GroundLoop: Grounding Tests

Earth & ground resistance test

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

Wenner readings to soil resistivity, rod sizing to your 25-ohm target, plus a fall-of-potential layout that flags a bad test. Fully offline. No account, no subscription. GroundLoop is the grounding field companion for electrical engineers, contractors, and tower techs — fully offline, no account, no subscription. SOIL RESISTIVITY Enter Wenner four-pin or Schlumberger readings and get apparent resistivity per spacing instantly, with probe-depth correction, anomaly flags for layered soil, and a resistivity-vs-spacing curve you can read at the truck. ELECTRODE ESTIMATES Size a single rod, a multi-rod array, or a grid (Sverak screening formula) and compare against your target — 25 ohms (NEC 250.53), 5 ohms, or a custom spec. Every result shows the formula reference it came from. FALL-OF-POTENTIAL TESTS Enter your current-probe distance and GroundLoop lays out the 52/62/72% voltage-probe positions, then checks your three readings for a valid plateau — so a bad test gets caught in the field, not back at the office. FIELD REPORTS Export a clean PDF per site: resistivity tables, electrode estimates with formula references, fall-of-potential records, and date — ready for your project file. FREE TO TRY One site with every tool unlocked, reports watermarked. One-time purchase removes the watermark and the site limit. No subscription, ever. GroundLoop is a field calculation and recording aid. It encodes textbook formulas with cited references (values pending professional-engineer review are labeled in-app); it is not a substitute for a licensed PE's design, the governing standard, or required field verification.

Ratings & Reviews

  • This app hasn’t received enough ratings or reviews to display an overview.

The developer, 毅 王, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    • 毅 王
    Size
    • 2.1 MB
    Category
    • Productivity
    Compatibility
    Requires iOS 17.0 or later.
    • iPhone
      Requires iOS 17.0 or later.
    • Mac
      Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
    Languages
    • English
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    • © 2026 Yi Wang
  • Developer Website
  • Privacy Policy

    • More by 毅 王