NL5 Circuit Simulator
There are plenty of circuit simulators available on the market. Just read their ads: high performance, extremely fast, industry-standard (i.e. SPICE), easy to use, highly intuitive. If you want to see if a tool is worth using, try it yourself. That's what many NL5 users already did. I hope they will share their encouraging stories soon. A few words about what should you expect from NL5. It is not one more SPICE (and not even close), nor is it a SPICE replacement. For some tasks NL5 is far superior, for others simply good, and some tasks are not for NL5 at all.
Learn more
CircuitSim
CircuitSim is a full SPICE circuit simulator with a 3,000+ component library and a modern schematic editor. No install, free to get started. Built for students, educators, and professionals.
It runs in a browser tab and needs no admin rights, so it works on Chromebooks and locked-down school laptops. Run seven kinds of analysis: interactive, interactive operating point, transient, AC sweep, DC operating point, DC sweep, and parameter sweep. Results plot on oscilloscope-style charts, with probes you can drop anywhere in the circuit. Define custom parts from SPICE model text or import KiCad symbols.
CircuitSim also imports Multisim Live designs ahead of that product's retirement on September 15, 2026. It is the only browser tool that opens .csim, .ms14, and .msjs files, and it rebuilds the schematic with wiring, placement, net labels, probes, and simulation settings intact.
Classroom licensing adds seat assignment, anonymous student seats, and private student work.
Learn more
OrCAD X
OrCAD® X is a unified PCB design software platform that offers significant improvements in ease of use, performance, automation, data management, and collaboration. Our cloud-enabled product suite contains applications for schematic, simulation, and PCB layout. OrCAD X Capture is one of the most widely used schematic design solutions for the creation and documentation of electrical circuits. PSpice® is our virtual SPICE simulation environment integrated within Capture that allows you to prototype your designs using the industry-leading, native analog, mixed-signal, and advanced analysis engines to deliver a complete circuit simulation and verification solution. Our two PCB layout environments, OrCAD X PCB Editor and OrCAD X Presto, allow designers to easily collaborate between ECAD/MCAD teams and build better PCBs faster. OrCAD X Presto is a new user-friendly option offering a simpler interface for quick-turn PCB design.
Learn more
TopSpice
TopSpice is a true analog/digital/behavioral mixed-mode circuit simulator for the PC. It offers the most advanced SPICE simulator in its price range, compatibility, an easy to use integrated design environment from schematic capture to graphical waveform analysis, and full 64-bit operation for faster performance and larger memory space. With TopSpice you have the choice to design from schematic drawings, text netlist (SPICE) files, or both. All design and simulation functions are available from either the schematic or netlist editor front-ends. TopSpice includes a native full-featured mixed-mode mixed-signal circuit simulator capable of simulating circuits containing any arbitrary combination of analog devices, digital functions and high-level behavioral blocks. With TopSpice you can verify and optimize your design from the system to the transistor level.
Learn more