iDroidSim handle non-linear components?

For non-linear components like diodes and BJTs, iDroidSim uses an iterative process with the Newton-Raphson algorithm to find approximate solutions by refining initial guesses.

### Does iDroidSim support digital logic components?

Yes, iDroidSim includes a range of digital logic gates such as AND, NAND, OR, NOR, NOT, XOR, XNOR, as well as flip-flops and a 7-segment display.

### What is the price of iDroidSim?

iDroidSim is a paid application, priced at $9.99.

### On which devices can iDroidSim be used?

iDroidSim is supported on iPhones, iPads, and iPods.

### How often is iDroidSim updated?

The latest version, 7.4, was released on October 21, 2025, indicating recent development activity and ongoing support.

### What learning methodology does iDroidSim employ?

iDroidSim simulates circuit behavior using methods like Kirchoff's Current Law (KCL) and numerical integration, mirroring how students would approach circuit analysis in an academic setting.

## Version history (last 3 releases)

### 7.4 — 2025-10-21

UI  improvements

### 7.3 — 2024-06-16

Added copy/paste functionality

### 7.0 — 2024-06-04

No release notes.

## More apps by Vladimir Djokic

- [HAL 9000](https://appshunter.io/ios/app/hal-9000/id1518486203)

All apps by Vladimir Djokic: https://appshunter.io/developer/1483350231

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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 2026-07-06.*