EveryCircuit

All joking aside, this time you will understand how electronic circuits work.
"I stumbled upon some serious gold" - GeekBeat.tv
"This app takes design to a whole new level of interactivity" - Design News
Build any circuit, tap play button, and watch dynamic voltage, current, and charge animations. This gives you insight into circuit operation like no equation does. While simulation is running, adjust circuit parameters with analog knob, and the circuit responds to your actions in real time. You can even generate an arbitrary input signal with your finger!
That's interactivity and innovation you can't find in best circuit simulation tools for PC.
EveryCircuit is not just an eye candy. Under the hood it packs custom-built simulation engine optimized for interactive mobile use, serious numerical methods, and realistic device models. In short, Ohm's law, Kirchhoff's current and voltage laws, nonlinear semiconductor device equations, and all the good stuff is there.
Growing library of components gives you freedom to design any analog or digital circuit from a simple voltage divider to transistor-level masterpiece.
Schematic editor features automatic wire routing, and minimalistic user interface. No nonsense, less tapping, more productivity.
Simplicity, innovation, and power, combined with mobility, make EveryCircuit a must-have companion for high school science and physics students, electrical engineering college students, breadboard and printed circuit board (PCB) enthusiasts, and ham radio hobbyists.
EveryCircuit is free to download and use. There is an option to purchase the full version of EveryCircuit that allows you to build and simulate large circuits, save unlimited number of circuits, store them on cloud, and sync between your devices. It is available via a one time in-app purchase for $14.99. The app requires a permission to access your account for authentication in EveryCircuit community.
Analyses:
DC analysis
AC analysis with frequency sweep
Transient analysis
Features:
Growing public library of community circuits
Animations of voltage waveforms and current flows
Animations of capacitor charges
Analog control knob adjusts circuit parameters
Automatic wire routing
Oscilloscope
Seamless DC and transient simulation
Single play/pause button controls simulation
Saving and loading of circuit schematic
Mobile simulation engine built from ground-up
Shake the phone to kick-start oscillators
Intuitive user interface
No Ads
Components:
Sources, signal generators
Controlled sources, VCVS, VCCS, CCVS, CCCS
Resistors, capacitors, inductors, transformers
Voltmeter, amperemeter, ohmmeter
DC motor
Potentiometer, lamp
Switches, SPST, SPDT
Push buttons, NO, NC
Diodes, Zener diodes, light emitting diodes (LED), RGB LED
MOS transistors (MOSFET)
Bipolar junction transistors (BJT)
Ideal operational amplifier (opamp)
Digital logic gates, AND, OR, NOT, NAND, NOR, XOR, XNOR
D flip-flop, T flip-flop, JK flip-flop
SR NOR latch, SR NAND latch
Relay
555 timer
Counter
7-segment display and decoder
Analog-to-digital converter
Digital-to-analog converter