SIMBA 26.03 is here

Welcome to SIMBA 26.03!

This is the biggest SIMBA update ever, with a completely reworked user experience, a chart engine rewritten from scratch, embedded Python directly in SIMBA, FMI-based workflows, and major advances for SPICE, JMAG coupling, and AI-assisted productivity.

Read the full release notes

Download SIMBA 26.03

The fifth preview of the new SIMBA is now available. This preview adds FMU export, chart upgrades, SIMBA Assistant / MCP Server improvements, software update notifications, and more SPICE, memory, and stability work. Download here.

SIMBA Assistant / MCP Server

• Added PDF, image, and text-file attachments in SIMBA Assistant.
• Improved Assistant session UX: cleaner UI, faster tab open/close, and Thinking/Finished state indicators
• Added MCP tools for Assistant session and for Thermal Data

Charts

• Added custom titles for charts and plots
• Added per-plot axis range editing (XMin/XMax/YMin/YMax)
• Improved dual-axis charts with explicit left/right signal assignment and a clearer tree hierarchy
• Preserved the shared X-axis range when adding a plot and its first signal with Auto Scale disabled
• Fixed sampled steady-state signals saved with NumberOfBasePeriodsSaved

Cursors

• Added a signal color dot in Cursor Data rows
• Added full signal-name tooltips in Cursor Data rows
• Added draggable resize for the Signal column

FMU Export

• Added FMU export / generation support
• New FMU (Export) model to package a SIMBA design as an FMI 3.0 Co-Simulation FMU
• Generate FMUs directly from the Property Grid (Build FMU...)

Settings / Updates

• Added software update options in Settings
• Update status now exposes actions to Download, Open Release Note, or Skip Version

SPICE

• Improved SPICE solver

Stability / UX

• Improved low-memory UX with clearer warnings, recovery notices, and better guidance when operations are blocked
• Added further memory-handling improvements in solver/scope allocation
• Fixed another Copy/Paste crash path
• Improved stability
• Fixed title bar menu issues
• Property panel no longer goes empty after a chart/subcircuit breadcrumb round-trip
• CLI startup now supports opening a .jsimba project with -open <filepath>
• Copy/Paste now preserves enabled scopes on thermal power switches, including thermal and control-port scopes

The fourth preview of the new SIMBA is now available. This preview introduces the SIMBA Assistant (with the MCP Server), along with performance gains, stability work (especially around memory), and several UX and chart improvements. Download here.

SIMBA Assistant / MCP Server

• SIMBA Assistant is now available (powered by the MCP Server)
• Added Assistant runtime mode policy: Disabled / MCP Only / SIMBA Assistant
• Offline-mode gating, module availability enforcement, session/startup guards, and a consent dialog
• Updated Assistant/settings UX messages and controls
• Cut/Copy/Paste fixed in SIMBA Assistant

Performance

• ~10% simulation speed improvements

Stability / Memory

• Added memory pressure handling to protect stability during heavy simulations
• Added a status bar memory indicator (warning/critical)
• Blocked new heavy runs when memory is too low, with recovery/cleanup
• Fixed several job/results update crash paths (including duplicate active job entries)
• Improved chart memory-failure handling to avoid hard crashes

Charts

• Sampled signals now render as staircase traces (StepHorizontal) so values are held between sample points
• Fixed DFT of sampled signals

Editing / UX

• CTRL+Drag: fixed random crashes
• CTRL+Drag duplication: fixed multi-selection copy origin (new copies now start next to their source)
• Circuit editor tabs now become persistent on edit
• Prevent duplicate tabs when opening the same design across split docks
• Dark mode: Code Editor errors are visible again
• Keep selection consistent with the active circuit after undo/redo or model refresh

Annotations

• Arrow rendering: fixed shaft-to-head connection; arrowhead size now responds to Width
• Arrow annotation names: kept visible/centered during resize; restored free X/Y name movement (even with zero width/height)

Thermal Data

• Added gate-dependent thermal source

Compatibility / Models

• Python 3.14 compatibility
• Restored support for micro symbols (µ and μ) in expressions/parameters
• Renamed SinusoidalWave to SineWave (with backward-compatible deprecated aliases); updated examples and PSIM mapping
• Updated “DC-DC LLC Converter” example with new PID controllers
• Fixed missing model documentation

JMAG Direct Coupling

• Various improvements

The third preview of the new SIMBA is now available. This preview is mostly focused on bug fixes and stability improvements, with a few UX refinements.

Tutorials

• Model building: Libraries, Custom Libraries, Subcircuits

Charts

• Shared‑X: no extra right axis panel when unused
• AC Sweep: logarithmic scale
• Markers: fixed for sampled signals
• Horizontal zoom: fixed freeze/unresponsive state
• Results rename now updates plot/legend
• Cursor readout matches legend + clearer color identification
• Legend auto‑shows as soon as enough signals are displayed

Cursors

• More compact cursor data rows
• Cursor data tab now sizes to content
• Cursors stay inside zoomed region after re‑enabling

Library

• “Annotation” and “Pins” icons visible again

Misc

• Multi‑User License Watchdog
• Documentation updates (parallel subcircuits + URL)
• ThermalData: SetThermalImpedanceType / GetThermalImpedanceType

Fixes / Stability

• Copy/Paste crash (EnumFormatEtc failed)
• Copy/Paste + Undo/Redo: “Subcircuit definition not found”
• Undo (Ctrl+Z) fixed in floating windows
• Disabled component text stays grey when resizing
• Fixed incorrect window title on new project

Build a simple buck converter in SIMBA to learn model creation, subcircuits, and libraries.

➡️ https://simba.io/doc/tutorials/models_subcircuits_libraries/

The second preview of the new interface of SIMBA is now available. Here are the main changes.

