VoltSim alternative: a logic lab in any browser
VoltSim is a realtime circuit simulator app for Android, published on Google Play by risingphoenix in the Education category. You place components on an unlimited workspace with automatic or manual wire routing, and while the circuit runs you read voltages and currents, watch them animated on the wires, and check signals on a multichannel oscilloscope or a multimeter. Its component list runs from sources, resistors, capacitors, inductors and transformers through diodes, BJTs, MOSFETs and op-amps to digital gates, flip-flops, a 555 timer, an ADC, relays, motors and speakers. The app contains ads and in-app purchases, and issues and component requests go to its GitHub page. VoltSim simulates electronic circuits on your phone, analog and digital; digiwleea is a guided lab for the digital logic inside a computer, in any browser.
What VoltSim is good at
Electronics on an Android phone or tablet: build a circuit, press play and see the current flow, then probe it with the oscilloscope and multimeter and tune values while it runs. With both analog parts and logic gates in one parts bin, it suits hobby projects and learning how circuits behave. (digiwleea is an independent project, not affiliated with VoltSim.)
How digiwleea is different
digiwleea concentrates on digital logic and runs in any modern browser, on phones, tablets and computers. Instead of placing ready-made gates and flip-flops, you build them: NMOS and PMOS transistors as switches make NOT and NAND, those make the other gates, then adders, latches, registers, RAM and an 8-bit CPU that runs a stored program, through a 40+ level course where every part is checked against its truth table, with an AI tutor (Wleea). It has no analog parts or oscilloscope; every wire is 0, 1 or floating. For voltages and currents, an app like VoltSim fits better; for how a computer is built, digiwleea does.
| VoltSim | digiwleea | |
|---|---|---|
| Focus | Analog and digital electronics | Digital logic, transistor to CPU |
| Runs on | Android (Google Play) | Any modern browser, including phones |
| Gates and flip-flops | Ready-made components | Built by you from transistors, then reused |
| Measurements | Oscilloscope, multimeter, current animation | Logic levels on every wire, truth tables, timelines |
| Price | Ads and in-app purchases | Free lab and Act I; Premium for the full course |
No sign-up is needed to start: open the lab and place your first transistor, or read the free theory course. The account (and the AI tutor) are optional.
More comparisons: Electronics and SPICE simulators
See for yourself: build a logic gate from transistors in the simulator, then follow the path from sand to an 8-bit CPU.
Open the digiwleea lab →Frequently asked
Can VoltSim simulate logic gates?
Yes. Its component list includes AND, OR, XOR, NAND, NOR, XNOR and NOT gates, logic inputs and outputs, flip-flops and a 555 timer, alongside its analog parts.
Is VoltSim free?
It is free to install from Google Play and contains ads and in-app purchases.
What is a good logic simulator that runs in the browser?
digiwleea runs in any current browser and starts from transistors: you build every gate yourself and work up to a CPU, with every part checked.