# Spray Guide vs Fertilizer Calc App

The clearest difference is rating: Spray Guide at 3.0 against Fertilizer Calc App's 1.0. Spray Guide also leads on monetization model (free vs free with in-app purchases) and ratings volume (3 vs 1). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Spray Guide sells 1 one-off in-app purchase and Fertilizer Calc App sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

Spray Guide holds the better App Store score, 3.0 against 1.0. Both are backed by a comparable volume of ratings — 3 and 1 respectively.

Spray Guide ships an update every 3 months, Fertilizer Calc App every 2 months. The most recent releases landed on October 2, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | Spray Guide | Fertilizer Calc App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (3 ratings)](https://appshunter.io/ios/app/spray-guide/id539618335/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/fertilizer-calc-app/id1450299266/reviews) |
| Number of ratings | **3** | 1 |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 19 MB | 18 MB |
| Requires iOS | **10.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Precision Laboratories, Inc.](https://appshunter.io/developer/417355584) | [Alberto Giambone](https://appshunter.io/developer/1412648174) |

## What reviewers say

### Spray Guide

[App page](https://appshunter.io/ios/app/spray-guide/id539618335)

This app helps agricultural professionals ensure crop protection products are mixed in the correct sequence for safe and effective application. It also maintains detailed spray logs compliant with Worker Protection Standards, including weather and location data.

**Highlights:** Recommended mixing order, Mix sheets for accurate loading, Comprehensive spray logs, EPA Number & Re-entry Interval tracking, Nozzle selection for compliance, Favorite products for quick access

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Spray Guide Weather Integration | $5.99 | one-time |


### Fertilizer Calc App

[App page](https://appshunter.io/ios/app/fertilizer-calc-app/id1450299266)

This app helps farmers precisely calculate fertilization needs for their crops. Users can input field details, set fertilization targets for key nutrients like N, P, and K, and determine the required application rates per hectare. It also supports custom area units for flexible calculations.

**Highlights:** Calculate N, P, K, MG, CA needs per field, Set fertilization targets, Determine Kg/Ha for each element, Add custom area units, Supports multiple custom units with Pro membership

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Custom Area Unit | $1.99 | per month |
| Custom Area Unit | $9.99 | per year |


## Frequently asked questions

### Is Spray Guide free?

Spray Guide is free to download, with in-app purchases available.

### Is Fertilizer Calc App free?

Fertilizer Calc App is free to download, with in-app purchases available.

### Which has better reviews, Spray Guide or Fertilizer Calc App?

Spray Guide is rated higher. Spray Guide averages 3.0 out of 5 from 3 ratings, while Fertilizer Calc App averages 1.0 from 1 ratings.

### Do Spray Guide or Fertilizer Calc App have ads?

Neither Spray Guide nor Fertilizer Calc App shows ads.

### Which is updated more often, Spray Guide or Fertilizer Calc App?

Spray Guide ships an update every 3 months, and Fertilizer Calc App every 2 months. Most recently, Spray Guide was updated on October 2, 2026 and Fertilizer Calc App on October 18, 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.*