Reef Book

Reef Book

Take Control of Your Parameters

Download on App Store

Every Detail Matters

Log every parameter, tag every action taken, and document every change.

Reef Book log summary card showing notes, tags, and recorded parameter values together.

Customize Parameters

♥ Pin core readings, tune ranges, and shape the log around the tests you actually run.

Reef Book pinned parameters view with salinity, alkalinity, nitrate, and phosphate displayed together.

Spot Drift Early

Trend lines reveal patterns at a glance across the parameters you track most.

Reef Book salinity trend chart with recent readings plotted over time.

Keep Instructions Close

📖 Reference steps, timers, and checker guidance in the same workflow.

Reef Book test kit helper screen with a digital checker display and reference instructions.

Built for Sharing

Export trends and readings with share options tailored to each screen.

Reef Book log card preview prepared for sharing with parameter values over an aquarium photo.

Personalize Your Tank

Add a photo of your tank or pick from our curated wallpapers to make it instantly recognizable.

Reef Book wallpaper preview screen showing a clownfish image framed for the phone lock screen.

Everything You Need

30 Parameters

Track what matters with preferred units, color-coded ranges, and quick-entry presets.

Aquarium Hub

Keep reef, freshwater, planted, and quarantine setups organized in one workspace.

Easy Access

Pin the readings you check most so your daily routine takes seconds.

Trend Charts

See how your water changes over time and catch issues early.

Tags & Notes

Mark what happened and why so every reading tells the full story later.

Multilingual

Available in English, Deutsch, Español, Français, and 中文.

iCloud Sync

Your logs stay up to date across iPhone, iPad, and Mac without any setup.

Pay Once

One purchase, every device. No subscriptions, no surprise paywalls.