# Coralog — Reef tank & dosing tracker

> Reef tank & dosing tracker (iPhone/iPad app by Ryosuke Igarashi.)

- Source: https://appshunter.io/ios/app/coralog/id6786378477 (this page in markdown: same URL + `.md`)
- Developer: [Ryosuke Igarashi](https://appshunter.io/developer/6781130241)
- Category: Lifestyle, Utilities
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 4 MB
- Languages: American English, Dutch, French (France), German (Germany), Italian, Japanese, Korean, Polish, Brazilian Portuguese, Chinese (Simplified, China) and 3 more
- Released: 2026-07-08
- Data updated: 2026-08-19
- User reviews in markdown: https://appshunter.io/ios/app/coralog/id6786378477/reviews.md

## What is Coralog?

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.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Banneton Premium Monthly | $6.99 | per month |
| Banneton Premium Annual | $39.99 | per year |



## Version history (last 5 releases)

### 1.0.4 — 2026-08-11

Coralog now speaks your language. The whole app — every screen, label, and parameter name — is available in 12 more languages, along with its App Store page.

### 1.0.3 — 2026-08-06

Fixes the Premium screen not loading subscription options for some users.

### 1.0.2 — 2026-07-29

• Performance improvements and small fixes.

### 1.0.1 — 2026-07-13

Coralog Premium is now available: correlation-style drift watch and the dosing calculator, with a 7-day free trial.

Thanks for keeping steady reefs with Coralog!

### 1.0 — 2026-07-08

No release notes.

## More apps by Ryosuke Igarashi

- [ReadLog: Reading Journal](https://appshunter.io/ios/app/readlog-reading-journal/id6781130239)
- [Settura: IBS & Gut Tracker](https://appshunter.io/ios/app/settura-ibs-and-gut-tracker/id6781145402)
- [MotorLog: Car & Fuel Tracker](https://appshunter.io/ios/app/motorlog-car-and-fuel-tracker/id6781159313)
- [RefluxLog](https://appshunter.io/ios/app/refluxlog/id6781159330)
- [Skinote: Eczema Tracker & Log](https://appshunter.io/ios/app/skinote-eczema-tracker-and-log/id6782466803)
- [PawLog: Pet Health Tracker](https://appshunter.io/ios/app/pawlog-pet-health-tracker/id6782466968)

All apps by Ryosuke Igarashi: https://appshunter.io/developer/6781130241

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-19.*