Comparison

MOAI® vs Reef Diary Aquarium Management

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

Head to head
About

MOAI®

Features
Read full description

MOAI® is a robotic aquarium video monitoring and glass cleaning system. MOAI is designed to help aquarists spend more time enjoying aquarium and spend less time maintaining aquarium. MOAI mobile app allows you to control your robot remotely using a smartphone – at home, or on the move. YOUR PARTNER FOR A CLEANER AQUARIUM · Control MOAI and set a buffer above sand bed to avoid scratches. · Start, stop and schedule cleaning sessions when convenient for you. · Your robot will stay up to date with firmware updates. YOUR AQUARIUM ON YOUR PHONE · Explore your underwater world with 24/7 live streaming, from anywhere on the planet. · Unlock unique video monitoring experience designed just around aquarium. Save favorite location, switch between Spot and Cruise modes, turn on fill light, adjust exposure compensation, choose a blue light filter, and share with friends. · With camera control in the palm of your hand, peace of mind is yours. REQUIREMENTS: MOAI only support Wi-Fi® networks with 2.4GHz band

About

Reef Diary Aquarium Management

Manage your reef or freshwater aquarium with this comprehensive tool. Track water parameters, schedule maintenance, and monitor your aquatic life and equipment. Works offline to keep your ecosystem healthy and thriving.

Highlights
  • Smart parameter tracking for reef and freshwater
  • Visual trend charts for water parameters
  • Multiple tank support
  • Equipment and livestock inventory
  • Maintenance task scheduler with reminders
  • Offline functionality
Features
Read full description

ReefDiary helps reef keepers stay organized, spot changes earlier, and build better care habits for saltwater aquariums. Whether you are maintaining your first nano reef or managing a mature mixed reef, ReefDiary gives you a calm, structured place to record what matters and understand how your aquarium is doing over time. Log key water parameters such as temperature, salinity, pH, alkalinity, calcium, magnesium, nitrate, phosphate, and more. Keep your test history organized so you can review trends instead of relying on memory or scattered notes. Create maintenance tasks for water changes, filter cleaning, dosing, feeding, testing, equipment checks, livestock care, and recurring routines. ReefDiary helps you keep track of what needs attention so important aquarium care does not slip through the cracks. Manage livestock with dedicated records for fish, coral, invertebrates, and other reef inhabitants. Add names, species details, care notes, purchase dates, observations, and status updates so your tank history stays easy to follow. Use the dashboard to get a quick overview of your reef. See recent activity, upcoming tasks, current health signals, and the information you need most when checking in on your aquarium. Review analytics and health insights to better understand your tank’s stability. ReefDiary turns your logs into useful patterns so you can notice parameter swings, track progress, and make more confident reef keeping decisions. Record observations, changes, and important events as they happen. Add notes after testing, dosing, livestock additions, equipment changes, coral placement, or unusual behavior so you always have context for future decisions. ReefDiary is designed for hobbyists who want less guesswork and more consistency. Instead of jumping between spreadsheets, reminders, notebooks, and photos, you can keep your reef diary in one dedicated place built around aquarium care. Use ReefDiary to: Track water test results over time Monitor aquarium health and stability Plan and complete maintenance tasks Keep livestock records organized Record dosing, feeding, and care notes Review trends and recent changes Build a reliable history of your reef Stay consistent with routine tank care Reef keeping rewards patience, observation, and consistency. ReefDiary helps support those habits by making it easier to document your tank, understand what changed, and stay ahead of maintenance. Start building a clearer history of your reef today with ReefDiary. reefdiary.io SUBSCRIPTIONS MoneyDiary Pro Monthly • 1-month auto-renewable subscription • Price is displayed in your local currency before purchase. MoneyDiary Pro Yearly • 1-year auto-renewable subscription • Price is displayed in your local currency before purchase. MoneyDiary Enterprise Monthly • 1-month auto-renewable subscription • Price is displayed in your local currency before purchase. MoneyDiary Enterprise Yearly • 1-year auto-renewable subscription • Price is displayed in your local currency before purchase. Payment will be charged to your Apple Account at confirmation of purchase. Subscriptions automatically renew unless cancelled at least 24 hours before the end of the current billing period. Your account will be charged for renewal within 24 hours prior to the end of the current period. You can manage or cancel your subscriptions at any time in your App Store Account Settings. Privacy Policy: https://moneydiary.io/privacy Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

MOAI®4 screens
Reef Diary Aquarium Management4 screens

Verdict

The call

The clearest difference is in-app purchases: MOAI® at none against Reef Diary Aquarium Management's 4. MOAI® also leads on iOS requirement (9.0 vs 15.1). Reef Diary Aquarium Management's advantage is update cadence (every 5 weeks vs every 10 months) and device support (4 vs 2). 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 Diary Aquarium Management sells 4 in-app purchases, starting at $2.99 per month. MOAI® asks for nothing beyond the download.

UpkeepUpdate frequency

MOAI® ships an update every 10 months, Reef Diary Aquarium Management every 5 weeks. The most recent releases landed on September 12, 2026 and September 3, 2026 respectively.

Scorecard4 real differences · 6 level
MOAI® versus Reef Diary Aquarium Management: the parameters behind the verdict, then further details
ParameterMOAI®Reef Diary Aquarium Management
PriceFreeFree
Rating—1.0 (1 ratings) — better
Positive reviews—0.0% of reviews
Number of ratings—1 — better
Update frequencyEvery 10 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Freemium
DevicesiPhone, iPodiPhone, iPad, iPod, Apple Watch — better
Requires iOS9.0 — better15.1
Further details — not scored
Size51 MB57 MB
Age rating4+4+
DeveloperSZ MOAI TECHNOLOGY CO., LTDChristian Buchholz

In-app purchases

None

MOAI®

No in-app purchases

4 purchases

Reef Diary Aquarium Management

Subscriptions4
  • Reef Diary - Monthly$2.991 Month
  • Reef Diary - Yearly$24.991 Year
  • Enterprise Monthly Subscription$89.991 Month
Show 1 more
  • ReefDiary Yearly Enterprise$699.001 Year

Questions

Is MOAI® free?
MOAI® is free to download, with no in-app purchases.
Is Reef Diary Aquarium Management free?
Reef Diary Aquarium Management is free to download, with in-app purchases available.
Do MOAI® or Reef Diary Aquarium Management have ads?
Neither MOAI® nor Reef Diary Aquarium Management shows ads.
Which is updated more often, MOAI® or Reef Diary Aquarium Management?
MOAI® ships an update every 10 months, and Reef Diary Aquarium Management every 5 weeks. Most recently, MOAI® was updated on September 12, 2026 and Reef Diary Aquarium Management on September 3, 2026.

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