Built by an aquascaper, for aquascapers.
Not a generic fish app trying to cover everything. TankLog is for the people who obsess over KH, GH and nitrates.
Everything your tank needs written down.
Water tests and trends
pH, ammonia, nitrite, nitrate, KH, GH, phosphate, TDS and temperature, graded against your own target ranges.
CO₂ estimate
Dissolved CO₂ worked out from pH and KH, shown as a color-coded zone.
Care schedules
Water tests, changes, filter cleans, dosing and feeding, with reminders when something is due.
Dosing and fertilizer
Every product, amount and date, with schedules for what goes in and when.
Water changes, feeding, cleaning
Volume and percentage for changes, species tags for feeding, history for every task.
Livestock and plants
Fish, invertebrates and plants, with dates added and notes.
Equipment
Lighting, filtration, CO₂ system, heater and pumps in one list.
Up to three tanks
Each with its own parameters, schedules and history. Switch with one tap.
Export and import
Your full history as a file you control. Move it to a new device any time.
Your tank stays yours.
Everything you enter is stored on your device. Cloud Sync, an optional one-time purchase planned for a coming update, is the only feature that sends anything off it.
- No ads, tracking or analytics
- No account needed to use the app
- Export or delete your data any time
- Read the full privacy policy
Who it's for
Watch pH, KH and CO₂ together, and see when a number starts to drift.
Log KH, GH, TDS and water changes for a neocaridina or caridina colony.
Water tests, dosing, feeding and cleaning in one place, with a history you can export.
Questions people ask
What is TankLog?
A free aquarium journal for freshwater planted tank and shrimp keepers. You log water tests, care tasks, dosing, livestock, plants and equipment, and watch the trends.
Is TankLog free?
Yes. TankLog is free, with no ads and no subscription. An optional Cloud Sync, a one-time purchase, is planned for a coming update.
Do I need an account?
No. There's no login. Everything you enter is stored on your device.
Does it work offline?
Yes. TankLog works without a signal.
Which water parameters can I log?
pH, ammonia, nitrite, nitrate, KH, GH, phosphate, TDS and temperature, graded against your own target ranges.
How does the CO₂ estimate work?
TankLog works out dissolved CO₂ from your pH and KH and shows it as a color-coded zone. It's an estimate, so use it as a guide.
How many tanks can I track?
Up to three, each with its own parameters, schedules and history.
Can I export my data?
Yes. Export your full history as a file you control and import it on a new device. You can also delete your data any time.
Does it run on iPad?
Yes. TankLog runs on iPhone and iPad.
Who makes TankLog?
TankLog is built by an aquascaper, for aquascapers, and is published here alongside the other apps from Couch Co-Op Studios.
Start your tank journal.
