AquaKeeper: Aquarium Water Log

Your fish can't tell you when the water turns bad. AquaKeeper reads your aquarium water test and tells you exactly what to fix - in plain English.

Most aquarium apps just store your numbers. AquaKeeper closes the loop: test, score, understand, act.

LOG AN AQUARIUM WATER TEST IN UNDER A MINUTE
- Ammonia, Nitrite, Nitrate, pH and Temperature - the five water parameters that matter most
- Advanced water parameters (GH, KH, salinity, phosphate and more) one tap away when you're ready
- Every field shows the safe range while you type, so a bad number is obvious instantly
- Works with any liquid test kit or test strips - just type the reading you see
- Didn't test something? Leave it blank. Nothing is forced

ONE SCORE, ONE VERDICT
- Instant 0-100 Water Health Score with five verdicts: Excellent, Good, Fair, Poor, Dangerous
- Your aquarium health score updates after every test, with a one-line takeaway in plain language: "Water looks good, keep it up"
- See the change since your last aquarium water test: "+4 since Aug 19"

TAP ANY PROBLEM, GET THE FIX
- Plain-English breakdown: what's wrong, why it happened, what to do right now
- Handles every reading: ammonia spikes, nitrite while cycling, nitrate build-up, pH swings
- Real numbers, not vague advice: "Change about a third of the water (18 L), feed once a day, retest in two days"
- One tap into the water change calculator, already filled with your tank size and readings
- Set the retest reminder in one tap

8 AQUARIUM CALCULATORS, INCLUDED FREE
- Water change calculator - current value to target value, exact litres or gallons, with tap-water correction
- Ammonia toxicity - how toxic your ammonia really is at your pH and temperature
- Tank volume - length x width x height to litres or gallons
- Stocking level - how many fish your fish tank can actually hold
- Substrate - how much sand or gravel to buy
- Heater wattage - the right heater size for your tank
- Full tank weight - know what your floor is carrying before you fill it
- Unit converter - ppm/mg-L, C/F, cm/inches, litres/gallons

CHARTS THAT WARN YOU EARLY
- Clean line charts for every water parameter, with safe-range bands drawn in
- Unlimited history, unlimited aquariums - nothing locked, nothing capped
- Catch a slow nitrate climb weeks before it starts killing fish

KNOW WHAT'S IN YOUR TANK
- Livestock profile: species, quantity, health status and date added
- Built-in fish database adjusts your target ranges to the fish you actually keep
- Photo timeline so you can watch your tank grow

NEVER MISS A WATER CHANGE AGAIN
- One-tap daily log: water change, feeding, trimming, glass cleaning, filter rinse, fertilising, or your own custom action
- Month calendar with dots - your whole aquarium maintenance routine at a glance
- Water change reminders, test reminders and maintenance reminders. They default to off, so you decide

PRIVATE BY DESIGN
- No account. No sign-up. No cloud upload
- Everything is stored on your device, and it works offline
- Export your records anytime

NEW TO FISHKEEPING? START HERE
- Not sure what ammonia, nitrite and nitrate actually mean? Every parameter comes with a plain-English explanation
- Cycling a new tank? Watch the ammonia and nitrite rise and fall, and know exactly when your tank is ready for fish
- No chemistry background needed, and no need to google your test results ever again

Built for fishkeepers of every level: cycling your first tank, betta and goldfish tanks, planted tanks, shrimp tanks, community tanks, and anyone who wants an aquarium tracker that explains the numbers instead of just storing them.

Call it an aquarium log, a fish tank tracker, a water test journal or an aquarium maintenance planner - AquaKeeper is a free, private aquarium manager that takes three minutes to start.

Download free and finish your first water test today.