# Spread Test Calculator — Calculate SGN and UI values

> Calculate SGN and UI values (iPhone/iPad app by Brian Dockerty.)

- Source: https://appshunter.io/ios/app/spread-test-calculator/id6744341834 (this page in markdown: same URL + `.md`)
- Developer: [Brian Dockerty](https://appshunter.io/developer/1370231043)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 11.0 · 25 MB
- Languages: American English
- Released: 2025-04-13
- Data updated: 2026-05-16
- User reviews in markdown: https://appshunter.io/ios/app/spread-test-calculator/id6744341834/reviews.md

## What is Spread Test Calculator?

Calculates the SIZE GUIDE NUMBER and UNIFORMITY INDEX value from the results of your standard fertiliser sieve.
This is used to determine the characteristics of your fertiliser.


## Version history (last 2 releases)

### 1.0.3 — 2025-12-13

Updated for age compliance rules.

### 1.0 — 2025-04-14

No release notes.

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## More apps by Brian Dockerty

- [SCL Network Control](https://appshunter.io/ios/app/scl-network-control/id1370231044)
- [SCL Bluetooth Commander](https://appshunter.io/ios/app/scl-bluetooth-commander/id1489372909)
- [Boltac Stirrer Commander](https://appshunter.io/ios/app/boltac-stirrer-commander/id1527365182)
- [JWE V3 Plus Scales](https://appshunter.io/ios/app/jwe-v3-plus-scales/id6448711128)
- [RandleSimulation](https://appshunter.io/ios/app/randlesimulation/id6753091164)

All apps by Brian Dockerty: https://appshunter.io/developer/1370231043

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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 2026-05-16.*