Misc / UX

• Autosave
• Variable File support
• Fixed JMAG-RT WFSM property order
• Added MSVC runtime to SIMBA.UI.Avalonia on Windows
• Keep component names when creating subcircuit
• Added a “Preview” badge in the Title Bar

Charts

• Simplified plot color palette
• Fixed job limit

Demo Mode

• Demo Mode limitations added: Saving project files, Python scripts, Importing/exporting CSV files

Thermal

• DSET: Use dt_e; dt_t to specify fixed thermal simulation time step (fallback: base frequency)
• DSET: Improved Transient Analysis Settings view

Thermal Data

• Fixed dropdown text corruption
• Fixed “Load CSV File” not working

Model

• Power Probe / Power Probe (3 Phase): sampling no longer required; added missing symbol text

Cursor Data

• Fixed scrollbars
• Fixed inability to copy data (delta and others)
• Added P2P metric

Library

• Support Model Drag’n’Drop
• Library management UI fixes
• In subcircuits, “Pins” library is now accessible

Bugs

• Rotate/Flip components while placing
• Keep result TreeView expanded nodes on job list updates
• Improved UI performance when importing large CSV dataset
• Python/Code Editor: Undo/Redo fixed
• Glitch when moving devices fixed
• Unsaved changes tracking fixed when:
  • changing device properties
  • editing code
  • modifying subcircuit content
• After moving devices, cursor returns to initial state
• Repository update reliability improved (script file path)
• Circuit Property Grid no longer shows Circuit Name incorrectly
• Subcircuit Variables fixed

Crash Fixes

• Thermal Data Grid crash
• ACSweep crash when Fmin > Fmax
• UpdateJobs crash: reordering using a jobs list with duplicate references

Feedback and next steps

The next preview will focus on:

• SIMBA Assistant
• Demo Mode
• Charts and results

For feedback or feature requests, contact us at support@simba.io.

A quick walkthrough for new users to open a project, navigate the workspace, and run a simulation.

➡️ Watch it here: https://simba.io/doc/tutorials/interface_project_navigation/

SIMBA is getting a major upgrade, and the public beta ships is now available. This isn’t a redesign: we rebuilt SIMBA from the ground up.

What’s new:

• Cross-platform: Windows, Linux, macOS
• Much faster UI
• Chart engine rewritten from scratch
• Tabbed workflow + optional floating windows for multi-monitor setups
• Embedded Python scripting
• AI Assistant to generate or edit SIMBA scripts from plain English (e.g., “create a sweep of X and plot efficiency vs load”)

SIMBA 25.11 is here!

We're excited to announce the release of SIMBA 25.11, packed with major updates like Non Linear Magnetic Core Model, new power and control models, enhanced SPICE support, and more.

• 👉 Download
• 📘 Read the Release Notes

You can now watch the recordings from the SIMBA 2025 Power Electronics Conference on our dedicated page.

We are pleased to share new SIMBA examples related to the following:

• Three-phase NPC inverter with DQ current control

• Thermal benchmark of 3-Level 3-phase Voltage Source Inverters

We’re excited to share the preliminary program for the SIMBA 2025 Power Electronics Virtual Conference, happening online November 6, 2025 at 2:00 pm CEST.

Highlights include a keynote from the SIMBA team, and sessions from industry and academia on PFC design, nuclear protection studies, microgrids, and more.

• Register now
• Visit the conference page 

We’re launching a first-of-its-kind platform with SIMBA Cloud and SIMBA Online!

SIMBA Online: a no-install, full-featured browser-based power electronics simulator with a rich model library, intuitive circuit editor, and advanced waveform viewer.

SIMBA Cloud: host your projects in the cloud, access them anywhere, and share securely within your organization, or publish publicly. And with the new VIEWER MODE, anybody can open a public project, even without a license.

More info & a quick try

SIMBA 25.06 is here!

We're excited to announce the release of SIMBA 25.06, packed with major updates like JMAG Direct Coupling, new GUI features, enhanced SPICE support, and more.

• 👉 Download
• 📘 Read the Release Notes

Electric motors and inverters are central to modern electrification, making their optimization crucial for efficiency, sustainability, and performance.

Accurately evaluating losses in both components is a key challenge in motor drive design. This webinar demonstrates how the combined use of SIMBA and JMAG provides fast and accurate solutions to these challenges.

• Watch Webinar Recording

Our team will be in Detroit on June 4–5 for the JMAG Annual Conference.

We'll be showcasing the new direct coupling between SIMBA and JMAG that is perfect for anyone looking to perform detailed simulations combining finite element analysis of motors and magnetics with advanced power electronics and control.

If you're attending, please stop by and say hi!

Our partner Reliamotive Labs will showcase SIMBA at the ECCE Asia 2025 conference (11–14 May 2025, Booth A2).

We demonstrated the new features of SIMBA 25.03 , including accelerated Dual-Stage Electro-Thermal Simulation, in a webinar.

• See Recording

SIMBA 25.03 Release!

One of the major features of SIMBA 25.03 is the new Dual-Stage Electro- Thermal Analysis, which speeds up electrothermal simulation by up to 20 times!

• Release Note
• Download

We are thrilled to announce that Reliamotive Labs is now our official distributor for SIMBA in India!

Reliamotive Labs has a strong background in power electronics and a deep understanding of the industry's challenges and needs. With their expertise, we are confident that Indian engineers and researchers will benefit from top-notch local support and a seamless experience with SIMBA.

We released a new application example exploring the Dual Active Bridge (DAB) Converter: Loss Evaluation in a Dual Active Bridge (DAB) Converter

A comprehensive modeling guide for fuel cells has been published on the SIMBA resources platform: Fuel Cell Modeling: implementations and parameter extraction from experimental data.