Basics

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。

uSimmics(ex QucsStudio): Overview and How to Use This Free Circuit Simulator

QucsStudio has been renamed to uSimmics (formerly QucsStudio). Learn why the name changed, what’s different, how it compares with Qucs, and how to use key features like S-parameters, harmonic balance, tuning, and Monte Carlo analysis.

How to Install uSimmics (formerly QucsStudio)

Step-by-step Windows guide to install uSimmics (formerly QucsStudio). Download the ZIP, extract it, start with start.bat, and find uSimmics.exe in /bin.

uSimmics (formerly QucsStudio) Initial Setup Guide: Optimizing Your Simulation Workflow [2026]

A complete guide to setting up QucsStudio! Learn how to optimize Document Settings and Application Settings for a more efficient simulation workflow. Perfect for beginners looking to quickly configure their environment.

How to Change the Project Folder Location in uSimmics (formerly QucsStudio) [2026]

Learn how to easily change the project folder location in QucsStudio. This guide provides step-by-step instructions to customize the project folder path using shortcuts. Perfect for beginners to organize their simulation files effectively.

Circuit Editor Basic Operations Guide for uSimmics (formerly QucsStudio) [2026]

The Basic Operations Guide for Qucs Studio provides a detailed explanation of how to effectively use the circuit simulation software, introducing the operational procedures of each mode through mouse and keyboard actions. Packed with information beneficial for beginners to advanced users.

How to Create and Use Subcircuits in uSimmics (formerly QucsStudio) [2026]

An all-inclusive guide to efficiently creating and mastering subcircuits in Qucs Studio. From beginners to advanced users, learn how to design and utilize subcircuits with easy steps.

Circuit Optimization Guide for uSimmics (formerly QucsStudio) [2026]

This tutorial provides a step-by-step guide on how to optimize circuits using the Circuit Optimizer feature in Qucs Studio, offering a practical guide for effective circuit design from beginners to advanced users.

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