The HydroBuddy Android app is a complete recoding and port of the popular hydroponic nutrient calculator, HydroBuddy. It contains NO ADS and NO IN-APP PURCHASES.

You can use this calculator to figure out how to combine raw fertilizer salts in order to arrive at a desired concentration of nutrients in a hydroponic nutrient solution. Use it to prepare nutrient solutions by direct addition or to prepare A/B concentrated stock solutions that are then diluted for plant use. For more information or paid support, please visit my website at https://scienceinhydroponics.com.

App is open source, source is available on github at https://github.com/danielfppps/hydrobuddy_android . Check the source yourself. No paid content, no ads, no malware, no spyware.