Comparison

Reefability vs Entropy Alarm

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

Head to head
About

Reefability

This AI-powered app offers scientific precision for managing coral reef aquariums. It analyzes microbiome health, water chemistry, and light optimization, and can identify issues from tank photos. It provides tools for hobbyists and professionals to maintain thriving reef ecosystems.

Highlights
  • AI-driven analysis of reef tank health
  • Smart photo diagnostics for issue identification
  • Evidence-based solutions and recommendations
  • Ecosystem stability insights
  • Professional tools for reef stores and professionals
  • Integrated parameter monitoring
Features
Read full description

The reef app that sees your whole tank. Reefability connects your chemistry, livestock, light, flow, microbiome and dosing, so every answer takes your entire reef into account. Built for reef tanks only, by reefers who did the research first. Reefability was the first AI-powered reef aquarium app, and it has now been rebuilt from the ground up as Reefability Symbiosis. YOUR TANK, BUILT RIGHT Guided tank setup, drawn live as you go, with the true water volume after sand and rock Cycling mode and Quarantine mode, each with the tools that stage needs Farm and grow-out tanks, plus connected systems that share one body of water REEF MAP Turn one front photo into a 3D model of your real rockwork Place your lights and pumps, then tap any spot for estimated PAR and flow Every coral is graded against the light and flow where it actually sits CHEMISTRY AND NUTRIENTS Log readings by voice, by photo of your test kit, or from your controller Upload ICP and DOC lab reports and see risks and trends on the same charts Ideal ranges that follow your tank, so a soft coral reef isn't held to SPS numbers See whether your filtration keeps up with your bioload, and which method does the work DOSING 400+ supplements from 27 brands, with strengths taken from each maker's label Dose suggestions based on your latest test and your water volume Connected dosers, bottle tracking and reminders Captiv8, Triton, Red Sea and Modern Reef dosing methods LIVESTOCK AND CORALS Add animals by name, by photo, or by scanning your store receipt Care sheets for 500+ species, with bioload and tankmate warnings before you buy Coral Growth: a photo every two weeks tracks size, pace and color over time Compatibility reports that show what to expect before you add an animal PESTS AND MICROBIOME Identify pests from photos, pin them on your 3D tank, and follow them until they're gone A microbiome care score, with guided recovery after medication or a deep clean SAFETY PLANS Weather and air quality alerts for your area, turned into prep lists sized for your tank Smoke warnings if your skimmer pulls in outdoor air Know how many hours your pumps will run on backup power PEOPLE AROUND YOUR REEF Sitter mode: give a sitter a simple code, daily tasks and a help button Experts: book a video call with a reef expert who sees your tank data ahead of time Reefers: share your tank, ask the community and join testing challenges FOR STORES, FARMS AND MAINTENANCE COMPANIES Team mode: manage staff with their own access codes, assign tasks per tank, and keep client tank details and routes in one place REEFER AI An assistant that reads your entire tank, not just one number Charts on demand when numbers need a picture Talk out loud when your hands are wet, and leave voice notes CONNECTED Works with reef controllers and test devices, including Neptune Apex, GHL, Red Sea, CoralVue Hydros, Aquarino, Jabao, Focustronic, Aquawiz and Xepta. Available in multiple languages.

About

Entropy Alarm

This alarm app automatically manages your alarms, clearing them when no longer needed. It offers three distinct alarm types to keep your list organized and includes features for travel, holidays, and custom sounds. Live Activities and widgets provide at-a-glance information.

Highlights
  • Self-clearing alarms
  • Burner, Frozen, and Crystallized alarm types
  • Follow me and Stay put travel modes
  • Holiday and custom day off skipping
  • Live Activities and Home Screen widget
  • Siri and Shortcuts integration
Features
Read full description

