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First release. Log water tests, follow the nitrogen cycle, check stocking before you buy and look up fish illnesses with treatments — all of it works offline.
Water tests, nitrogen cycle coach and stocking checks — offline, no account.
Shoal is the field journal for your aquarium. It takes the readings you already write on a scrap of paper and turns them into answers: where your cycle is, what your water is about to do, and whether the fish you are about to buy will work. READINGS THAT MEAN SOMETHING Log a test in seconds by tapping the colour you see in the tube instead of typing a number. Every value is judged against your tank type and your actual stock — a nitrate of 30 ppm is unremarkable in a community tank and a real problem on a reef, and Shoal knows the difference. Tank Pulse turns your whole history into one number, then shows you exactly which points were taken off and why. CYCLE COACH — IS MY TANK CYCLED? The question every new keeper asks finally has a real answer. Shoal reads your ammonia, nitrite and nitrate history and tells you which stage of the nitrogen cycle you are in, what to do next, and roughly how long is left. It also catches the reasons cycles stall: a pH that has dropped below 6.5, a carbonate hardness heading for zero, ammonia dosed too high, water that is simply too cold. AQUARIUM STOCKING CALCULATOR THAT EXPLAINS ITSELF Add what lives in your tank and Shoal works out the bioload against your real water volume and your filter's turnover — then checks group minimums, adult size against your tank's footprint, temperament, fin-nipping, predation and which animals eat shrimp, snails or plants. Every fish compatibility conflict comes with the reason and the fix, not just a red cross. The comfort window shows the single temperature, pH and hardness range that suits every animal you keep — and tells you plainly when no such range exists. FISH DISEASE AND ALGAE IDENTIFICATION, OFFLINE A curated library of fish diseases, algae identification and plant deficiencies, with a symptom matcher that works with no connection. It knows the differences that matter — white spot wants the temperature raised, columnaris wants it lowered, and confusing the two is how people lose a whole tank. FIFTEEN CALCULATORS Real tank volume after substrate and hardscape. Water change percentage to hit a target. Dosing from any label. CO2 from pH and KH. Remineralising RO water. Raising KH. Salt mix and lowering salinity. EI fertiliser. Heater and filter sizing. Substrate weight. Evaporation. Feeding. Unit conversion. Plus a guided drip acclimation timer. YOUR DATA IS YOURS Shoal works completely without an account — aquarium water parameters and everything else live on your device and export as JSON or CSV in one tap. Sign in only if you want a backup and sync across your devices, with email or Google. You can delete your account, and everything stored with it, from inside the app. No ads. No analytics. No tracking. SHOAL PRO Shoal is free and genuinely useful on one tank. Pro adds unlimited tanks, your full reading history and trends, the complete compatibility engine, every calculator, cloud sync and the AI Tank Vet — photo diagnosis for disease, algae and plant deficiency, read alongside your actual water readings. Shoal is a record-keeping and reference tool for hobbyists. It is not veterinary advice. Shoal Pro is available as a monthly or yearly subscription, or as a one-time Lifetime purchase. Subscriptions are billed through Google Play and renew automatically until cancelled; you can manage or cancel them at any time in the Play Store. Terms of Use: https://szymdzie.github.io/shoal/terms.html Privacy Policy: https://szymdzie.github.io/shoal/privacy.html