NPK Calculator
PWA nutrient-solution calculator for farmers
A professional tool that lives in growers’ pockets: precise nutrient-solution math without spreadsheets, formulas or the risk of losing a batch to a milligram error.
The problem
Fertilizer math is a critical operation: concentrations, volumes, converting NPK to a specific solution. A mistake costs the harvest. For a beginner it’s a barrier; for a pro, routine best offloaded to a reliable tool.
What the calculator does
- A solution for the crop and stage - the calculator computes the nutrient solution by crop and growth stage. No tables, no manual conversions.
- Works offline - it’s a PWA: installs on the phone like an app and calculates right in the greenhouse, even with no signal.
- PRO version - advanced scenarios for those already growing at volume.
- Passwordless sign-in - a one-time link in Telegram. Nothing to remember, nothing to reset.
- Private analytics - the product evolves on anonymous statistics, without collecting personal data.
Stack
PWA (service workers, offline), WordPress REST, Telegram Bot API, passwordless auth.