# Terraequil: Slope Lab — Limit-equilibrium screening

> Limit-equilibrium screening (iPhone/iPad app by Robert Corbin.)

- Source: https://appshunter.io/ios/app/terraequil-slope-lab/id6792825913 (this page in markdown: same URL + `.md`)
- Developer: [Robert Corbin](https://appshunter.io/developer/1890247992)
- Category: Utilities, Education
- Price: $3.99
- Age rating: 4+
- Requires: iOS 17.0 · 90 MB
- Released: 2026-07-30
- Data updated: 2026-08-11
- User reviews in markdown: https://appshunter.io/ios/app/terraequil-slope-lab/id6792825913/reviews.md

## What is Terraequil?

Terraequil: Slope Lab is a focused, fully on-device app. Transparent slope-stability screening with Fellenius and simplified Bishop slices, circular surface search, groundwater scenarios, reinforcement loads, and sensitivity plots.

KEY FEATURES
- Transparent slice calculations
- Fellenius and Bishop comparison
- Groundwater sensitivity plot
- Local section-photo evidence
- Editable sample data and CSV import
- Side-by-side scenario comparison
- Local PDF evidence export
- Fifty-three original offline reference plates

ONE-TIME AND PRIVATE
- One paid download; no subscription or in-app purchase
- No account, advertising, analytics, tracking, or developer-operated backend
- Core features and bundled content work offline
- Work remains on device unless you deliberately share or export it through an Apple system interface

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


## Version history (last 1 release)

### 1.0 — 2026-07-30

No release notes.

## More apps by Robert Corbin

- [Daily Word Journey](https://appshunter.io/ios/app/daily-word-journey/id6761548266)
- [Hush Secret Text](https://appshunter.io/ios/app/hush-secret-text/id6761658175)
- [Renew Guard](https://appshunter.io/ios/app/renew-guard/id6761755447)
- [Receipt to PDF](https://appshunter.io/ios/app/receipt-to-pdf/id6761782025)
- [Route Your Pay](https://appshunter.io/ios/app/route-your-pay/id6761783719)
- [Tip Arbiter](https://appshunter.io/ios/app/tip-arbiter/id6761786879)

All apps by Robert Corbin: https://appshunter.io/developer/1890247992

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-11.*