Coralog
Reef tank & dosing tracker
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Log your water parameters, see what's drifting before it leaves range, and get the estimated ml to dose. Built for reef keepers — private, on your device.
Keeping a reef is a balancing act. Alkalinity, calcium, magnesium, nitrate, phosphate — your corals live or die by how steady you hold them. Coralog is a calm, private place to track it all and catch a swing before it costs you a colony.
WHAT YOU CAN DO
• Log every test in seconds — values show green, amber, or red against your target range, the moment you enter them
• Keep your dosing on schedule with countdowns and a tap to mark each dose done
• Track your livestock — corals, fish, inverts — with photos, sources, and how long they've been in your reef
• See every parameter's trend over time, with your target band drawn right on the chart
FREE — NO ACCOUNT NEEDED
Log unlimited parameters and doses, track your full livestock list, and see your trends across weeks and months. Export your own data as a CSV. Nothing core is locked behind a paywall.
PREMIUM — 7-DAY FREE TRIAL, THEN $6.99/MONTH OR $39.99/YEAR
• Drift watch: see which parameters are trending out of range — and roughly how many days you have before they do
• Dosing calculator: the calculated ml to raise alkalinity, calcium, or magnesium to your target for your tank volume
• Cancel anytime from your Apple ID settings
PRIVATE BY DESIGN
Everything you record stays only on your device. Coralog never uploads, syncs, shares, or sells your data. No account needed.
Coralog is a husbandry log. It does not provide water-chemistry or veterinary advice and is not a substitute for your own testing and judgment. Dosing figures are estimates — always verify against your additive's label and dose gradually.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Ryosuke Igarashi, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Ryosuke Igarashi
- Size
- 3.9 MB
- Category
- Lifestyle
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Ryosuke Igarashi