Download centre

Get Tractrix.

Download Tractrix for QGIS, AutoCAD and Revit with an email-verified account. Choose your package below and sign in to access the download centre. Public registration is open. Verification email delivery is currently limited; account verification may be delayed. No marketing opt-in is required.

Products

Desktop GISStable

Tractrix for QGIS

Aircraft swept paths, pushback, turning, jet blast, stands, fillets, separation and GSE in QGIS.

Version: 0.2.1
Released: 2026-10-02
Platform: Windows, macOS, Linux
Requires: QGIS 3.34 LTR or later, including QGIS 4.x (Qt5 or Qt6)
No additional Python packages
Licence: GPL-2.0-or-later (free)
SHA-256: 74da12a4c728fcb37a8c440125ad6d7ab4dc1cc0cd5b54195f3a83398d86724f

Install steps

In QGIS open Plugins → Manage and Install Plugins → Install from ZIP.
Select the downloaded ZIP and choose Install Plugin.
Open Processing → Toolbox → Tractrix, or use the Tractrix menu and toolbar.

Web platformPreview

Tractrix Cloud

Upload a GeoJSON or DXF drawing, run simulations in the browser, share results with your organisation and automate with the REST API.

Request early access Cloud manual

Version: Preview
Released: Early access
Platform: Any modern browser (Chrome, Edge, Firefox, Safari)
Requires: A Tractrix account (e-mail verification required)
Drawings in GeoJSON or DXF, planar metres
Licence: Hosted service (see Terms). Engine: GPL-2.0-or-later
SHA-256: published with the release

Install steps

Nothing to install. Sign up, verify your e-mail and create an organisation.
Create a project and upload a drawing.
For CAD or scripts, create an API token under Organisation → API tokens.

Access to the hosted preview is by invitation while the service is evaluated.

CAD add-inBeta

Tractrix for AutoCAD

TX commands that simulate on your DWG and draw envelopes, tracks, footprints and issues on TX-* layers. Runs the engine locally or in Tractrix Cloud.

Version: 1.0.0
Released: 2026-10-02
Platform: Windows 10/11 (x64)
Requires: AutoCAD 2025 (.NET 8)
Tractrix Cloud API token, or a separately installed local engine
Licence: GPL-2.0-or-later
SHA-256: 433da6d8dcf3bdd5101d0ded85f763e0f1bfa627cd8d99b4a5f54810da66d3e2

Install steps

Close AutoCAD. Extract Tractrix.bundle into %AppData%\Autodesk\ApplicationPlugins.
Start AutoCAD. The Tractrix ribbon tab appears; type TXSETTINGS to choose the local or cloud engine.
Run TXLIBRARY to check the engine responds.

442 client and real-engine tests passed. Autodesk Windows host validation remains required. This package does not include the Windows engine executable.

BIM add-inBeta

Tractrix for Revit

The same TX commands inside Revit: swept paths and clearance envelopes as detail geometry in plan views, with the local or cloud engine.

Version: 1.0.0
Released: 2026-10-02
Platform: Windows 10/11 (x64)
Requires: Revit 2025 (.NET 8)
Tractrix Cloud API token, or a separately installed local engine
Licence: GPL-2.0-or-later
SHA-256: d219ba50c12225071177384aa2dd5f2f52b9634824d058fe1fbbd92692c68fc3

Install steps

Close Revit. Extract Tractrix.addin and the Tractrix folder into %AppData%\Autodesk\Revit\Addins\2025.
Start Revit and allow the Tractrix add-in when prompted.
Open a plan view and run Tractrix → Settings to choose the engine.

442 client and real-engine tests passed. Autodesk Windows host validation remains required. This package does not include the Windows engine executable.

Release channels

Stable for projects. Beta for what is next.

Stable releases are provided through your verified account, with a published checksum for each package.

Beta and preview builds carry new products and features before they are stable. Commands, parameters and layer names may still change, and results should be cross-checked. Report anything unexpected through the help centre.

Versions follow MAJOR.MINOR.PATCH. The tractrix/1 protocol is versioned separately: additive fields do not change it; renaming or removing a field requires tractrix/2.

Verify a download

Compare the SHA-256 checksum of the file you downloaded with the value published on the release page and in this download centre.

# Windows (PowerShell)
Get-FileHash .\tractrix-file.zip -Algorithm SHA256

# macOS
shasum -a 256 tractrix-file.zip

# Linux
sha256sum tractrix-file.zip

If the values differ, do not install the file. Download it again from your account and contact support if the checksum still differs.

System requirements

What each product needs.

The QGIS plugin needs nothing beyond QGIS. The CAD add-ins require a Cloud API token or a separately installed local engine. They run on Windows hosts.

**Table 1** System requirements.
Product	Host	Operating system	Engine
Tractrix for QGIS	QGIS 3.34 LTR to 4.x (Qt5 or Qt6)	Windows, macOS, Linux	Built in
Tractrix for AutoCAD	AutoCAD 2025 or later	Windows 10/11 x64	Cloud token or separately installed local engine
Tractrix for Revit	Revit 2025 or later	Windows 10/11 x64	Cloud token or separately installed local engine
Tractrix Cloud	Current Chrome, Edge, Firefox or Safari	Any	Hosted
OpenAirside engine	Python 3.9+, shapely 2, numpy	Windows, macOS, Linux	—

Licence

Software licences.

Tractrix for QGIS, the OpenAirside engine and the CAD add-ins are licensed under the GNU General Public License, version 2 or (at your option) any later version. You may use them for any purpose, including commercial projects, study and modify them, and redistribute them under the same licence.

Tractrix Cloud is a hosted service governed by the terms of service. Third-party components are listed under licences.

Older versions

Your account lists the releases currently available for download. Earlier release notes are included below for reference.

0.2.0 — Tractrix brand: new icon, menu, provider and report styling (algorithm IDs unchanged: openairside:*). Headless engine and tractrix/1 protocol shared with the AutoCAD, Revit and Cloud products.
0.1.0 — First release: path, pushback/tow, turning, jet blast, stands, fillets, separation, GSE, libraries.