ReefKeep

ReefKeep is a modern, private tracker for saltwater and freshwater aquariums — built for hobbyists who want fast logging and proactive insights, not just prettier graphs.

WHAT YOU CAN DO
• Log 8 parameters in under a minute with a clean one-screen entry
• Scan Hanna Checker readings with the camera — no more transcribing numbers
• Track alkalinity, calcium, magnesium, nitrate, phosphate, pH, salinity, temperature and any custom parameter you care about
• See trends as native charts with your target ranges overlaid
• Schedule recurring tasks (water changes, filter swaps, skimmer cleaning) with local reminders
• Record livestock with timelines for spawning, fragging, moves and notes

THE INSIGHTS ENGINE
Other apps show you numbers. ReefKeep tells you what they mean.
• Trend alerts — "Alkalinity has fallen 8% over your last 5 tests"
• Correlation hints — "Alk and calcium are both dropping. Check your 2-part dosing."
• Stale data warnings — "You haven't tested nitrate in 12 days"
• Smart water-change recommendations based on your actual nitrate trajectory, not a fixed schedule

Everything runs on your device. Nothing leaves your phone unless iCloud sync is enabled.

ASK THE ON-DEVICE COACH
With Apple Intelligence (iPhone 15 Pro and later), tap any insight and get a plain-language explanation grounded in your own tank's readings — all processed on-device, no accounts, no servers.

BUILT FOR REEFERS
• Dark mode first — matches how you actually use the app next to a lit tank
• Dual units everywhere: L/gal, °C/°F, ppt/SG, dKH/meq/ppm
• Multiple tanks (Pro)
• iCloud sync across your iPhone and iPad — included, not an upgrade
• Zero ads, zero tracking SDKs, zero account required

PRO UNLOCKS
• Unlimited tanks
• Unlimited parameter history
• Insights engine
• CSV export for your records
• Photo galleries
• Apple Watch (coming soon)

Monthly and yearly subscriptions, or a one-time lifetime unlock if you prefer to own your tools.

ReefKeep is built by a small team that uses it on their own tanks. We're not trying to be everything for every hobby. We're trying to be the tool you open once a week without thinking, and the app that catches a problem before it costs you a fish.

The app applies the standard Apple Terms of Use (EULA) https://www.apple.com/legal/internet-services/itunes/dev/stdeula/