CircuitSim
Free browser circuit simulator with a full SPICE engine
Details
- External ID
- 1252825
- Source
- PH
- Company
- —
- Product
- CircuitSim
- Website domain
- producthunt.com
- Launched
- Sept. 17, 2026
- Cohort
- —
- Upvotes
- 2
- Upvotes percentile
- 0.7405388069275176
- Tags
- Education, Developer Tools, Maker Tools
- Fetched at
- Sept. 18, 2026, 4:40 a.m.
- Updated at
- Sept. 18, 2026, 4:40 a.m.
Description
CircuitSim is a free, browser-based circuit simulator powered by SPICE. Design and simulate electronic circuits online with 5,000+ components, a schematic editor, and real-time waveform charts. Try an idea before you order parts, or see why a circuit misbehaves. For educators teaching the next generation of electrical engineers, students eager to learn, and hobbyists building their next big idea.
Enrichment
- Theme
- typing games and skill trainers
- Vertical
- Manufacturing
- Function
- Dev tools
- Audience
- Developer
- AI stance
- Not AI
- Project type
- Hobby / open-source project
- Normalized one-liner
- browser circuit simulator for electrical engineers
- Manually corrected
- False
Could you build this?
Partial While schematic canvases and WebAssembly-compiled SPICE engines (like ngspice or spice.js) exist, building a production-ready schematic capture tool connected smoothly to a 5,000+ component library and reliable SPICE solver in the browser requires deep electronics domain knowledge.
What it would actually take: The architecture involves a WebAssembly compilation of a C-based SPICE engine (e.g., ngspice) combined with a canvas/SVG schematic editor (React/HTML5 Canvas) and high-performance charting (e.g., WebGL or uPlot) for transient waveforms. The hard part is managing SPICE convergence failures, netlist parsing, modeling non-ideal electronic components accurately, and translating visual wire connections into error-free SPICE netlists. It requires electrical engineering domain expertise and advanced systems/WASM integration skills.
Competitors
Other products that read as similar to this one — 15 launches clear the similarity bar, closest 8 shown.
Attention rank: #8 of 16 (itself plus its competitors, highest first — normalized so YC and Product Hunt are compared fairly).
Launched 317 days after the earliest competitor.
- Circuit Artist · hn · 2025-12-31 · 135 upvotes · similarity 0.40
- Circuit Detective · ph · 2026-09-24 · 1 upvotes · similarity 0.38
- SPICE simulation → oscilloscope → verification with Claude Code · hn · 2026-04-17 · 121 upvotes · similarity 0.37
- I made some transistor animations · hn · 2026-07-24 · 212 upvotes · similarity 0.36
- EasyCircuit · ph · 2026-07-28 · 180 upvotes · similarity 0.35
- electrical-engineering · github · 2026-09-20 · 416 upvotes · similarity 0.35
- Industrial Calculators · ph · 2026-09-25 · 1 upvotes · similarity 0.33
- Qumulator · hn · 2026-04-27 · 14 upvotes · similarity 0.32
Other launches for this product
Same idea, different domain
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