ReefMate vs Reef Stability
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
ReefMate
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ReefMate is a reef and saltwater aquarium manager. Log tests, track water parameters and stay on top of maintenance so your tank stays stable. Set up your tank in minutes, log a water test or water change in seconds, and get clear insights, reminders and calculators in one clean app. Your tank data stays on your device. KEY FEATURES Guided Setup - Tell ReefMate your tank type, size and routine. It suggests parameter targets and a care schedule, and you can edit everything later. Home Dashboard & Quick Log - See today's tasks, a tank snapshot and a stability score at a glance. - Log a water test, water change or maintenance in seconds. Water Parameters Tracker - Track temperature, salinity, alkalinity (KH), calcium, magnesium, nitrate, phosphate and pH. - Range indicators show when a reading is in range or drifting outside it. - Charts and trends for day, week, month, 90-day and all-time views. - Set your own targets for each parameter. Tanks & Livestock - Create unlimited tanks, each with its own parameters and livestock. - Add fish, corals and invertebrates with photos and notes. - A per-tank timeline of water changes, maintenance and events. Reminders & Notifications - Stay consistent with water changes, KH checks, feedings, filter cleaning and more. - Custom reminders with repeat schedules and notifications. Smart Calculators & Costs - Tank volume, live rock, sand, flow rate, temperature and salinity (salt mix) calculators. - Expenses & Loss Tracking to monitor livestock costs, losses and long-term impact. Reef & Livestock Guide - 120+ species profiles across fish, corals and invertebrates. - Fish guides: Clownfish, Tangs, Angelfish, Gobies, Wrasses, Blennies and more. - Coral guides: SPS, LPS and soft corals such as Acropora, Montipora, Euphyllia, Zoanthids and Mushrooms. - Invertebrates: shrimp, crabs, snails, starfish and urchins. - Care tips, compatibility notes and lighting or flow preferences for each species. WHY REEFMATE? - Designed for iPhone and iPad, with light and dark appearance. - Your tank data stays on your device. - Helpful for beginners and experienced reefers alike. - Built by reef hobbyists, for reef hobbyists. SUBSCRIPTION INFORMATION ReefMate is a subscription app: an active subscription is required to use it. Plans: Monthly and Annual. Available plans, prices and any free-trial offer are shown in the app before you subscribe; trial length and eligibility may vary by plan. - Payment is charged to your Apple ID account at confirmation of purchase or, if a free trial is offered, when the trial ends. - Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. Your account is charged for renewal within 24 hours before the end of the current period. - Manage or cancel anytime in your Apple ID account settings (Settings > your name > Subscriptions). Any unused portion of a free trial is forfeited when you purchase a subscription. Privacy Policy: https://emkapps.com/reefmate-privacy-policy/ Terms & Conditions: https://emkapps.com/reefmate-termsconditions/ Apple Standard End User License Agreement: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Reef Stability
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Reef Stability turns your own test results into the two things every reef keeper actually needs: how much to dose, and when to leave the tank alone. Log your alkalinity, calcium, magnesium and nutrients, and Reef Stability learns how fast your tank uses each one. Then it works out the daily dose to hold it steady โ from your data, not a generic chart. When a wobble is just test-kit noise, it says so, instead of sending you chasing a number. WHAT IT DOES - Know what to change โ a daily dose from your own tank's measured uptake - Stability first โ it tells you when to do nothing - Every parameter on one clean screen: alkalinity, calcium, magnesium, nitrate, phosphate, salinity, temperature, pH - Trends that filter out test-kit scatter, so you see real drift - Safe by design โ dose changes stay within reef-safe daily limits, with extra caution for SPS - Honest by design โ sourced chemistry, and it never invents a number it can't stand behind - Your data is yours โ full history and CSV export, free, forever - No account, no sign-up โ your logs stay on your device FREE Log, track and export everything โ free, with no time limit. REEF STABILITY PREMIUM Unlocks the dose recommendations, supplement forecasting and cross-parameter interpretation. Available monthly, annually, or as a one-time lifetime purchase. Stability over chasing numbers. --- Privacy Policy: https://reefstability.com/privacy Terms of Use: https://reefstability.com/terms Subscriptions are billed to your Apple ID. An auto-renewing subscription renews unless cancelled at least 24 hours before the end of the current period; manage or cancel anytime in your App Store account settings. A lifetime purchase is a one-time payment.
Screenshots
Verdict
The clearest difference is update cadence: Reef Stability at weekly against ReefMate's every 5 weeks. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. ReefMate sells 2 in-app purchases, starting at $4.99 per month and Reef Stability sells 3 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.
ReefMate ships an update every 5 weeks, Reef Stability weekly. The most recent releases landed on October 26, 2026 and October 11, 2026 respectively.
| Parameter | ReefMate | Reef Stability |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 5 weeks | Weekly โ better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad โ better | iPhone |
| Requires iOS | 17.0 โ better | 18.0 |
| Further details โ not scored | ||
| Size | 133 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | Mustafa Kulac | YUSUF AYDIN |
In-app purchases
ReefMate
- Monthly$4.991 Month
- Annual7 Days trial$34.991 Year
Reef Stability
- Premium Monthly$6.991 Month
- Premium Annual$39.991 Year
- Premium Lifetime$89.99









