MerunoOne tap logs a water change
Quick buttons for the things you do weekly. The log entry is written the moment you tap — no forms unless a form is genuinely needed.
A tank’s whole life — in one journal
Meruno is a keeper’s journal for iPhone, Android and Mac. Water changes, treatments, livestock, photos — logged in seconds, stored on your devices and in your own iCloud.
Coming to the App StoreComing to Google PlayThe journal is free. Forever.
The developer’s own journal — five years of his own tank
The journal
Everything a tank lives through
Treatments remember how they ended
A course has a start, an end and a verdict — helped or didn’t. Next time something looks off, the journal already knows what worked.
Every fish is counted
Arrivals, losses, moves between tanks. Fish with names are tracked by name; the census always matches the log that produced it.
Photos live on the timeline
The fish themselves, tagged by species, right between the water changes. Full size, no recompression — your camera roll quality.
On the phone
A journal that shows you back
The Mac sees the whole fishroom
Every tank in the sidebar, the journal beside it. The Mac app reads the same journal your phone writes — one purchase, one household, one truth.
Free, with no catch
The journal costs nothing
Not a trial. Not a teaser. The whole journal, free forever:
- unlimited tanks, species, photos and history
- backup into your own iCloud — or Google Drive on Android
- export whenever you want
- no account, no ads, no tracking
Your records never touch our servers — we don’t have any. They live on your devices and in your personal iCloud or Google Drive.
If you want more
A subscription adds the parts that cost real infrastructure:
- sync to a second device — iPhone with Mac, Android with Android
- care reminders that clear themselves when you log the chore
- atlas enrichment — photos and facts fetched for your species
$11.99 a year, or $29.99 once — yours forever. And a tip jar, if you just want to say thanks.
I keep aquariums, like you. Meruno grew out of my personal journal — the tank in every screenshot here is my own, and the entries are five years of real care for it. I built the tool I couldn’t find, and I run it every day. I hope it keeps your water clear too.