Reef Tank Log: Parameters

NEVER LOSE YOUR REEF DATA AGAIN.

Reef Tank Log is the offline-first journal built for saltwater reef keepers. Log your parameters, schedule your dosing, and track your corals — all on your device. No account. No ads. No subscription just to write down a test result.

Tired of apps that crash and wipe months of data, or suddenly lock basic logging behind a paywall? This one doesn't. Logging your parameters and backing up your data are free, forever.

— TRACK EVERY PARAMETER —

Salinity, alkalinity, calcium, magnesium, nitrate, phosphate, pH and temperature, logged with the exact precision reefers need (yes, salinity to 1.0255). Tag each result with the kit you used — Hanna, Salifert, Red Sea or API.

— FIX A BAD READING —

Fat-fingered 85 instead of 8.5? Open the reading history from the chart and edit or delete any single point. Your trend line is never stuck with a typo.

— SEE THE TREND, NOT JUST THE NUMBER —

Clean trend charts with your target range shaded in, so you instantly see when alkalinity is drifting. View 30 days, 90 days, a year, or all of it, with a stability readout for the window.

— DOSING DONE RIGHT (Pro) —

Schedule alk, calcium, magnesium and trace doses daily, every N days, or on a chosen weekday, with local reminders that fire offline. Tick a dose off in one tap.

— A REEF-FOCUSED LIVESTOCK JOURNAL —

Add corals, fish and inverts by common and scientific name, sorted into SPS, LPS, softies, fish and inverts. Keep a tagged written journal per animal to follow growth, colour and health, and mark anything fragged, sold or lost.

— MAINTENANCE & EQUIPMENT —

Log water changes with percentage and cost, skimmer services, glass cleans and media swaps. Keep a list of your lights, pumps, heaters and dosers with install dates and warranty notes.

— YOUR DATA STAYS YOURS —

Everything is stored locally on your device. Export a full backup to Files, iCloud or Drive anytime, and restore it in one tap. No login that can lock you out. No tracking. No ads.

FREE forever:

• 1 tank

• Unlimited parameter readings

• Trend charts and stability

• Livestock journal, maintenance and equipment

• Full backup & restore

Reef Tank Log Pro ($3.99/mo · $19.99/yr · $29.99 one-time):

• Unlimited tanks

• Dose schedules with offline reminders

Logging and backup are always free. Pro is a one-time option too — because we know reefers are done with subscriptions.

Built for the hobbyist who treats their reef like the living investment it is.

Terms of Use: https://codeensis.com/reeftanklog/terms

Privacy Policy: https://codeensis.com/reeftanklog/privacy

Monthly and Yearly are auto-renewing subscriptions billed through Google Play. They renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel any time in Google Play → Payments and subscriptions → Subscriptions. Lifetime is a one-time purchase and does not renew.