# NPK Calculator vs Egrowr

The clearest difference is price: Egrowr at Free against NPK Calculator's $2.99. Egrowr also leads on iOS requirement (9.0 vs 18.5). NPK Calculator's advantage is update cadence (monthly vs every 9 months). On ads, in-app purchases and device support there is nothing between them.

Egrowr is free to download; NPK Calculator costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

NPK Calculator ships an update monthly, Egrowr every 9 months. The most recent releases landed on November 1, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | NPK Calculator | Egrowr |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[3.3 (8 ratings)](https://appshunter.io/ios/app/npk-calculator/id988554060/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | 33.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 9 months |
| Monetization | Paid | — |
| Size | 3 MB | 47 MB |
| Requires iOS | 18.5 | **9.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Anton Simonov](https://appshunter.io/developer/988554059) | [Wamron Sp. z o.o.](https://appshunter.io/developer/1464000147) |

## What reviewers say

### NPK Calculator

[App page](https://appshunter.io/ios/app/npk-calculator/id988554060)

This app helps optimize fertilizer solutions for plants by calculating the correct ratios of macronutrients and micronutrients. It aims to save money, prevent nutrient imbalances, and improve nutrient uptake for healthier plant growth in hydroponics or soil.

**Highlights:** Optimizes macronutrient and micronutrient ratios, Database of fertilizers, Nutrition programs from experienced growers, Saves money on fertilizer solutions, Prevents fertilizer burns and nutrient lock-out, Optimizes nutrient uptake

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

**In-app purchases:** none


### Egrowr

[App page](https://appshunter.io/ios/app/egrowr/id1464000148)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is NPK Calculator free?

NPK Calculator costs $2.99, with no in-app purchases.

### Is Egrowr free?

Egrowr is free to download, with no in-app purchases.

### Do NPK Calculator or Egrowr have ads?

Neither NPK Calculator nor Egrowr shows ads.

### Which is updated more often, NPK Calculator or Egrowr?

NPK Calculator ships an update monthly, and Egrowr every 9 months. Most recently, NPK Calculator was updated on November 1, 2026 and Egrowr on October 26, 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.*