NPK Calculator vs Egrowr
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
NPK Calculator
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.
- 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
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Living beings such as plants require a proper balance, especially of nutrients, for optimal growth. Essential nutrients are necessary for basic functions, and trace nutrients for the best health. Nutrient lock-out can occur when the pH is out of balance or when there is too much of a nutrient. Even if overdosing doesn't occur, nutrients can be wasted by adding too much solution per fertilizing cycle. NPK Calculator is an app for optimizing the ratio of macronutrients and micronutrients in your fertilizer solution for use in hydroponics or soil. Our in-app database contains many simple and complex fertilizers in the market. Several nutrition programs by knowledge growers with long-term experience are available in preset tabs. -Save money on fertilizer solution (up to 50%) -Know the ratio of elements available in your solution -Prevent fertilizer burns and nutrient lock-out -Optimize nutrient uptake
Egrowr
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Follow your plants with real-time data, push notifications, graphs and control pumps & relays. This app can connect directly to any Egrowr devices through WiFi network as well as through a Cloud server from anywhere in the world.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | NPK Calculator | Egrowr |
|---|---|---|
| Price | $2.99 | Free — better |
| Rating | 3.3 (8 ratings) — better | — |
| Positive reviews | 33.3% of reviews | — |
| Number of ratings | 8 — better | — |
| Update frequency | Monthly — better | Every 9 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 18.5 | 9.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 47 MB |
| Age rating | 4+ | 4+ |
| Developer | Anton Simonov | Wamron Sp. z o.o. |
In-app purchases
NPK Calculator
No in-app purchases
Egrowr
No in-app purchases
