# Gradalith: Soil Lab — Gradation and USCS workspace

> Gradation and USCS workspace (iPhone/iPad app by Robert Corbin.)

- Source: https://appshunter.io/ios/app/gradalith-soil-lab/id6792647222 (this page in markdown: same URL + `.md`)
- Developer: [Robert Corbin](https://appshunter.io/developer/1890247992)
- Category: Utilities, Education
- Price: $2.99 (on sale, was $3.99)
- Age rating: 4+
- Requires: iOS 17.0 · 79 MB
- Released: 2026-07-29
- Data updated: 2026-09-08
- User reviews in markdown: https://appshunter.io/ios/app/gradalith-soil-lab/id6792647222/reviews.md

## What is Gradalith?

Gradalith: Soil Lab is a geotechnical field companion for plotting grain-size distributions, calculating gradation coefficients, and organizing repeatable soil-classification work.

KEY FEATURES
- Sieve and hydrometer gradation workspace
- Semi-log D10, D30, and D60 interpolation
- Uniformity and curvature coefficients
- Atterberg limits and plasticity cues
- Transparent USCS decision support
- Editable sample records plus CSV import
- Scenario comparison and plotted curve
- Local PDF analysis packet
- Forty original offline soil-lab 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 tools and bundled reference material work offline
- Work remains on device unless you deliberately import, share, or export through an Apple system interface

Classifications are field and study aids, not a stamped geotechnical opinion. Follow project specifications, laboratory procedures, and qualified engineering review.


## 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 2026-09-08.*