Comparison

Reef Buddy vs Senrium

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

Head to head
About

Reef Buddy

Easily log, monitor, and analyze your saltwater aquarium's critical parameters. Get smart insights and personalized advice to maintain a healthy reef tank. Syncs across devices and offers guidance for manual test results.

Highlights
  • Log critical aquarium parameters
  • Monitor KH, salinity, pH, Ca, Mg, and more
  • Analyze data with automated insights
  • Sync data across iPhone and iPad
  • Guidance for manual test kit results
  • Personalized advice with premium subscription
Features
Read full description

Reef Buddy – Track Your Reef Tank With Confidence Reef Buddy is the reef tracker and water test log built for saltwater tank and saltwater aquarium keepers. Log water tests, monitor parameter trends, and understand what is changing in your reef before small swings become real problems. Track Every Essential Reef Parameter Record KH, salinity, pH, Ca, Mg, NO₂, NO₃, PO₄, SiO₂, temperature, and more. Keep a clear aquarium log with visual trends for the values reef keepers watch most. Smart Insights for Saltwater Aquariums Get automated insights from your measurements so you can react earlier, keep your reef tank stable, and make better maintenance decisions. Sync Across Devices All your data is safely stored and automatically synced across your iPhone and iPad. Manual Test Help Enter results from your favorite test kits faster with guided steps designed for reef routines, regular water tests, and day-to-day reef journaling. Unlock Premium with Shrimpy Shrimpy, your reef assistant, unlocks powerful features: • Expert analysis of your tank data • Personalized advice • Photo analysis of your aquarium • Ability to ask questions and get reefing tips Why Reef Keepers Choose Reef Buddy • Built for reef tanks and saltwater aquariums • Clean tracking without unnecessary clutter • Compatible with major test kits, including Red Sea, Salifert, Hanna, and more Subscription Info Shrimpy Premium is available as a monthly or yearly subscription. Payment will be charged to your iTunes account at confirmation of purchase. Subscriptions auto-renew unless cancelled 24 hours before the end of the period. Manage your subscription anytime in your Apple account settings. Terms & Privacy Policy: https://reef-buddy.app

About

Senrium

Read full description

The Senrium app enables mobile devices to connect with a variety of sensor products, offering real-time monitoring of critical aquarium parameters that can swiftly change during emergencies. Currently, the Senrium offers the H1 Aquarium Monitor, which safeguards both you and your aquarium against equipment failures like malfunctioning heaters, chillers, pumps, filters, or leaks. Unlike expensive, cumbersome, and intricate aquarium controllers, Senrium simplifies the setup process: just place the sensor in your tank and define your limits. Senrium will promptly alert you when your aquarium requires attention.

Screenshots

Reef Buddy4 screens
Senrium4 screens

Verdict

The call

The clearest difference is ads: Reef Buddy at none against Senrium's shown. Reef Buddy also leads on update cadence (every 2 weeks vs every 6 weeks). Senrium's advantage is iOS requirement (15.6 vs 26.0). On price, in-app purchases and device support 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 Buddy sells 4 in-app purchases, starting at $0.99 per 7 days and Senrium sells 3 in-app purchases, starting at $2.49 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Reef Buddy ships an update every 2 weeks, Senrium every 6 weeks. The most recent releases landed on September 20, 2026 and September 16, 2026 respectively.

Scorecard3 real differences · 7 level
Reef Buddy versus Senrium: the parameters behind the verdict, then further details
ParameterReef BuddySenrium
PriceFreeFree
Rating4.1 (19 ratings) — better—
Positive reviews60.0% of reviews—
Number of ratings19 — better—
Update frequencyEvery 2 weeks — betterEvery 6 weeks
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFreemium—
DevicesiPhone, iPad, MaciPhone, iPad, iPod
Requires iOS26.015.6 — better
Further details — not scored
Size44 MB64 MB
Age rating4+4+
Developermaxime marinelSamuel Steele

In-app purchases

4 purchases

Reef Buddy

Subscriptions4
  • Reef Buddy Pro Weekly$0.997 Days
  • Reef Buddy Pro3 Days trial$1.991 Month
  • Reef buddy pro month$3.991 Month
Show 1 more
  • Reef buddy pro annual3 Days trial$44.991 Year
3 purchases

Senrium

Subscriptions3
  • Single Aquarium (Monthly)$2.491 Month
  • Mutli (Monthly)$3.991 Month
  • +Pro (Monthly)$14.991 Month

Questions

Is Reef Buddy free?
Reef Buddy is free to download, with in-app purchases available.
Is Senrium free?
Senrium is free to download, with in-app purchases available.
Do Reef Buddy or Senrium have ads?
Senrium shows ads; Reef Buddy does not.
Which is updated more often, Reef Buddy or Senrium?
Reef Buddy ships an update every 2 weeks, and Senrium every 6 weeks. Most recently, Reef Buddy was updated on September 20, 2026 and Senrium on September 16, 2026.

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