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reefnotes

reefnotes is a calm aquarium logbook in your browser. Log water tests, water changes and doses in one place; see a trend per parameter with your real readings, your water changes on the timeline and a forecast of where the value is heading. Freshwater, reef and planted. Free, no ads.

Trend chart for nitrate: your real readings, water changes marked on the timeline, a forecast band for the weeks ahead, and a what-if control to see how a skipped water change or a different dose would play out.

Cost / License

  • Free
  • Proprietary

Platforms

  • Online
Today on your tank: what is due, what needs a second look, and one tap to log a measurement, a water change or a dose.
The logbook: every test, dose and water change as one wide, editable table — tap a cell to correct a value, export everything as CSV.
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The free aquarium logbook that forecasts your water parameters — every test, dose and water change in one place, with a trend line that knows your water-change rhythm.
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reefnotes was added to AlternativeTo by Rafael-Awesomo on and this page was last updated .

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What is reefnotes?

reefnotes is a calm aquarium logbook that runs in your browser — nothing to install, works on every device.

Log every water test, water change and dose in one place. reefnotes draws the trend, learns your water-change rhythm as the logbook fills, and shows you where a value is heading before the tank shows it. Freshwater, reef and planted tanks alike.

• Water tests — NO3, PO4, KH, GH, pH, NH4, NO2, Ca, Mg, K, Fe and more, with the ranges that matter for your kind of tank • Trends — a chart per parameter with your real measurements, a forecast band and your water changes marked on the timeline • Logbook — every test, dose and water change as one wide, editable table • Schedules — recurring tasks for water changes, filter cleaning and dosing, with reminders on the day • Dosing — suggestions tuned to your water-change cycle, not a generic calculator • Sunday issue — a weekly summary of what your tanks did, in your inbox if you want it • Guides and calculators — CO₂ from KH and pH, hardness conversion, water-change impact, nitrogen-cycle timeline

No ads, no marketplace, no affiliate links dressed up as advice, no paywall. Your logs stay yours — export them any time, delete your account any time. Built by one developer who keeps a few tanks himself.