# Steady Reef — Saltwater aquarium calculator

> Saltwater aquarium calculator (iPhone/iPad app by Lance Allan Perry.)

- Source: https://appshunter.io/ios/app/steady-reef/id6794359531 (this page in markdown: same URL + `.md`)
- Developer: [Lance Allan Perry](https://appshunter.io/developer/6794359535)
- Category: Utilities, Lifestyle
- Price: $9.99
- Age rating: 4+
- Requires: iOS 16.4 · 29 MB
- Languages: American English
- Released: 2026-08-04
- Data updated: 2026-08-15
- User reviews in markdown: https://appshunter.io/ios/app/steady-reef/id6794359531/reviews.md

## What is Steady Reef?

Steady Reef is a dosing and water-parameter tracker built around one goal: holding your reef steady.

Most calculators answer "how much do I add to get from here to there, right now?" Steady Reef answers the question that actually keeps corals thriving: how much does YOUR tank use every day, and what is the standing dose that holds each parameter flat?

LEARNS YOUR TANK
Log your alkalinity, calcium and magnesium as you test. Steady Reef estimates your tank's real daily consumption from your own history and gives the maintenance dose that keeps each one on target — so you stop chasing swings.

CATCHES WHAT SINGLE-POINT CALCULATORS MISS
A built-in calcium-versus-alkalinity cross-check flags trouble a one-shot calculator can't: abiotic precipitation, a test kit that has drifted, or magnesium too low to hold the other two up.

EVERYTHING YOU NEED TO DOSE WITH CONFIDENCE
• Daily-demand dosing for alkalinity, calcium and magnesium
• Your own solutions — enter a stock recipe (compound, grams, volume) or a bottle's label claim, and dose in the millilitres you actually measure
• Salt-mix calculator with per-brand calibration
• Salinity conversions — ppt, specific gravity, conductivity
• Water-change planner
• History graphs for eight parameters — alkalinity, calcium, magnesium, salinity, nitrate, phosphate, temperature and pH — from one week to six months
• PDF reports and CSV export
• Multiple tanks grouped by site — ideal for a fish room or a service tech; export a single tank or an entire location
• Metric, US and UK units, set per parameter
• Light and dark mode

PRIVATE BY DESIGN
Everything stays on your device. No account, no sign-up, no sync, and not one network request anywhere in the app. Your tank history never leaves your phone.

BUILT ON REAL CHEMISTRY
Doses are derived from pure-compound stoichiometry rather than any single brand's chart, so they work with whatever you actually use. Steady Reef informs your dosing — it does not replace a test kit. Always confirm before relying on a dose long-term.

BUY ONCE, OWN IT
Steady Reef is a one-time purchase. No subscription, no ads, no in-app upsells, no account — just the full app, yours to keep, working entirely offline.

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


## Version history (last 1 release)

### 1.0 — 2026-08-04

No release notes.

## More apps by Lance Allan Perry

- [Muster Up: Group Trip Split](https://appshunter.io/ios/app/muster-up-group-trip-split/id6794845541)
- [Anchor: ADHD Daily Planner](https://appshunter.io/ios/app/anchor-adhd-daily-planner/id6795619008)
- [Verandah: Family Day Board](https://appshunter.io/ios/app/verandah-family-day-board/id6795765582)

All apps by Lance Allan Perry: https://appshunter.io/developer/6794359535

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*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 2026-08-15.*