AquaKeeperWater test log with charts
Thirteen parameters, from pH to phosphate, charted against the healthy range for your tank type. Readings outside the range are flagged and explained.
Aquarium tracker for Android
The fish tank tracker that works offline.
Log water tests, get maintenance reminders, check tank-mate compatibility and look up care sheets for 200 species. Everything stays on your phone, and there is no account to create.
Free on Android 7.0 and newer · iPhone version coming to the App Store · Supported by ads · No subscription, no account
pH 7.2 in range
Water change Sunday
Health score 92
200species care sheets
19care guides
13water parameters
6tank types
5calculators
What it does
Everything a tank needs, in one app
Freshwater, planted, shrimp, brackish, saltwater and reef. Add as many tanks as you keep; each one gets a health score and a Tank Advisor that says what to do next.
Reminders that fire
Recurring tasks for water changes, filter cleaning, testing, dosing and feeding. A notification at the hour you choose, with Mark done built in.
200 species with care sheets
114 fish, 30 shrimp, snails and other invertebrates, 32 plants and 24 corals. Temperature, pH, hardness, minimum tank size, diet and temperament for each.
Compatibility checker
Predator and prey pairs, aggressive species and clashing temperature or pH ranges, each flagged with a plain-language reason before you buy.
Guides and doctors
19 care guides, a Fish Disease Guide that matches what you see to common diseases, and a Plant Doctor that works from the symptoms you tick.
Calculators for the chores
Tank volume from dimensions, water change, stocking, dosing and a nitrate reducer, in litres or US gallons and °C or °F.
Water
Water tests become trends
Log a reading in a few taps. AquaKeeper draws it against the healthy range for your tank type, flags what is off, and the tank's health score tells you what to do about it.
- pH, ammonia, nitrite, nitrate, GH, KH, TDS and temperature, plus salinity, calcium, magnesium, alkalinity and phosphate for marine and reef tanks
- Healthy ranges for freshwater, planted, shrimp, brackish, saltwater and reef tanks, drawn on every chart
- A note on any test, so the water change or the new fish is next to the number it explains
- One health score per tank, with Tank Advisor insights that turn a bad reading into the next step
Nitrate · Living Room Community
Last 8 weeks · mg/L
AquaKeeper · Tank careLiving Room Community · 30 % change, every 7 days
Mark done
Maintenance
Reminders that fit your routine
Set up each chore once. AquaKeeper schedules it, reminds you at the hour you choose and lets you tick it off from the notification itself.
- Templates for water changes, filter cleaning, testing, plant trimming, dosing and feeding, or your own schedule
- Reminders survive a restart of the phone and never need a server
- Feeding and dosing routines, a cycling tracker for new tanks and a progress photo gallery
- Every completed task lands in the tank's journal automatically
Species database
200 species, with the numbers that matter
Search by name, filter by type and water, save favourites and compare up to three side by side. Add livestock to a tank and keep an eye on its stocking level. A few examples, straight from the app:
BettaBetta splendens
- Temperature
- 24–30 °C
- pH
- 6.0–7.5
- Min tank
- 19 L
- Size
- 7 cm
- Care
- Beginner
- Temperament
- Aggressive
Neon TetraParacheirodon innesi
- Temperature
- 20–26 °C
- pH
- 5.5–7.5
- Min tank
- 40 L
- Group
- 6 or more
- Care
- Beginner
- Temperament
- Peaceful
Amano ShrimpCaridina multidentata
- Temperature
- 18–28 °C
- pH
- 6.0–7.6
- Min tank
- 40 L
- Group
- 5 or more
- Diet
- Algae
- Care
- Beginner
Anubias NanaAnubias barteri var. nana
- Temperature
- 22–28 °C
- pH
- 6.0–7.5
- Light
- Low to medium
- CO₂
- Not needed
- Placement
- On wood or rock
- Care
- Beginner
ZoanthidsZoanthus sp.
- Light
- Low to medium
- Flow
- Low to medium
- Placement
- Low to mid rockwork
- Feeding
- Photosynthetic
- Care
- Beginner
- Temperament
- Peaceful
Guides
19 guides, written for real tanks
Short, practical and available offline. From the first fishless cycle to reef water chemistry.
Getting started
- Cycling a new tank
- Choosing and adding fish
- Acclimating and quarantining
- A simple maintenance routine
Water
- Water temperature
- Water conditions by fish group
- Ammonia, nitrite and nitrate
- pH, GH, KH and TDS
- Water changes
Fish and invertebrates
- Feeding fish
- Betta care
- Goldfish care
- Keeping shrimp
- Building a peaceful community
Plants and algae
- Planted tank basics
- Algae: causes and control
Reef
- Reef water chemistry
- Starting a reef tank
Equipment
- Filters and filter care
Fish Disease Guide
Match what you see, from white spots to clamped fins, to the common diseases and their treatments. Includes which medications are unsafe for shrimp, snails and corals.
Plant Doctor
Tick the symptoms, such as yellow old leaves, pale new growth, pinholes, melting or algae, and get the likely causes and what to dose or change.
A look inside
Built for the phone in your wet hand
Dark by design, large touch targets and the number you came for at the top of every screen.
Your data
Your data stays yours
AquaKeeper is a tool, not a service. Your tanks, readings, tasks and photos live in the app on your phone and go nowhere else.
- Every feature works without an internet connection
- No account, no sign-in, no cloud copy of your tanks
- Export a full backup whenever you like and restore it on a new phone
- Free and supported by ads; no subscription and no limit on the number of tanks
Units your way
Litres or US gallons, °C or °F, and your own currency for what the hobby costs.
Journal, analytics, achievements
A journal that logs completed tasks and new livestock for you, plus your own notes, analytics across all your tanks, and achievements for keeping the routine.
Questions
Frequently asked
Does AquaKeeper work offline?
Yes. Logging, reminders, the species database, guides and calculators all work without a connection. Only the ads need one.
Do I need an account?
No. There is nothing to sign up for. Your data is stored on your phone, and you can export a backup at any time.
Which kinds of tanks does it support?
Freshwater, planted, shrimp, brackish, saltwater and reef. Each type has its own healthy ranges, and marine tanks get salinity, calcium, magnesium, alkalinity and phosphate on top of the freshwater parameters.
How do the reminders work?
Each task has a schedule and a time of day. AquaKeeper sets an alarm on the phone for it, so the notification arrives even when the app is closed, and you can mark the task done from the notification. Reminders are rescheduled after a restart.
Can I move my data to a new phone?
Yes. Export a backup from Settings, move the text to the new phone, and restore it there. Everything comes across: tanks, readings, tasks, livestock, journal and settings.
Is there an iPhone version?
It is in the works. AquaKeeper is built with Compose Multiplatform, so the same app is coming to the App Store; the Android version is first. Your backup will move across when it does.
Is it free?
Yes. AquaKeeper is free and supported by ads. There is no subscription and no limit on the number of tanks.
Keep every tank in one place
Water tests, reminders, 200 species and the guides to go with them. On your phone, working offline.
The iPhone and iPad version is in the works and will land on the App Store.