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CircuitMath is a free web-based circuit analysis tool for electrical and computer engineering education. Users draw linear circuits in a drag-and-drop editor, click Analyze, and receive KVL, KCL, MNA matrix equations, and possible transfer functions, along with clean LaTeX output. Its focus is symbolic derivation, not SPICE-style simulation; it does not perform operating-point, transient, or frequency-sweep numerical simulations, but instead produces closed-form expressions similar to textbook hand calculations.
The tool supports resistors, capacitors, inductors, voltage sources, current sources, ground, controlled sources, and BJT/MOSFET devices. For transistor circuits, it automatically removes DC bias sources and replaces devices with hybrid-π small-signal models before running the analysis. Controlled sources include VCVS, VCCS, CCVS, and CCCS, making it suitable for building custom small-signal models or feedback networks. During analysis, circuits are converted into Lcapy netlists and SymPy is used for symbolic computation. Results can be copied as LaTeX with one click, which is convenient for Overleaf, Word LaTeX plugins, Markdown/KaTeX, or reports.
Pricing is straightforward: no account, no subscription, no paywall, no premium tier, and no trial limits. The website says it is supported by non-intrusive ads, and ad blockers do not affect functionality. For documentation, CircuitMath offers a tutorial library with 23 listed articles covering topics such as KVL, KCL, voltage dividers, nodal analysis, common-emitter amplifiers, and RC low-pass filters. Each article includes derivations, example problems, and editor links, with a strong teaching-oriented focus.
Its strengths are a low learning curve, intuitive symbolic results, practical LaTeX export, and support for transistor small-signal models and controlled sources, which goes beyond ordinary beginner circuit drawing tools. The limitations are also clear: it cannot replace SPICE, and it cannot provide numerical transient analysis, frequency-domain sweeps, or operating-point results; the analysis engine depends on the server, so it is not fully offline; and because there are no accounts or server-side saving features, it is not suitable for long-term project management. It is best suited for undergraduate circuit-course students, analog-circuit graduate students, teaching assistants, instructors, and self-learners who want to check hand derivations and generate teaching materials.
The collected text does not provide information about access from mainland China, payments, or CDN infrastructure, so its China access status is unknown. Since no payment is required, there is no payment barrier. If network access is unstable, local SPICE tools, manual Lcapy/SymPy modeling, or textbook-style hand calculations can be considered as alternatives.
⚠ This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on circuitmath.com official site.
circuitmath.com is an Unknown Dev Tools provider. TG4G tracks its product information, an overall rating of 8.0/10, and a China-accessibility score of China direct-connect friendly. Click "Visit Official Site" to reach circuitmath.com directly.