Singular: Circuit Simulator

Singular is a professional-grade analog & logic circuit simulator designed for your iPhone and iPad. Build, simulate, and analyze electronic circuits with an intuitive drag-and-drop editor and a powerful real-time simulation engine — no internet required.

Whether you're an electrical engineering student studying for exams, a maker prototyping your next project, or a professional verifying a design, Singular gives you a complete electronics workbench in your pocket.

POWERFUL SIMULATION ENGINE
• Modified Nodal Analysis (MNA) with TR-BDF2 adaptive solver
• Real-time transient, DC, and AC analysis
• Frequency-aware adaptive timestep — accurate results at any speed
• Newton-Raphson nonlinear convergence for semiconductors
• Hot-swap: modify your circuit while simulation is running

40+ ELECTRONIC COMPONENTS

Passive — Resistor, Capacitor, Inductor, Potentiometer
Sources — DC Voltage, AC Voltage, Pulse Generator
Diodes — Standard Diode, Ideal Diode, LED
Transistors — NPN, PNP, Darlington PNP, N-MOSFET, P-MOSFET
Integrated Circuits — NE555 Timer, Operational Amplifier (Op-Amp)
Logic Gates — AND, OR, NAND, NOR, XOR, XNOR, Inverter, Buffer
Flip-Flops — D, JK, T Flip-Flop, SR Latch
Measurement — Voltmeter, Ammeter
Power Rails — Ground, VCC, VDD, VSS, VEE, ±3.3V, ±5V

REAL-TIME OSCILLOSCOPE
• Multi-trace display with color-coded signals
• Adjustable time base and voltage scale
• Pinch-to-zoom and pan gestures
• 60 fps rendering — smooth and responsive

INTUITIVE CIRCUIT EDITOR
• Drag-and-drop component placement with grid snapping
• Draw wires by tapping terminals — automatic routing
• Rotate, flip, and mirror components freely
• Multi-select, move, and organize your design
• Full undo/redo history (up to 100 steps)
• Pinch zoom (0.1x–5x) and two-finger pan

PROFESSIONAL TOOLS
• Design Explorer with automatic reference designators (R1, C2, U3…)
• Standard value picker — E12, E24, E96 resistor series and standard capacitor values
• Built-in expression evaluator — type "10k*2.2" and get the result instantly
• Real-time voltage, current, and power readouts on every component
• Net name visualization for complex designs

LEARN & EXPLORE
• Built-in example circuits: Voltage Divider, Current Divider, Inverting Amplifier, 555 Timer Demo
• Resource Center with reference articles
• Detailed simu