Physics-based force calculation for tree rigging.
See the load on every pulley in real time,
and review the estimated loads before the work starts.
✓ Android | ✓ Japanese / English / Spanish | ✓ Works offline
Field experience meets physics. Accurate force calculation makes the loads in a rigging setup visible,
so you can assess a plan before anyone leaves the ground.
From a single block to redirects with two or three pulleys. Loads are calculated in real time from the rigging geometry using F = 2T × cos(θ/2) and related formulas.
Japanese, English and Spanish interface. Switch between metric (kg/N) and imperial (lbs/lbf) units at any time. Built for crews anywhere in the world.
Proportional load arrows (100 kg displayed load = 100 px), tree background images and color coding show at a glance where the load goes and help you assess the setup.
Estimate the weight of a limb or log from its diameter, length and species. Eight species presets help you choose the right rigging point for the piece.
Save the weight-calculation settings (species and dimensions) you use most, and get the numbers for your usual trees in seconds.
No internet connection is needed after installation. Reception on site does not matter: run your load calculations anytime, anywhere.
Plan the job in the office using a photo of the real tree.
"This site, this tree, this system - what happens?" becomes obvious at a glance.
▲ Real example
Loads at three rigging points calculated and visualized on a site photo
Included in the Pro app since V2.0.0. Watch the load move between two winch systems as you operate them.
This module is still being refined, and improvements continue.
As the load is handed over from the existing system to the new one, the simulator shows in real time how the force on each system changes. "How far can I pay out, and how much load ends up on which system?" can be examined before the job.
Note: this module includes features that are still in development. Improvements continue.
▲ Actual screen
Load transfer between two winch systems, with the share carried by each
| Version | App 2.3.0 (Rigging Point Load Simulator V1.1.0 / Load Transfer Simulator v1.0.0-rc2) |
| OS | Android 6.0 or later |
| Storage | Approx. 5 MB (app itself) |
| Network | Needed only for installation; works offline afterwards |
| License | Google Play license (usable on the devices signed in to your Google account) |
The Android app is available on the Google Play Store.
Choose the Pro version or try the free version first.
The full version. Load values for every rigging point, detailed force analysis, the tree weight calculator, unlimited custom presets, and the Load Transfer Simulator.
A separate free app for learning the basics. Place rigging points 1 to 3 and watch the load flow. Load values are shown for rigging point 1 only; the full numbers are in the Pro version.
Closed testing has ended and the Pro app is released on Google Play. Former closed-test participants can keep using it; no additional steps are required.
Yes. When you get the app from the Google Play Store, you can install it on the devices signed in to your own Google account.
Only for downloading and installing the app. After installation it works completely offline, so poor reception on site is not a problem.
Currently only the Android version is available. An iOS version is under consideration. The Android version can be downloaded directly from the Google Play Store.
No. Closed-test participants can keep using the released version. No additional steps are required.
Yes, support is provided by email. Feel free to contact us with questions about how to use the app.
For questions about JTW Tree Rigging Simulator Pro, please contact us by email.