AquaticLog vs ReefLynk
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
AquaticLog
Manage your aquarium with this comprehensive platform. Track water parameters, schedule maintenance, log livestock, and document your tank's progress with photos and videos. Connect controllers for automatic data import and sync across devices.
- Water parameter tracking
- Smart reminders for maintenance
- Livestock management
- Equipment and dosing logs
- Controller integration
- Photo and video diary
- Community features
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AquaticLog keeps water parameters, livestock, equipment and care routines together for every freshwater tank and reef. ONE ACCOUNT, EVERY DEVICE Your log lives in your AquaticLog account, not on your phone. Sign in on a new iPhone, an iPad or the web at aquaticlog.com and everything is already there. Aquarists have trusted AquaticLog with their records for over 13 years. Keep your tanks on the iPhone Home Screen with widgets. WATER PARAMETERS Log pH, temperature, ammonia, nitrite, nitrate, phosphate, salinity, alkalinity, calcium, magnesium and more. Clear trend charts let you catch a swing before it reaches your fish or corals. Connect a Neptune Apex, Hydros, AquaWiz or Seneye for hourly readings, including Seneye NH3 and NH4. Delete bad readings in batches and schedule retests for out-of-range results. LIVESTOCK AND PLANTS Build a detailed record of every fish, coral, invertebrate, plant and amphibian you own. Add a photo as you add a new fish or coral. Track sex, temperament, diet, difficulty and reef-safety, and move inhabitants between tanks as your collection grows. Tank birthdays and gotcha days share a card you can dismiss. MAINTENANCE MADE SIMPLE Schedule water changes, dosing, feeding, testing and equipment cleaning. Smart reminders make sure nothing slips. Check off a task and it lands with a haptic; once nothing is due, your tank shows what's next. A daily streak beside Reminders rewards showing up. End a repeating schedule on a date or after a set count, and see your maintenance time per week. Service accounts can start client visits and finish them with notes and next-visit plans. DOSING AND FEEDING Track dosing and feeding with a precise history. Log feeding every 48 hours or at another fixed interval. Re-dose additives, repeat feedings and repeat water changes in one tap, prefilled with your last amounts. Repeated doses and feedings fold into one row per day. FISH ROOM AND WATER CHANGES Set up RO/DI with SpectraPure, BRS and Waterbox presets. Track filter changes and TDS for each membrane and DI stage. Manage supplies and spending in Fish Room, with INR support. PHOTO TIMELINE Track growth and coloration. Then vs Now slides between your first photo and your latest, with dates and tank age. Pinch to zoom. Start a build thread for your tank on the community forum and post what changed as it grows. ADVANCED TESTING Log ICP analyses and PAR readings. ICP warnings stay grouped; dismiss individual results and restore them anytime. Share test-kit reagents across tanks in Fish Room: logged tests count supplies down, with fill levels and days left. EQUIPMENT Track pumps, lights and filters, with ratings and reviews. Browse products by category or brand, see which tanks use them, and add them to your tank or shopping list. A spending report totals what you've paid per store, filterable by tank and date range (Pro). EXPLORE AND CONNECT Search public tanks by what lives in them — look for a torch coral in the 15-30 gallon range and see how other nano reefs are scaped. Filter by style (mixed reef, SPS, LPS, soft coral, planted, macro algae, fish only), size, water type and activity, then open any tank to see its photos, parameters, gear and livestock. Find Today, Aquariums, Species, Products and News together in Explore. Read reviews, like photos and earn achievements. Make your tank public to share its link, or copy a snapshot of its parameters, livestock and gear to ask for advice. Available in English, German, Spanish, French, Italian, Dutch, Polish, Russian, Ukrainian and Brazilian Portuguese. Start for free — new accounts log water parameters without limits for 30 days — then upgrade to Pro for advanced tracking and tools. The yearly plan starts with a 7-day free trial. Get daily AI suggestions based on tank data and see when each was generated. Privacy Policy: https://www.aquaticlog.com/privacy Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
ReefLynk
Manage your reef aquarium with this comprehensive app. Track water parameters, schedule maintenance, and catalog your livestock with photos. Syncs across devices and offers email reminders to keep your tank healthy.
- Water parameter tracking
- Maintenance scheduling
- Livestock cataloging
- Real-time device sync
- Email reminders
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ReefLynk is the all-in-one reef aquarium management app built for serious reefers. WATER PARAMETER TRACKING Log temperature, pH, alkalinity, calcium, magnesium, ORP, ammonia, nitrate, nitrite, and phosphate. View trends over time with interactive charts so you can spot problems before they become disasters. MAINTENANCE SCHEDULING Create recurring tasks — water changes, filter cleaning, dosing — with customizable frequencies. Get reminders so nothing slips through the cracks. LIVESTOCK MANAGEMENT Catalog your fish, corals, and invertebrates. Track species, quantity, and health status with photos. REAL-TIME SYNC Your data syncs instantly across all your devices. Log on your phone, review on your tablet. EMAIL REMINDERS Opt in to email notifications for upcoming maintenance tasks so you never miss a water change, even when you're away from your phone. Keeping a reef tank healthy requires consistency. ReefLynk replaces spreadsheets, sticky notes, and forgotten reminders with a single app designed specifically for reefers.
Screenshots
Verdict
The clearest difference is rating: ReefLynk at 5.0 against AquaticLog's 4.2. ReefLynk also leads on review sentiment (100% vs 70%) and update cadence (daily vs every 10 days). AquaticLog's advantage is ratings volume (407 vs 2). On price, ads, in-app purchases and monetization model 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
Both are free to download. AquaticLog sells 3 in-app purchases, starting at $4.99 per month and ReefLynk sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.
ReefLynk holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: AquaticLog has 407 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 70% of AquaticLog's written reviews are positive against 100% of ReefLynk's.
AquaticLog ships an update every 10 days, ReefLynk daily. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.
| Parameter | AquaticLog | ReefLynk |
|---|---|---|
| Price | Free | Free |
| Rating | 4.2 (407 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 69.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 407 — better | 2 |
| Update frequency | Every 10 days | Daily — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium | Freemium |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.1 | 15.0 — better |
| Further details — not scored | ||
| Size | 25 MB | 22 MB |
| Age rating | 4+ | 4+ |
| Developer | Lonnex Inc | MICHAEL KARL TAYLOR |
Customer experience
AquaticLog
ReefLynk
In-app purchases
AquaticLog
- Pro Monthly Subscription$4.991 Month
- Pro Yearly Membership7 Days trial$39.991 Year
- Pro Lifetime Membership$149.99
ReefLynk
- ReefLynk Pro$2.991 Month
- ReefLynk Pro Yearly$29.991 Year








