回路シミュレータ

What Is Qucs-S? Differences from LTspice and uSimmics Explained [2026 Edition]

Qucs-S is an open-source circuit simulator that connects the Qucs interface to SPICE engines. This article explains what Qucs-S is, how it differs from LTspice and uSimmics, and when it is useful.

What Is uSimmics? Why QucsStudio Changed Its Name and What Has Changed [2026 Edition]

uSimmics, formerly QucsStudio, is a free and powerful circuit simulator. This article explains why QucsStudio changed its name, what has changed, compatibility with old files, and its position among the Qucs family.

LTspice vs. uSimmics (formerly QucsStudio): Which Should You Use? [2026]

LTspiceとuSimmics（旧QucsStudio）の違いを機能・エンジン・用途で徹底比較。高周波RF設計ならuSimmics、アナログ電源設計ならLTspiceという使い分けの根拠を2026年版で解説します。