Aqulator is an aquarium calculator and tank-management app for iPhone and Android, designed to help fishkeepers make informed decisions and keep track of aquarium care. It supports freshwater, saltwater, and pond systems, with calculators for chemical dosing, tank volume, substrate, and weight. Users can check stocking limits and fish compatibility, plan a tank before buying, and track water parameters over time to spot potential problems early. The app also offers tank ratings, test logging, reminders for water changes, and backup and export features.

Aqulator’s plans vary by the number of tanks, reminders, species, and chemical products available, as well as access to test-strip scans and tank-planning tools. The free plan includes core calculators and supports two tanks. A monthly Lite plan adds expanded limits and selected scanning and planning features. The one-time Pro purchase provides unlimited tanks, reminders, scans, ratings, and tank plans. Aqulator is intended to replace guesswork with practical tools for managing aquarium routines.