Log pH, ammonia, nitrite and nitrate with one tap per value, see every trend against the ideal range, and never miss a water change again. Everything stays on your phone.
Coming soon to theApp StoreComing soon toGoogle Play
No account
No ads or tracking
Works offline
Free to start
Features
Everything your tank needs, nothing it does not
ReefLogix is built around the few things reef keepers do every week: test the water, read the numbers, keep up with maintenance and enjoy the livestock.
Log in seconds
Tap the value that matches your test kit card
Each parameter shows five quick values that line up with common color cards. Tap one and ReefLogix moves to the next test. Need a precise number? Tap Exact and type it.
pH
Ammonia
Nitrite
Nitrate
One tap per value, with Skip for anything you did not test.
Water change today with a quick percent, which also checks off your water change reminder.
Test kit photo and notes for the readings you want to remember.
Trends and ideal ranges
See where every number is heading
Every chart shows the ideal band for reef tanks, so you can tell at a glance whether a reading is drifting. Scrub the line for any date, compare this week to last, and check the average, lowest and highest value.
Ideal
Low
Elevated
Critical
Ranges from 7 days to all time, with a full history list you can edit.
A reef health ring on Home that shows how many parameters are in range.
Plain language insights like "Nitrate is trending up."
Test saved
A clear answer after every test
When you save a test, ReefLogix tells you what is right where it should be and what needs a look. If something is off, you get one practical tip with a button to act on it.
Streaks like "27 tests on schedule" keep the routine going.
Tips for the worst value first, for example a 20% water change when nitrate creeps above 10 ppm.
One tap to schedule a water change or a retest for tomorrow.
Reminders
Maintenance that remembers itself
A water change every 7 days and a water test every 3 days are set up for you. Change the day and time, mark them done from the notification, or snooze for an hour.
A week view and a timeline of everything that is due.
Local notifications scheduled on your device, with Mark done and Snooze 1 hour.
Custom reminders for dosing, filters, cleaning and feeding with ReefLogix Plus.
My Reef
Your fish and corals, with their own photo albums
Add every fish, coral and invert in your tank, give them nicknames and build a photo gallery for each one. Watch a frag grow out month by month, all in one place.
Photo galleries from the camera or your library, with a cover photo you choose.
Time in tank, quantities and notes for each inhabitant.
Filters for fish, coral and inverts.
Species database
252 reef species with real photos
Browse fish, LPS, SPS, soft corals, anemones and inverts. Every entry has a real photo and the care data you need before you buy: care level, temperament, reef safety, maximum size, minimum tank size, temperature, pH and diet.
Species photos are from Wikimedia Commons and used under their Creative Commons or public domain terms. See the photo credits for every author and license.
Fits your reef
Know if it fits before you buy
Open any species and ReefLogix checks it against your own tank: the volume you entered and the fish and corals already in My Reef.
Your 75 gal tank is plenty, it needs 20 gal
Safe with your 2 corals
May squabble with similar fish
Offline and private
Your reef data never leaves your device
ReefLogix has no servers to send anything to. Your tanks, readings, photos and reminders live in the app on your phone or tablet, and it works the same with no connection at all.
No accountOpen the app and start logging. No sign up, no email.
No adsNot now, not later. The app is paid for by Plus.
No analytics or trackingNo SDKs that watch what you do.
Works offlineLogging, charts, reminders and the species database need no internet.
Stored on the deviceErase everything from Settings at any time.
Plain privacy policyShort and readable. Read it here.
Tablets and foldables
Made for every screen you own
On phones you get a bottom bar with a Log button under your thumb. On tablets and unfolded foldables, ReefLogix opens up into a sidebar with two pane layouts, in portrait and landscape.
Tablet
Unfolded foldable
Light and dark
Easy on the eyes, day and night
ReefLogix follows your system setting. Check your tank under the moonlights without being blinded.
Light
Dark
Pricing
Free forever. Plus if you want it all.
Everything you need to look after a tank is free. ReefLogix Plus is a single purchase that unlocks your full history and removes the limits.
Free
ReefLogix
0 USD, forever
No trial, no time limit.
Log tests, test kit photos and water changes
Trends and history for the last 7 days
1 tank
3 photos per fish or coral
The two default reminders
The full species database and Fits your reef
One-time purchase
ReefLogix Plus
4.99 USD, once
Local price set by Apple and Google. No subscription.
Your full history and trends, from day one
7D, 30D, 90D, 1Y and All ranges
Unlimited tanks
Unlimited photos per fish or coral
Custom reminders
Export to CSV
One payment. Yours forever.
Free and Plus compared
Feature
Free
Plus
Log tests, test kit photos, water changes
Yes
Yes
History in trends, charts, stats and streaks
Last 7 days
All readings
Chart ranges
7D
7D, 30D, 90D, 1Y, All
Tanks
1
Unlimited
Photos per fish or coral
3
Unlimited
Reminders
Water change and water test
Unlimited, including your own
CSV export
No
Yes
Species database, My Reef, Fits your reef, tips
Yes
Yes
FAQ
Questions, answered
When can I get ReefLogix?
ReefLogix is in final testing and coming soon to the App Store and Google Play. This page will link to both stores on launch day.
Which devices does it run on?
iPhone and iPad with iOS or iPadOS 17 or later, and Android phones, foldables and tablets with Android 13 or later. It adapts to every screen size, in portrait and landscape, in light and dark mode.
Do I need an account?
No. There is no sign up and no login. Open the app and log your first test.
Where is my data stored? Is it backed up?
Only on your device, inside the app. ReefLogix has no servers and no cloud sync, so we never see or hold your data. With Plus you can export your readings as a CSV file and keep a copy wherever you like. Your phone's own backup may include app data, depending on your device and settings.
What happens to readings older than 7 days in the free version?
They are kept. The free version shows the last 7 days in trends, history and stats, and Home always shows your latest value for each parameter. Older readings stay saved on your device and appear the moment you unlock Plus.
Is ReefLogix Plus a subscription?
No. ReefLogix Plus is a one-time purchase of 4.99 USD, with the local price set by Apple and Google. Pay once and keep it, including on a new device that uses the same Apple Account or Google account.
Can I move Plus between iPhone and Android?
Purchases belong to the store you bought from. Plus bought on the App Store restores on Apple devices signed in to the same Apple Account, and Plus bought on Google Play restores on Android devices signed in to the same Google account. The two stores do not share purchases.
Which test kits does it work with?
Any of them. You tap or type the values from your kit, so it works with liquid tests, test strips, handheld checkers and lab results. The quick values follow the steps on common color cards.
What are the ideal ranges?
ReefLogix uses general reef targets: pH 8.1 to 8.4, ammonia 0 to 0.05 ppm, nitrite 0 to 0.1 ppm and nitrate 2 to 10 ppm. The support page explains every status.
Where do the species photos come from?
From Wikimedia Commons, shared by photographers under Creative Commons licenses or in the public domain. Every photo is credited in the app and on the photo credits page.
ReefLogix
_(43372442502).jpg){kind=link}
