Before buying this app you can try the free version (with ads) named "Electric Circuit Studio". The full documentation is available at ecstudiosystems.com/help
There you can see that labels (grey border boxes) can be moved and switches can be switched using long tapping, etc. We also recommend to view the Screencast Tutorial on our YouTube channel.

ECStudio is a set of tools used for building electronic circuits, SPICE simulation, and calculation of circuits. These tools are complemented by the information center containing resources, connector pinouts and short interactive book explaining basic electrical theorems, laws and circuits. It is a useful application for all electronics hobbyists, students, or other people with an interest in electronics.

• Schematic editor and SPICE simulator
These tools allow easy creation of circuit diagrams and SPICE analysis of the created circuits. ECStudio simulator is focused on visual representation of simulated results, such that simulated voltages and currents can be placed elsewhere in the circuit, as a text or graph. Moreover, the magnitude and polarity of voltages and currents can be represented by visual indicators, so you can check the results quickly. All results can be additionally displayed on the top plot, where they can be explored using two cursors.

DC, AC and Transient analyses are supported.

The simulation can be run repeatedly (in Transient analysis) and results can be displayed consecutively with a user controlled speed (in all analysis types), or all simulation results are displayed immediately. When the results are shown consecutively, you can control parameters of circuit elements by the seek bar and see the change of results in real time.

In AC analysis, you can display the magnitude, real value, imaginary value and phase of voltages and currents.

The schematic editor supports undo and redo and also working with several selected elements. All elements except wires allow proper rotation and flipping of the text inside elements.

Supported elements: wire, ground, resistor, capacitor, polarized capacitor, inductor, DC voltage source, pulse source, sinusoidal source, DC current source, text, picture, diode, zener diode, LED, transistors (NPN, PNP, NMOS, PMOS, NJFET, PJFET), logic gates (NOT, AND, NAND, OR, NOR, XOR, XNOR), SR latch, D flip-flop, T flip-flop, JK flip-flop, operational amplifier, 555 timer, LM317, LM337, 7805, 7905, VCVS, VCCS, CCVS, CCCS, potentiometer, transformer, switch SPST, switch SPDT, open push-button, closed push-button, relay SPST, relay SPDT, crossover.

Models of diodes and transistors can be inserted through the shared directory.
Screenshots and exporting the whole circuit are also supported.
Wires are drawn using autorouting or they can be drawn manually using single-segment lines.

• Calculators: Ohm's law, Resistors in series/parallel, Series-parallel circuit, Y-Delta transformation, Resistor for voltage attenuation, Power calculator, Voltage divider, Current divider, RLC reactance/impedance, LC resonance, Passive filters, Capacitor charging, Transformer calculations, Resistor for LED, Zener diode, Operational amplifier, LM317 voltage regulator, 555 timer, A/D and D/A converters, Coil inductance, Voltage drop, Resistor color code, SMD resistor code, Inductor color code, RMS calculator, Frequency/period converter, Battery capacity conversion, Battery life, Decibel converter, PCB trace width calculator

• Connector pinout
SCART, VGA, DVI, HDMI, Firewire, USB, Thunderbolt, Apple Lightning, Apple dock, RS-232, Sata, eSata, PS/2, ATX power connectors, SD cards, SIM cards, Ethernet RJ45, RJ11, RJ14, RJ25, ISO10487 for car audio, XLR, LED, Raspberry GPIO

• Resources
Wire size, Wire insulation colors, Ampacity, Resistivity, Resistor values, Capacitor codes, Capacitor values, SMD packages, Units of measurement, SI prefixes, 7400 series of integrated circuits, Voltage regulators, Logic gates, Electrical symbols, USB specifications