Comparison
PolySim OS vs LTspice
LTspice is a fast, free, industry-trusted SPICE circuit simulator — unbeatable for analog circuit design on the desktop. But it's Windows/desktop-first and covers only electronics. PolySim runs in any browser and spans circuits plus physics, math, controls, DSP, and more.
PolySim OS
From $0 (free local) · $24/mo Independent Researcher
LTspice
Free (Analog Devices).
See PolySim in action
Live, interactive simulators that run free in your browser — no install, no license.
Feature comparison
| Feature | PolySim OS | LTspice |
|---|---|---|
| Price | Free locally | Free |
| Runs in browser | Yes | No — desktop app |
| Scope | Circuits + physics/math/DSP/controls | Analog/mixed circuits only |
| Shareable links & embeds | Yes | No |
| Interactive sliders | Yes | Parameter sweeps |
Where LTspice is strong
- • Fast, accurate SPICE engine
- • Huge device library
- • Trusted by EEs
Where PolySim wins
- • Desktop-only
- • Electronics-only
- • No browser/sharing
Choose LTspice for serious analog circuit design; choose PolySim for browser-based, multi-domain simulation and teaching that includes circuits.
Switching from LTspice?
Chemistry Reaction Kit — $19
Reaction kinetics, equilibrium, and transport simulations.
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