10-second logging
Tap the parameter, punch the number, done. Designed for wet hands and short attention spans.
Log your reef parameters in 10 seconds. See trends instantly.
A dead-simple water test tracker for reef and freshwater tanks. No app to download. Works on any phone.
Pre-order now — get access at launch$29 lifetime for early adopters · Monthly plan available at launch
Launching April 2, 2026
Built by a hobbyist, for hobbyists.
Features
Trend graphs, automatically
Every reading becomes a line on a chart. Watch your Alk, Ca, and Mg over days, weeks, or months without touching a spreadsheet.
Test reminders
“It’s been 7 days since you tested Alkalinity.” Set it once, never forget a test day again.
Dosing log (coming soon)
Track what you dose alongside your parameters. See cause and effect in one place.
See trends instantly.
Every reading becomes a line on a chart. Watch your Alk, Ca, and Mg over days, weeks, or months — without touching a spreadsheet.
AlkalinityCalciumMagnesium
Simple pricing. No surprises.
Monthly
$3
per month
Cancel anytime
AVAILABLE AT LAUNCHWhy ReefLog
Works on iPhone, Android, tablet, desktop — it’s a web app, no install needed.
Your data stays yours — CSV export included.
Built by a hobbyist, for hobbyists. Not a venture-funded app that’ll disappear in two years.
Frequently asked questions
- What parameters can I track?
- Alkalinity (dKH), Calcium (ppm), Magnesium (ppm), Nitrate, Phosphate, pH, Salinity, and Temperature — plus custom parameters for anything else you test.
- Do I need to download an app?
- No. ReefLog is a web app that works in any modern browser on iPhone, Android, tablet, or desktop. Just open the site and start logging — no install required.
- How is this different from a spreadsheet?
- ReefLog is purpose-built for reef keepers. You get instant trend graphs, test reminders, and a mobile-optimized interface designed for wet hands — no formulas, no formatting, no fuss.
- Can I track multiple tanks?
- Yes. Paid plans support unlimited tanks. Switch between them with a single tap.
- What happens if I cancel my subscription?
- Your data stays yours. You can export everything as CSV at any time. If you cancel, you'll drop to the free tier with limited features, but your data is never deleted.
- Is there a free tier?
- Yes. The free plan lets you track one tank with 90 days of data history. Upgrade anytime for unlimited tanks, reminders, and full data retention.