# Quadratline: Field Ecology — Quadrats, transects, diversity

> Quadrats, transects, diversity (iPhone/iPad app by Robert Corbin.)

- Source: https://appshunter.io/ios/app/quadratline-field-ecology/id6792826811 (this page in markdown: same URL + `.md`)
- Developer: [Robert Corbin](https://appshunter.io/developer/1890247992)
- Category: Education, Productivity
- Price: $2.99 (on sale, was $3.99)
- Age rating: 4+
- Requires: iOS 17.0 · 88 MB
- Released: 2026-07-30
- Data updated: 2026-09-10
- User reviews in markdown: https://appshunter.io/ios/app/quadratline-field-ecology/id6792826811/reviews.md

## What is Quadratline?

Quadratline: Field Ecology is a focused, fully on-device app. Offline ecological survey notebook with custom quadrats and transects, abundance/cover records, Shannon and Simpson diversity, occupancy, rarefaction, GPS notes, and CSV export.

KEY FEATURES
- Custom quadrat and transect records
- Diversity and density metrics
- CSV/PDF field handoff
- Local photos and site coordinates
- 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

Community metrics depend on sampling design and identification quality. Follow the protocol, taxonomy, permits, regional references, and agency or research requirements for the project.


## 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

---

*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 2026-09-10.*