# Circuit Design & Simulation — Draw, Simulate, Breadboard

> Draw, Simulate, Breadboard (iPhone/iPad app by 志义 范.)

- Source: https://appshunter.io/ios/app/circuit-design-and-simulation/id6822767192 (this page in markdown: same URL + `.md`)
- Developer: [志义 范](https://appshunter.io/developer/6822509575)
- Category: Education, Utilities
- Price: Free with in-app purchases
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 17.0 · 3 MB
- Languages: American English, Chinese (Simplified, China)
- Released: 2026-11-02
- Data updated: 2026-11-13

## What is Circuit Design & Simulation?

Take circuits off the page: draw them, power them up, then build them by hand.

SCHEMATIC
• Standard symbols: resistors, capacitors, diodes, LEDs, Zener diodes, transistors, relays, switches, motors, buzzers, sensors, logic gates, op-amps, 555 timers and more
• Choose IEC or ANSI (US) symbol style
• Snap-to-grid wiring; rotate, flip and swap parts in a tap; Apple Pencil support
• Color themes and art styles; export crisp images of your schematic

SIMULATION
• Turn a schematic into a working simulation in one tap. A checklist points out missing values and wiring problems one by one
• Moving green dots show current; blue numbers show the voltage at each node
• Flip switches, press buttons, turn potentiometers, change light and temperature, and the circuit responds instantly
• Watch capacitors charge and discharge, transistors amplify and switch, relays latch, logic gates oscillate and 555 timers count down
• Oscilloscope for waveforms; record the current animation and export it as a GIF

BREADBOARD
• Realistic breadboard, battery box, components and chips: follow the schematic and plug them in step by step
• Or build freely, picking parts from the parts list
• Power it up to check your work: does the lamp light, does the motor turn?
• Analog and digital multimeters measure voltage, current and resistance

EXAMPLES
12 complete examples: basic circuit, capacitor charge and discharge, rectifier with filter and regulator, sensors and transistors, Darlington pair, transistor latch, three-person voting circuit, logic-gate oscillator, relay motor reversing, op-amp oscillator, 555 oscillator and 555 timer. Each comes as a schematic, a simulation and a breadboard, and you can change anything. To keep your changes, save it as your own circuit.

EVERYDAY USE
• Syncs between iPad and iPhone through iCloud
• Share a link and anyone can open your circuit in a web browser
• No sign-up, no ads, no personal data collected
• English and Chinese

Great for physics and technology classes, electronics hobbyists and makers, and teachers demonstrating in class.

MEMBERSHIP
Free forever: drawing and exporting schematics, plus everything in the 12 examples (including their simulations and breadboards).
Membership unlocks: simulating circuits you draw yourself, the breadboard for your own circuits, and art styles.
• Yearly membership: auto-renewing subscription, billed yearly
• Lifetime membership: one-time purchase
Both support Family Sharing. Payment is charged to your Apple Account at confirmation of purchase. The subscription renews automatically unless cancelled at least 24 hours before the end of the current period; your account is charged for renewal within 24 hours before the end of the period. Manage or cancel in Settings → Apple Account → Subscriptions.

Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://saviteachingassistant.cn/circuit/privacy-en.html

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Yearly Membership | $4.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Lifetime Membership | $14.99 | one-time |


## Is Circuit Design & Simulation safe?

Not enough ratings yet to assess Circuit Design & Simulation.

## Is Circuit Design & Simulation legit?

Circuit Design & Simulation has limited verification signals. The AppsHunter Legitimacy Score for Circuit Design & Simulation is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 4 releases)

### 1.0.3 — 2026-11-08

· Heating elements now glow when powered and actually warm the temperature sensor in the box — great for demonstrating thermostat control and hysteresis
· Motors can be set to "stalled" to demonstrate stall-detection circuits
· Cleaner wire deletion in schematics: cutting a wire also removes dangling segments, and wires lying on top of other wires are removed automatically
· Fixed: an extra junction dot appeared where two wires meet end to end in the simulator
· My Circuits: expand or collapse all folders with one tap
· New featured circuits: fridge-door alarm, battery charge cutoff, quiz buzzer, combination lock and more

### 1. 0. 2 — 2026-11-04

· Tag filter: a new tag bar under the library search box helps you find circuits by function or component. Combine multiple tags to narrow results.
· New 4-input AND, OR, NAND and NOR gates: select a gate and tap "4-in" on the toolbar to switch. The breadboard uses the matching chip automatically (74LS20 / 74LS21 / CD4072 / CD4002).
· Improved top bar layout on small iPhone screens
· Other refinements and bug fixes

### 1.0.1 — 2026-11-03

· New plot tool for circuit diagrams: waveforms, logic timing, characteristic curves
· Featured gallery: browse for free, opening a project requires membership
· Fixed membership status flipping between devices

### 1.0 — 2026-11-02

No release notes.

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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 2026-11-13.*