# Spray Guide vs NPKalc

The clearest difference is rating: NPKalc at 4.6 against Spray Guide's 3.0. NPKalc also leads on ratings volume (16 vs 3). Spray Guide's advantage is iOS requirement (10.0 vs 17.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Spray Guide sells 1 one-off in-app purchase and NPKalc sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

NPKalc holds the better App Store score, 4.6 against 3.0. That said, the two scores are not equally well evidenced: NPKalc has 16 ratings behind it against 3, so its average is the more settled of the two.

## The numbers

| Metric | Spray Guide | NPKalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (3 ratings)](https://appshunter.io/ios/app/spray-guide/id539618335/reviews) | **[4.6 (16 ratings)](https://appshunter.io/ios/app/npkalc-fertilizer-calculator/id6497334549/reviews)** |
| Number of ratings | 3 | **16** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | — |
| Monetization | Free | Free |
| Size | 19 MB | 8 MB |
| Requires iOS | **10.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Precision Laboratories, Inc.](https://appshunter.io/developer/417355584) | [Barton Cone](https://appshunter.io/developer/1332401339) |

## 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 |


### NPKalc

[App page](https://appshunter.io/ios/app/npkalc-fertilizer-calculator/id6497334549)

This app helps calculate fertilizer needs for various applications, supporting both granular and liquid types with flexible unit inputs. It's designed for anyone managing lawns, gardens, or larger agricultural areas.

**Highlights:** Granular fertilizer calculation, Liquid fertilizer calculation, Supports various units of measure, Ideal for DIY lawn care, Useful for professionals

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| NPKalc Pro | $4.99 | one-time |


## Frequently asked questions

### Is Spray Guide free?

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

### Is NPKalc free?

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

### Which has better reviews, Spray Guide or NPKalc?

NPKalc is rated higher. Spray Guide averages 3.0 out of 5 from 3 ratings, while NPKalc averages 4.6 from 16 ratings.

### Do Spray Guide or NPKalc have ads?

Neither Spray Guide nor NPKalc shows ads.

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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.*