# CircuitJS

7 Hacker News commenters recommended CircuitJS and 0 criticized it, November 2025 to November 2026. It was recommended in 5 of 13 months.

**Verdict:** Free, browser-based circuit simulator that people use to prototype analog circuits and teach electronics. Critics raised no recurring complaints.

## Why people recommend it

- Good for prototyping circuits (2 comments): "a very useful circuit simulator which I regularly use for prototyping" ([source](https://news.ycombinator.com/item?id=49318605)) "quick for prototyping custom analog circuits" ([source](https://news.ycombinator.com/item?id=47139450))
- Praised as excellent and amazing (2 comments): "Also the amazing https://www.falstad.com/circuit/circuitjs.html" ([source](https://news.ycombinator.com/item?id=47136988)) "is excellent and far better than the mess of a breadboard IMHO" ([source](https://news.ycombinator.com/item?id=47146179))

## Alternatives hackers recommend

- [Circuit Artist](https://hackerapproved.com/p/circuit-artist.md): 11 recommend
- [Falstad Circuit Simulator](https://hackerapproved.com/p/falstad-circuit-simulator.md): 6 recommend
- [NAND-16](https://hackerapproved.com/p/nand-16.md): 5 recommend

## Cite as

Hacker Approved, "CircuitJS", https://hackerapproved.com/p/circuitjs/ (counts from 1,795,640 Hacker News comments, November 2025 to November 2026).