About
Aqulator is a comprehensive aquarium tool available as a free Android app and web-based calculator suite, designed for freshwater, saltwater, and pond hobbyists at every level. It eliminates the guesswork from aquarium keeping by providing a full library of precise calculators — including chemical dosing for 470+ products, stocking assessments with bioload analysis, CO2 for planted tanks, substrate depth, heater wattage, water change volumes, and unit conversions across imperial and metric systems. Beyond calculators, the app offers robust tank management features: a personalized dashboard with at-a-glance reminders and latest parameters, a parameter logger to track water chemistry trends and catch problems early, automated dosing reminders calibrated to your exact tank size, and a complete calculation history so you can reference or rerun past results without re-entering data. The free tier supports up to two tanks, 150 fish species, 154 chemical products, and most calculators — more than enough for a one- or two-tank setup. Pro ($9.99, one-time purchase, no subscription) unlocks unlimited tanks and reminders, all 257 fish species, all 471 chemical products, a fish recommender, an aquarium planner, CSV data export, and cross-device sync. No signup is required to use the free web calculators, making Aqulator accessible to anyone who needs a quick answer.
Key Features
- Chemical Dosing Calculator: Enter your tank volume and product to get exact dosing measurements for 470+ freshwater and saltwater chemicals, complete with safety warnings.
- Stocking Calculator: Calculates total bioload based on your tank dimensions and desired fish, flags overcrowding risks, and surfaces the exact water parameters your species require.
- Water Parameter Logger: Track water chemistry over time directly in the app to spot trends early, with maintenance records kept alongside your parameter history.
- Automated Maintenance Reminders: Set personalized water change and dosing schedules; dosing amounts are calculated automatically based on your tank's size.
- Full Calculator Suite: Covers tank volume (six shapes), substrate depth and weight, CO2 for planted tanks, heater wattage, water change volumes, and imperial/metric unit conversions.
Use Cases
- A beginner setting up their first freshwater aquarium uses the stocking calculator to avoid overcrowding and the dosing calculator to safely add water conditioners.
- A reef hobbyist manages three saltwater tanks, logging parameters weekly and receiving automated reminders for water changes and supplement dosing.
- A planted tank enthusiast uses the CO2 calculator alongside the chemical dosing tool to dial in fertilizer and CO2 injection rates for healthy plant growth.
- A pond owner calculates the correct volume for an irregular-shaped pond and determines the right dose of treatments for algae and water clarity.
- An experienced multi-tank hobbyist uses Pro's CSV export to back up years of parameter history and analyze long-term water chemistry trends in a spreadsheet.
Pros
- No Signup Required: Web calculators and the free app tier are fully accessible without creating an account, removing friction for new users.
- Generous Free Tier: 150 fish species, 154 chemical products, two tanks, and most calculators are included at no cost — enough for a permanent one- or two-tank setup.
- One-Time Pro Pricing: The Pro upgrade is a single $9.99 purchase with no ongoing subscription, making it a great value for serious hobbyists.
- Comprehensive Calculator Library: Covers every common aquarium calculation in one place, eliminating the need to juggle multiple tools or do manual math.
Cons
- Android Only: The full app experience is currently limited to Android; iOS users can only access the web-based calculators.
- Two-Tank Limit on Free Plan: Hobbyists managing three or more tanks must upgrade to Pro to add additional tanks and reminders.
- No Community or Social Features: Aqulator focuses on personal tank management and lacks forums, sharing, or community-driven content found in some competitor apps.
Frequently Asked Questions
Is Aqulator really free to use?
Yes. The free tier includes most calculators, up to 2 tanks, 3 reminders per tank, 150 fish species, and 154 chemical products — with no signup required. The Pro upgrade is a one-time $9.99 purchase.
Do I need to create an account to use the calculators?
No. The web-based calculators and the free app tier are fully usable without signing up or creating an account.
What does the Pro upgrade include?
Pro ($9.99 one-time) unlocks unlimited tanks and reminders, all 257 fish species, all 471 chemical products, a fish recommender, an aquarium planner, CSV data export, and cross-device sync.
Is Aqulator available on iPhone (iOS)?
Not yet. Aqulator is currently available on Android via the Google Play Store. Web-based calculators are accessible from any browser, including iOS devices.
What types of tanks does Aqulator support?
Aqulator supports freshwater, saltwater (reef and fish-only), and pond systems, with calculators and chemical databases tailored to each water type.
