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The Heart Sparks app is your smart casting powder calculator and personal digital mold library all in one.

Calculate the perfect amounts for your casting projects in seconds and permanently save your custom shapes, mixing ratios, and notes directly on your device. No matter which casting powder you use, get the most out of your hobby and cast perfect shapes!

YOUR FEATURES:

YOUR MOLD LIBRARY: Save your favorite shapes directly in the app. Add your own photos (via camera or gallery), notes, and categories to never lose track again.

PRECISE MIXTURE CALCULATOR: Simply enter the water volume of your mold and your desired mixing ratio (e.g., 1:3). The app instantly shows you, down to the gram, exactly how much casting powder and liquid (water or Heart Sparks) you need to mix.

ZERO WASTE MODE: Have some Heart Sparks left over? No problem! Simply enter the weight of your remaining Spark Flow, and the app will tell you exactly how much casting powder you need to add to use up all the material.

PRO TIP INTEGRATED: Do you use Spark Flow instead of water? If desired, the app automatically calculates the proven Spark Flow additive (+3g extra per 100g casting powder) and adds it directly to the total amount.

SHARE WITH FRIENDS: Export your custom measurements, including a photo, with just one click to share them with the crafting community.

DATA BACKUP: Since everything is stored locally, you can easily create and save backups of your personal mold library at any time.

Get the most out of your hobby, avoid unnecessary waste, and cast perfect shapes with Heart Spark!

YOUR DATA BELONGS TO YOU: All calculations and molds are stored 100% locally on your device. No cloud required, no registration, no account creation—simply open the app and start immediately, completely offline!

Premium Upgrade (Heart Spark Pro):

Unlock the storage limit and save an unlimited number of shapes in your library. Choose flexibly between a monthly or annual subscription (cancel anytime).