Meet an alarm app that knows when to get out of the way. Entropy Alarm was built by a developer with ADHD who wanted to create an alarm app for those who use alarms when a calendar or reminder app won't do. Entropy Alarm creates alarms that show up when you need them and clear themselves from your list, automatically, when you no longer need them! Entropy Alarm is a different kind of alarm clock, built around three alarm types so your list stays honest. Set something once and let it disappear. Repeat on a schedule until a date you choose. Or keep a routine that stays put until you delete it. Three alarm types: * Burner: a one-time alarm that deletes itself after you stop it * Frozen: a repeating alarm with a thaw date. It fires through that last day, then burns away * Crystallized: a permanent routine that repeats until you delete it Travel and time off: * Follow me keeps the same local time when you travel * Stay put keeps the alarm in its home time zone Alarms that ring only when you want or need them to * Skip holidays on Frozen and Crystallized alarms, with calendars for the US, UK, Canada, Australia, Germany, Spain, Mexico, and France * Add your own days off, like PTO or a birthday Sounds and extras: * Choose from built-in ringtones or import your own audio from Files * Snooze from 1 to 30 minutes, or turn it off * Live Activities show your snooze countdown on the Lock Screen and Dynamic Island * A Home Screen widget keeps your next alarm in sight * Siri, Shortcuts, and Control Center can start a new Burner, Frozen, or Crystallized alarm Make it yours: * Name alarms and give them an emoji * Pick a look: Basic, Bold, Dramatic, Frosted, or Burnout * Light, dark, or follow your device theme * 12-hour or 24-hour time Keep track: * Logs show what burned, thawed, snoozed, and fired * Stats and achievements if you like a little extra spark Entropy Alarm uses Apple's AlarmKit so alarms can still ring through Focus and Silent mode, the same way Clock alarms do. A short welcome walkthrough explains the three alarm types, and you can replay it anytime from the Profile tab. No ads. No in-app purchases. Your alarms stay on locally your device.

Screenshots

Reefability4 screens
Entropy Alarm4 screens

Verdict

The call

The clearest difference is price: Reefability at Free against Entropy Alarm's $2.99. Reefability also leads on ratings volume (34 vs 1) and update cadence (every 2 days vs every 5 days). Entropy Alarm's advantage is rating (5.0 vs 3.0) and in-app purchases (none vs 9). On ads 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

Reefability is free to download; Entropy Alarm costs $2.99 up front. Reefability sells 9 in-app purchases, starting at $9.99 per month. Entropy Alarm asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Entropy Alarm holds the better App Store score, 5.0 against 3.0. That said, the two scores are not equally well evidenced: Reefability has 34 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Reefability ships an update every 2 days, Entropy Alarm every 5 days. The most recent releases landed on October 15, 2026 and October 9, 2026 respectively.

Scorecard7 real differences · 3 level
Reefability versus Entropy Alarm: the parameters behind the verdict, then further details
ParameterReefabilityEntropy Alarm
PriceFree — better$2.99
Rating3.0 (34 ratings)5.0 (1 ratings) — better
Positive reviews34.4% of reviews—
Number of ratings34 — better1
Update frequencyEvery 2 days — betterEvery 5 days
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPad, Apple Watch
Requires iOS15.0.0 — better26.1
Further details — not scored
Size89 MB9 MB
Age rating4+4+
DeveloperReefabilityMark Garcia

Customer experience

Reefability

All ratings34 ratings
Positive47.1%
Neutral2.9%
Negative50.0%
Written reviews32 reviews
Positive34.4%
Neutral12.5%
Negative53.1%

Entropy Alarm

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

9 purchases

Reefability

Subscriptions4
  • 1-Month2 Months trial$9.991 Month
  • Controller plan (monthly)$11.991 Month
  • 12-Month$34.991 Year
Show 1 more
  • Controller plan (annual)$49.991 Year
One-time5
  • Day pass$1.99
  • 5 tank rebuilds$2.99
  • Week pass$4.99
Show 2 more
  • 15 tank rebuilds$6.99
  • Month pass$12.99
None

Entropy Alarm

No in-app purchases

Questions

Is Reefability free?
Reefability is free to download, with in-app purchases available.
Is Entropy Alarm free?
Entropy Alarm costs $2.99, with no in-app purchases.
Which has better reviews, Reefability or Entropy Alarm?
Entropy Alarm is rated higher. Reefability averages 3.0 out of 5 from 34 ratings, while Entropy Alarm averages 5.0 from 1 ratings.
Do Reefability or Entropy Alarm have ads?
Neither Reefability nor Entropy Alarm shows ads.
Which is updated more often, Reefability or Entropy Alarm?
Reefability ships an update every 2 days, and Entropy Alarm every 5 days. Most recently, Reefability was updated on October 15, 2026 and Entropy Alarm on October 9, 2026.

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