TankLog: Aquascape

Built by an aquascaper, for aquascapers.

Free. Local. Yours. TankLog is a free freshwater aquarium journal for planted tank and shrimp hobbyists. No login required. No subscription. It works fully offline, and everything stays on your device.

Built for the people who track CO₂ levels, obsess over KH and GH for their neocaridina colony, and want to know when their nitrates started creeping up. Not a generic fish app trying to cover everything.

WATER TESTING & PARAMETER TRENDS
Log pH, ammonia, nitrite, nitrate, KH, GH, phosphate (PO₄), TDS and temperature. Every reading is graded instantly against your own target ranges, and Parameter Trends charts every test so you can spot slow pH drifts, creeping nitrates or KH swings before they affect your plants or livestock.

CO₂ ESTIMATION
TankLog calculates dissolved CO₂ from your pH and KH and shows it as a color-coded zone: very low, low, ideal, high or at risk. Essential for high-tech planted tanks.

CARE SCHEDULES & ACTIVITY CALENDAR
Schedule water tests, water changes, filter cleans, dosing, feeding and more. Get reminders when tasks are due, see overdue items on your dashboard, and browse your whole care history and upcoming dates in the Activity Calendar.

DOSING, WATER CHANGES, FEEDING & CLEANING
Log every fertilizer, supplement and treatment with product, amount and date. Log water changes, feedings with species tags, and cleaning tasks, each with its own schedules and history.

ACHIEVEMENTS
Earn badges for consistent testing, on-time care and great water quality. Tap any badge to see how you earned it.

TANK NOTES
Jot down anything that isn't a log, like a tap water test or a new plant on the way. Notes show up in your Activity Calendar.

SIRI & SHORTCUTS
Say "Log a feeding in TankLog" and TankLog opens the right form, ready to fill in. Or put your own shortcut on the Action button.

EQUIPMENT, LIVESTOCK & PLANTS
Record your lighting, filtration, CO₂ system, heater and pumps. Log fish, invertebrates and plants (with scientific plant names), plus dates and notes.

MULTIPLE TANKS
Manage up to 3 tanks for free, each with its own parameters, schedules, livestock and history. Need more? Up to 10 Tanks is an optional one-time upgrade, with no subscription.

CLOUD SYNC (OPTIONAL)
Use TankLog on more than one device, or want a backup? Cloud Sync is an optional one-time upgrade, with no subscription, that keeps your tanks in your own private iCloud. A lost or new phone doesn't mean lost logs, and every iPhone and iPad signed in to your Apple Account stays the same. There's no account to create. TankLog can't see your synced data, and it's never sold, shared or used to market to you. Turn it off, or delete it from iCloud, whenever you choose.

YOUR DATA, YOUR WAY
Export your complete tank history as a file anytime and import it on any device. No account needed. Your data is yours, always.

No AI gimmick. No subscription. Every tracking feature free, forever. Just a well-built, honest tool from someone who loves this hobby as much as you do.

Metric and imperial units · 12h and 24h time · Light and dark mode · iPhone and iPad