# FS Adjuvants vs Soil Test Pro

The clearest difference is rating: Soil Test Pro at 3.7 against FS Adjuvants's 3.0. Soil Test Pro also leads on in-app purchases (none vs 1) and update cadence (every 2 months vs every 5 months). FS Adjuvants's advantage is review sentiment (60% vs 43%) and iOS requirement (9.0 vs 15.6). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. FS Adjuvants sells 1 one-off in-app purchase. Soil Test Pro asks for nothing beyond the download.

Soil Test Pro holds the better App Store score, 3.7 against 3.0. Both are backed by a comparable volume of ratings — 6 and 14 respectively. Written reviews complicate that: 60% of FS Adjuvants's written reviews are positive against 43% of Soil Test Pro's, so the app with the better star average is not the one people write more warmly about.

FS Adjuvants ships an update every 5 months, Soil Test Pro every 2 months. The most recent releases landed on September 28, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | FS Adjuvants | Soil Test Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (6 ratings)](https://appshunter.io/ios/app/fs-adjuvants/id428239018/reviews) | **[3.7 (14 ratings)](https://appshunter.io/ios/app/soil-test-pro/id485742991/reviews)** |
| Number of ratings | 6 | **14** |
| Positive reviews | **60.0% of reviews** | 42.9% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 months** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 18 MB | 24 MB |
| Requires iOS | **9.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Precision Laboratories, Inc.](https://appshunter.io/developer/417355584) | [TapLogic, LLC](https://appshunter.io/developer/464313028) |

## What reviewers say

### FS Adjuvants

[App page](https://appshunter.io/ios/app/fs-adjuvants/id428239018)

This app assists agricultural applicators with proper tank mixing sequences for crop protection products. It helps prevent incompatibilities, saves time and money, and maintains accurate spray logs with weather integration to reduce drift risk.

**Highlights:** Tank mixing order guide, Mix Sheets for product use rates, Spray Logs with GPS and weather, Weather Integration for drift reduction, Mixing Precautions alerts, Product database with 1300+ items

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FS Adjuvants Weather Integration | $0.99 | one-time |


### Soil Test Pro

[App page](https://appshunter.io/ios/app/soil-test-pro/id485742991)

Streamline your soil sampling process with this app. It offers GPS field boundary drawing, offline capabilities, and direct integration with leading monitors for fertilizer recommendations and controller files. Access lab results and historical data easily.

**Highlights:** GPS field boundary drawing, Offline work capability, Lab results in 5-7 days, Fertilizer recommendations, Controller file export, Soil testing history, Aerial imagery

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is FS Adjuvants free?

FS Adjuvants is free to download, with in-app purchases available.

### Is Soil Test Pro free?

Soil Test Pro is free to download, with no in-app purchases.

### Which has better reviews, FS Adjuvants or Soil Test Pro?

Soil Test Pro is rated higher. FS Adjuvants averages 3.0 out of 5 from 6 ratings, while Soil Test Pro averages 3.7 from 14 ratings.

### Do FS Adjuvants or Soil Test Pro have ads?

Neither FS Adjuvants nor Soil Test Pro shows ads.

### Which is updated more often, FS Adjuvants or Soil Test Pro?

FS Adjuvants ships an update every 5 months, and Soil Test Pro every 2 months. Most recently, FS Adjuvants was updated on September 28, 2026 and Soil Test Pro on October 9, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*