TankDiary vs Aquarium Harmony

Know when your new tank is safe for fish — TankDiary reads your ammonia, nitrite and nitrate tests and names the cycle stage you're in. Log a water test by tapping the color that matches your test tube. No account, no cloud, nothing leaves your phone. TRACK WHAT MATTERS Log temperature, pH, ammonia, nitrite, nitrate, GH, KH, TDS and more in one quick sheet. Color-coded safe ranges tell you at a glance if something's drifting. Interactive charts show trends over weeks or years — with the safe zone drawn right on the graph and touch-to-read values on every point. KNOW WHEN SOMETHING'S WRONG The home screen flags out-of-range parameters and overdue maintenance across all your tanks the moment you open the app — no drilling in required. NEVER MISS A WATER CHANGE Set schedules for water changes, filter cleans, dosing and trimming, with reliable local reminders at the time you choose. The built-in water change calculator tells you how much to pull, how much conditioner to add, and — the part nobody else answers — what the change will actually do to your nitrate, including the floor set by nitrate in your own tap water. YOUR WHOLE TANK, REMEMBERED Livestock list with photos — fish, inverts, plants — searchable by species. A photo journal for milestones, rescapes and diary notes, with full-screen pinch-to-zoom. Everything works offline. SPEAKS YOUR LANGUAGE Fully translated into German, Japanese and Brazilian Portuguese, with the terms hobbyists actually use. Units follow your region and can be changed anytime. HONEST PRICING Free forever: 1 tank, working reminders, 30 days of history, the full cycle tracker, the color chart and the calculator. TankDiary Pro unlocks unlimited tanks and full history as a one-time purchase — pay once, own it forever. There's a cheap yearly option too, but we think you'll prefer to just own it. No account. No cloud lock-in. No selling your data — there's nothing to sell; it never leaves your device. Made by a hobbyist who got tired of spreadsheet water logs. Privacy Policy: https://tankdiary.com/privacy.html Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Aquarium Harmony is the calm, beautiful way to keep every fish tank thriving. Log water tests, build a care routine with smart reminders, and watch your aquarium come alive as a living, breathing picture of its real health - on iPhone, Apple Watch, and your home screen. Whether you keep a planted tank, a reef, a betta, shrimp, cichlids, or a classic freshwater community, Aquarium Harmony turns scattered notes and guesswork into one clear answer: what does my aquarium need today? A LIVING AQUARIUM, NOT A SPREADSHEET Every tank gets its own living world - water that brightens with good care and dims when maintenance slips. Three health rings show Care, Water, and Stability at a glance, with a full breakdown explaining every factor behind them. WATER TESTING MADE SIMPLE • Log pH, ammonia, nitrite, nitrate, temperature, GH, KH, TDS - plus salinity, alkalinity, calcium, magnesium, and phosphate for marine and reef tanks • Clear trend charts with safe ranges for your exact setup • Spot drift early: rising nitrate, falling KH, temperature swings • Stability tracking shows which parameters hold steady and which wander SMART CARE REMINDERS • Water changes, filter maintenance, plant trimming, dosing, equipment checks - on your schedule • Feeding schedules with portions, so everyone in the family knows who fed the fish • One "Next up" priority every day: never wonder what matters most • Complete care from your wrist with the Apple Watch app KNOWS YOUR FISH A built-in species guide with 70+ popular fish, shrimp, snails, corals, and plants. Aquarium Harmony reads your real stock: preferred water ranges, group-size suggestions, and compatibility notes - turned into friendly insights, not alarms. YOUR AQUARIUM'S MEMORY • A unified timeline of every test, water change, milestone, and photo • Take photos in the app and watch your aquascape evolve • Day counters, care streaks, and milestones celebrate the relationship you're building APPLE WATCH, WIDGETS & COMPLICATIONS • Full watch app: today's care, health rings, and one-tap task completion • Home-screen widgets for one tank or your whole fishroom • Watch-face complications and Smart Stack support SHARE & BACK UP Export any aquarium as a compact encrypted file - share your setup with friends or move it to a new device in seconds. FREE & PREMIUM Aquarium Harmony is free for one aquarium with core care tools. Premium unlocks unlimited aquariums, deeper analytics (forecasts, correlations, full health breakdowns), your complete history, weekly reports - and removes ads. Subscriptions renew automatically until cancelled; a one-time lifetime purchase is also available. Prices are shown in the app before any purchase. PRIVATE BY DESIGN No account required. Your data lives on your device - export it anytime. Whether you're cycling your first 10-gallon tank or managing a fishroom full of aquariums, Aquarium Harmony gives your underwater world the calm, consistent care it deserves. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://seatemp.link/AquariumHarmonyPrivacyPolicy.html