Fertilizer Calc App vs SOS Viewer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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.
SOS Viewer
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Smart Orchard System (Viewer) is a user-friendly app designed for durian tree investors and enthusiasts. It allows users to effortlessly monitor and access detailed information about the health, growth, and status of their durian trees in real time. With its intuitive interface, you can track tree conditions, review investment performance, and explore key orchard data with ease. Stay informed and ensure your durian investments thrive with Smart Orchard System (Viewer) —your smart solution for smarter farming.
Screenshots
Verdict
The clearest difference is in-app purchases: SOS Viewer at none against Fertilizer Calc App's 2. SOS Viewer also leads on update cadence (fortnightly vs every 2 months). On price, ads, device support and iOS requirement 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
Both are free to download. Fertilizer Calc App sells 2 in-app purchases, starting at $1.99 per month. SOS Viewer asks for nothing beyond the download.
Fertilizer Calc App ships an update every 2 months, SOS Viewer fortnightly. The most recent releases landed on October 18, 2026 and October 15, 2026 respectively.
| Parameter | Fertilizer Calc App | SOS Viewer |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 2 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 16.0 | 15.6 — better |
| Further details — not scored | ||
| Size | 18 MB | 66 MB |
| Age rating | 4+ | 4+ |
| Developer | Alberto Giambone | Tech Tree Sdn Bhd |
In-app purchases
Fertilizer Calc App
- Custom Area Unit$1.991 Month
- Custom Area Unit$9.991 Year
SOS Viewer
No in-app purchases
Questions
Is Fertilizer Calc App free?
Is SOS Viewer free?
Do Fertilizer Calc App or SOS Viewer have ads?
Which is updated more often, Fertilizer Calc App or SOS Viewer?
Other comparisons
