Comparison

Spray Guide vs Fertilizer Calc App

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Spray Guide

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
Read full description

Spray Guide, from Plant Health Technologies, is an environmental stewardship app. It helps ensure applicators are mixing crop protection products in the proper sequence for uniform and safe applications. Following the proper mixing, sequence helps prevent product incompatibilities and can save applicators time and money by avoiding product loss and sprayer clean-out problems. Spray Guide also captures product use rates and application information and conveniently maintains comprehensive, accurate Spray Logs for easy record keeping, which are compliant with Worker Protection Standards. Records can also include local weather, nozzle used and GPS field location. KEY FEATURES • Mix Guide: receive a recommended mixing order based on the products selected • Mix Sheets: capture field size, spray volume, tank size and product use rates and receive per tank and per field volume requirements for accurate loading and easy documentation and compliance. • Spray Logs: allow you to conveniently record GPS location, time spent spraying and weather details. A notes section also allows for additional record keeping • EPA Number & Re-entry Interval: allows for compliance with Worker Protection Standards Nozzle Selection: enhances records for label compliance My Favorites: select your most-used products for easy access

About

Fertilizer Calc App

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
Read full description

Take control of every element of fertilization. Add Fields -> Set Fertilization Target -> Add fertilization you can take control of N, P, K, MG, CA. for every field, setting the target and see how may Kg/Ha of every element your crops need. You deserve a custom area unit? No problem! just add your custom area unit in square meters (es. Acre = 4046) and Fertilizer Calc does the conversione for you. You can add multiple custom unit with pro membership.

Screenshots

Spray Guide4 screens
Fertilizer Calc App4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
Spray Guide versus Fertilizer Calc App: the parameters behind the verdict, then further details
ParameterSpray GuideFertilizer Calc App
PriceFreeFree
Rating3.0 (3 ratings) — better1.0 (1 ratings)
Positive reviews—0.0% of reviews
Number of ratings3 — better1
Update frequencyEvery 3 monthsEvery 2 months — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPodiPhone, iPad
Requires iOS10.0 — better16.0
Further details — not scored
Size19 MB18 MB
Age rating4+4+
DeveloperPrecision Laboratories, Inc.Alberto Giambone

Customer experience

Spray Guide

All ratings3 ratings
Positive33.3%
Neutral33.3%
Negative33.3%

Fertilizer Calc App

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews2 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

1 purchases

Spray Guide

One-time1
  • Spray Guide Weather Integration$5.99
2 purchases

Fertilizer Calc App

Subscriptions2
  • Custom Area Unit$1.991 Month
  • Custom Area Unit$9.991 Year

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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