SALTWATER & FRESHWATER
Log parameters. Dose safely. Track every tank over time.
Reef Ledger helps hobbyists and fish stores keep reef and freshwater tanks in one place — salinity or pH, alk, calcium, nitrate, and more — with history charts, dosing guardrails, tank photos, and livestock records.
INSIDE THE APP
See it before you sign up
Swipe through the same screens hobbyists and stores use every day.
Tap a tile for its chart
Parameter log
Tap a tile for history. Hold to log.
Latest · 8.2 dKH
+0.1 from yesterday
History charts
7D to All ranges on every metric.
DT 120 · 120 gal
ALKALINITY
Target 8.5 · now 8.2 · within 1.4 dKH/day
CALCIUM
Target 420 · now 410 · safe
SAFETY CHECK
Magnesium dose stays under 100 ppm / 24h
Dose calculator
Safe alk, calcium, and magnesium shifts.
4 active
AddClownfish pair
Fish
Acropora millepora
SPS
Hammer coral
LPS
Cleaner shrimp
Invert
Livestock ledger
Fish, coral, and inverts in one list.
This week · 2 of 5 done
Weekly tasks
Check off maintenance as you go.
Parameter logging
Choose which parameters to track, open a chart, or log a reading from earlier today.
Dosing calculator
Safe one-time doses for live feeds and additives, with alk, calcium, and magnesium limits.
Tank progression
Save compressed tank photos over time so you can see how saltwater and freshwater setups change.
Livestock ledger
Log additions and losses for fish, coral, plants, and inverts in one simple list.
Reef Juice ready
Default products from reef-juice.com, with Shopify account linking for partner discounts.
Built for stores too
Fish stores can invite customer sub-accounts and share logging access for tanks they service.