Terraequil app icon
One-time iPhone and iPad app

Terraequil

Limit-equilibrium screening

Purpose-Built

Transparent slope-stability screening with Fellenius and simplified Bishop slices, circular surface search, groundwater scenarios, reinforcement loads, and sensitivity plots.

Core Features

  • Transparent slice calculations
  • Fellenius and Bishop comparison
  • Groundwater sensitivity plot
  • Local section-photo evidence

Private by Design

No account, subscription, ads, tracking, third-party analytics, or developer-operated backend. Core features work offline, and your work stays on device unless you deliberately share or export it.

Terraequil app interface

Use It Responsibly

Slope results are preliminary screening only. They do not replace subsurface investigation, groundwater assessment, field instrumentation, or a qualified geotechnical engineer.