Aqulator - Aquarium Manager

Aquarium Management & Logs

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

Get exact chemical doses and check fish tank mates before you buy. New: keep a daily care streak going by logging water tests and finishing tank tasks. Aqulator is a free aquarium calculator and fish tank manager for freshwater and saltwater tanks. Get accurate stocking levels and chemical doses in seconds. Check tank mate compatibility across 250+ species. Track water test results over time. One aquarium app instead of ten bookmarks. CALCULATORS Stocking Calculator Calculate exactly how many fish your aquarium can support based on volume and species bioload. Surfaces recommended water parameters for every species you stock. Fish Compatibility Checker Check tank mate compatibility across 250+ freshwater and saltwater species before you buy. Aqulator flags conflicts in temperament and water parameter needs, then explains exactly why a pairing doesn't work so you can make an informed decision. Chemical Dosing Calculator Get the exact dose for over 450 aquarium chemicals based on your tank volume. Each product includes safety warnings and detailed dosage output so you know exactly what you're adding to your aquarium. CO2 Calculator Calculate the right CO2 injection rate for planted tanks based on volume and plant load. Keeps your aquarium plants healthy without harming fish. Tank Volume Calculator Calculate gallons or liters for rectangular, cylindrical, bowfront, and hexagonal aquarium shapes. Also shows the filled weight so you know what your floor is holding before you set up. Heater Wattage Calculator Find the right heater wattage for your aquarium size and room temperature. Ammonia Toxicity Calculator Check whether your ammonia levels are dangerous based on pH and temperature. Ammonia toxicity shifts dramatically with pH - this calculator accounts for that. Substrate Calculator Calculate how much gravel or sand your aquarium needs for your target depth and tank footprint. Weight Calculator Know how heavy your full aquarium setup will be before you fill it. Water Change Calculator Get the right water change percentage and frequency based on your stocking level. Unit Converter Imperial to metric conversion for every common aquarium measurement. TANK MANAGEMENT My Tanks Create a profile for each freshwater or saltwater aquarium you own. Calculators, reminders, logs, and history all connect back to it. Switch between tanks from anywhere in the app so managing multiple aquariums stays organized. Reminders Set aquarium maintenance reminders tied to your tanks and schedule. The dosing calculator feeds directly into reminders so you can schedule a treatment with the exact dose already filled in. Turn on personality mode and get notifications written from your fish's perspective using the names you gave them. Water Test Log Track water test results and chemistry readings over time so you can spot problems before they get serious. Maintenance records sit alongside your parameter history for a complete picture of each aquarium. Calculation History Every calculation you run saves to your history. Reference past results or rerun them with updated numbers any time. AQULATOR PRO Free users get full access to every aquarium calculator with two tanks and three reminders each. Upgrade to Pro to unlock: • Unlimited tanks and reminders • Full database of 250+ fish species and 450+ chemicals • Aquarium planner and fish recommender • Test Kit Scanner: photograph a test strip or liquid kit for instant water readings • Tank Rating: photo-based score out of 10 with visual feedback • Backup, export, and import your aquarium data • Cross-device sync • Calculation and tank activity history • Support independent development • More features coming soon One-time purchase. Yours forever. No subscription. Whether you're setting up your first fish tank or managing a multi-tank fishroom, Aqulator is the free aquarium app built for real fishkeepers. Download it and stop guessing.

Ratings & Reviews

  • This app hasn’t received enough ratings or reviews to display an overview.

• Aqulator Lite: a lower-cost subscription, alongside lifetime Pro • Care Streak: track your consistency and celebrate milestones • Tank Logger: set a custom target range for each parameter, and pick a chart time range with quick presets • Reminders can repeat on specific weekdays or on longer monthly and yearly cycles • Redesigned onboarding and upgrade screen, with smoother animations you can switch off in Settings • Fixed: some fish showed a minimum tank size that was too small

Version 1.2.3

The developer, Olga Vassilenko, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Linked to You

    The following data may be collected but it is not linked to your identity:

    • Purchases
    • Location
    • User Content
    • Identifiers
    • Usage Data

Privacy practices may vary, for example, based on the features you use or your age. Learn More

Accessibility

The developer has not yet indicated which accessibility features this app supports. Learn More

Information

Seller
Olga Vassilenko
Size
50 MB
Category
Utilities
Compatibility
Requires iOS 16.4 or later.
  • iPhone
    Requires iOS 16.4 or later.
  • Mac
    Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.
  • Apple Vision
    Requires visionOS 1.0 or later.
Languages
English and 16 more
  • English, Dutch, French, German, Hindi, Indonesian, Italian, Japanese, Korean, Polish, Portuguese, Russian, Simplified Chinese, Spanish, Swedish, Turkish, Ukrainian
Age Rating
4+
In-App Purchases
Yes
Copyright
© 2025 Greg M
  • Privacy Policy

    • More by Olga Vassilenko

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