One model
Every view — text, diagram, CLI, script — reads and writes the same underlying SysML.
Two ways in
Text or canvas: edits sync instantly both ways, keeping identity and layout intact.
Zero translation
No import/export step
between representations.
What you see is the model.
Author
Textual and graphical editors, live projectional editing, kept in sync, with automatic formatting and diagram generation.
Understand
Refactoring, quick fixes, autocompletion, hover docs, navigation, diagnostics, and linting—all model-aware and powered by a full language server over pattern matching.
Verify
Evaluate expressions, propagate constraints, and verify model requirements—with optional Z3/SMT deep reasoning.
Automate
A real terminal: SysML v2 CLI, bash utilities, a REPL, and multi-language scripting for transformations and workflow automation, inside the IDE.
Identity-aware version history for models as graphs.
Every workspace keeps your models, scripts, and data tied together—versioned, referencable, and non-destructive. Where and when you commit is entirely up to you, giving you total ownership and complete peace of mind over your data.
- Linear autosave history.
- Integrated Git management.
- Local Flexo MMS and SysMLv2 Web Service integration with automatic semantic model promotion.
For the engineers who script their workflows.
Underneath the editor, Kotar runs local services: a SysML v2 service, a local Flexo/MMS model repository, an RDF quad store, and a general-purpose SQLite database — inspectable through a table editor, a service explorer, or direct HTTP/API calls.
- Local SysML v2 service
- Local Flexo/MMS service
- RDF quad store · SQLite database
- Table editor
- Service explorer with logs
- HTTP/API interaction
Your engineering data doesn’t start in SysML.
It doesn’t have to end there either.
Replace fragile import/export scripts with an SDK framework for Data and Service Bindings. Preview staged changes, track full provenance, and keep models automatically synchronized.
Start on your laptop. Connect to enterprise when you’re ready.
Kotar runs entirely in the browser — no IT stack required. When you're ready, point it at your enterprise Flexo instance and GitHub/GitLab. Nothing about the model changes in between.
Laptop
Web Browser
Kotar
Source Control
Transformation Engine
Graphical Editor
OpenMBEE
local Flexo
Local File System Access
Textual Editor
SysML v2 linter
OpenMBEE SysML v2 Kernel
Enterprise IT Infrastructure
OpenMBEE Remote Enterprise Flexo Optional – Enterprise Edition
github/gitlab
Textual model repository
WebIDE application delivery
Watch Kotar in action.
Source Control Demo - Web IDE
Integrate Flexo into the Web IDE with unified source control across Git, SysML v2, and local autosaves.
Requirements Demo - SysMLv2 Web IDE
Set up and manage a transform pipeline for ingesting requirements data into a SysMLv2 model.
One engine, everywhere in the IDE.
The text editor, the graphical canvas, the CLI, and every automation script all run against the same SysML v2 SDK. One semantic model, no format drift, no synchronization guesswork between tools. It's a small idea with a bigger implication: when your models speak one language inside Kotar, they're that much closer to speaking to everyone else's, too.
Read before you model. Or after. Either works.
Every capability in Kotar is documented — from your first model to your deployment pipeline.
Open user manual
Start modeling with Kotar.
Free to run, wherever you run it.