Comparison

HYDROS App vs Reef Stability

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

HYDROS App

Easily monitor and control your aquarium's vital parameters like temperature, pH, and salinity. Manage all your connected devices, including ATOs, lights, and pumps, with a user-friendly interface. Quick setup with preset configurations means no coding is required to get your system running.

Highlights
  • Monitor temperature, ORP, pH, salinity
  • Control ATO, lights, heaters, pumps
  • User-friendly interface
  • Quick setup with presets
  • Manage multiple devices and aquariums
  • Set schedules and create modes
Features
Read full description

Use the CoralVue HYDROS App to control and monitor HYDROS aquarium devices from your smartphone or tablet. The user-friendly interface allows you to easily monitor your aquarium's temperature, ORP, pH, alkalinity levels, salinity, and more. With just one tap, you can control your ATO, lights, heaters, pumps, skimmer, calcium reactor, RO/DI units, etc. Setup is quick and easy! With 18+ different preset configurations and growing, it will take only minutes to get all of your equipment set up and running, with no coding required. SUPPORTED DEVICES: -HYDROS Control X2, X4, XS, XD, X3, X4, XP8, X10 -HYDROS Kraken -HYDROS Minnow -HYDROS Launch -HYDROS WaveEngine, WaveEngine LT -IceCap Gyre Dual Pump WiFi Controller DISCOVER MORE: -Intuitive interface features multiple view options such as tile, text, or graph -Adjust your view settings to light mode, dark mode, or auto, which will automatically adjust to your mobile device's settings -Ability to manage multiple HYDROS devices and aquariums from one single-screen -Monitor and control WiFi outlets -Set schedules and create modes -Archive controller settings STAY CONNECTED We welcome you to join our HYDROS community at forum.coralvuehydros.com where you can ask questions, learn more about your HYDROS devices, and connect with other aquatic hobbyists like yourself.

About

Reef Stability

Features
Read full description

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 — 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 — a daily dose from your own tank's measured uptake - Stability first — 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 — dose changes stay within reef-safe daily limits, with extra caution for SPS - Honest by design — sourced chemistry, and it never invents a number it can't stand behind - Your data is yours — full history and CSV export, free, forever - No account, no sign-up — your logs stay on your device FREE Log, track and export everything — 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

HYDROS App3 screens
Reef Stability4 screens

Verdict

The call

The clearest difference is in-app purchases: HYDROS App at none against Reef Stability's 3. HYDROS App also leads on device support (3 vs 1) and iOS requirement (15.6 vs 18.0). Reef Stability's advantage is update cadence (weekly vs every 3 months). On price and ads there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Reef Stability sells 3 in-app purchases, starting at $6.99 per month. HYDROS App asks for nothing beyond the download.

UpkeepUpdate frequency

HYDROS App ships an update every 3 months, Reef Stability weekly. The most recent releases landed on September 30, 2026 and September 9, 2026 respectively.

Scorecard4 real differences · 6 level
HYDROS App versus Reef Stability: the parameters behind the verdict, then further details
ParameterHYDROS AppReef Stability
PriceFreeFree
Rating3.7 (22 ratings) — better—
Positive reviews62.3% of reviews—
Number of ratings22 — better—
Update frequencyEvery 3 monthsWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.6 — better18.0
Further details — not scored
Size70 MB9 MB
Age rating4+4+
DeveloperCoralvueYUSUF AYDIN

In-app purchases

None

HYDROS App

No in-app purchases

3 purchases

Reef Stability

Subscriptions2
  • Premium Monthly$6.991 Month
  • Premium Annual$39.991 Year
One-time1
  • Premium Lifetime$89.99

Questions

Is HYDROS App free?
HYDROS App is free to download, with no in-app purchases.
Is Reef Stability free?
Reef Stability is free to download, with in-app purchases available.
Do HYDROS App or Reef Stability have ads?
Neither HYDROS App nor Reef Stability shows ads.
Which is updated more often, HYDROS App or Reef Stability?
HYDROS App ships an update every 3 months, and Reef Stability weekly. Most recently, HYDROS App was updated on September 30, 2026 and Reef Stability on September 9, 2026.

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