Comparison

TankDiary vs AquaSense.fish

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

Head to head
About

TankDiary

Features
Read full description

Track your aquarium's water quality and never miss a maintenance day. Simple, focused, and built for every type of tank — freshwater, planted, saltwater, or outdoor. 【Log Your Water Quality】 Record pH, temperature, GH, KH, ammonia, nitrite, and nitrate. Add up to 5 custom parameters. Your last reading is shown as a hint while you type, so entry is fast. 【Visualize Trends】 See parameters on a clean graph over 7, 30, 90 days, or all time — with the ideal range highlighted so you can spot problems at a glance. (30-day+ graphs require Pro) 【Maintenance Reminders】 Set repeating tasks for water changes, feeding, fertilizing, filter cleaning, CO2 refills, and more. The home screen shows "next maintenance in X days" for every tank. 【Reagent Timer】 Built-in 2, 5, and 10-minute countdowns — no more guessing when your test kit is ready. 【CSV / ZIP Export & Import — Free】 Export water records as CSV, or back up tanks, photos, logs, and schedules as a ZIP. Import the same files anytime — free for everyone. 【TankDiary Pro — One-Time Purchase】 • Register more than one tank • View graphs beyond 7 days (30 / 90 / all-time) No subscription. No recurring fees. Ever. 【Perfect for every tank】 Freshwater, planted, reef, goldfish, shrimp, outdoor ponds — TankDiary works with any setup. Especially useful if you've ever: • Lost fish from a missed water change • Struggled to keep water parameters stable • Wanted an easier alternative to spreadsheets • Been managing multiple tanks (Corydoras, guppies, discus, goldfish, cichlids, shrimp...) 【Your data stays with you】 All records are stored on your iPhone or iPad. No cloud sync. No account required. 【No special hardware needed】 Works with any test kit or test strips. Just enter your readings manually. 【Pricing】 • Free: 1 tank, 7-day graphs, CSV/ZIP export & import, core features — free forever • TankDiary Pro (one-time, no subscription): multiple tanks, long-term graphs --- Developer: Kore Apps Support: support@kore-apps.com ---

About

AquaSense.fish

This app helps you maintain healthy aquariums by monitoring water parameters, identifying fish from photos, and providing compatibility information. It offers tools for planning tank setups, tracking livestock, and logging maintenance, with AI-powered guidance for both freshwater and saltwater tanks.

Highlights
  • Water parameter monitoring (pH, ammonia, etc.)
  • Photo-based fish identification
  • Livestock compatibility checker
  • Species library with care requirements
  • Tank build planning tool
  • Maintenance logging and reminders
  • AI-powered care guidance
Features
Read full description

AquaSense is the all-in-one companion for keeping a healthy freshwater or saltwater aquarium. Whether you run a nano reef, a planted community tank, or a big cichlid setup, AquaSense turns guesswork into clear, confident care. YOUR TANK'S HEALTH AT A GLANCE See pH, ammonia, nitrite, nitrate, KH, salinity and more the moment you open the app. Every reading is checked against the ideal range for your water type and livestock, so you instantly know what's fine and what needs attention. IDENTIFY ANY FISH FROM A PHOTO Not sure what you're looking at — at the store or in your own tank? Snap a photo and AquaSense identifies the species, then tells you how to care for it. KNOW WHAT LIVES WELL TOGETHER Before you add a new fish, check it against everything already in your tank. AquaSense flags aggression, size mismatches, and other conflicts so you avoid costly mistakes. TRACK EVERY FISH YOU KEEP Build a livestock list for each tank, with care levels, temperament, and notes. Tap any fish for a full species profile. A DEEP, TRUSTED SPECIES LIBRARY Browse a growing library of freshwater and saltwater species with real care requirements — temperature, parameters, diet, tank size, and compatibility. PLAN BEFORE YOU BUY Sketch out a tank build — water type, size, filtration, and stocking — and see whether it works before you spend a cent. CARE TOOLS BUILT IN Log water changes and maintenance, set reminders, and get AI-powered guidance tailored to your specific tank. AQUASENSE PRO Upgrade to Pro for unlimited photo fish ID, the full AI assistant, and advanced care insights. Subscriptions are billed through your app store account and can be managed or canceled anytime in your account settings. Freshwater or saltwater, beginner or expert — AquaSense helps you keep your fish healthy and your water right. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://aquasense.fish/privacy

Screenshots

TankDiary4 screens
AquaSense.fish4 screens

Verdict

The call

The clearest difference is in-app purchases: AquaSense.fish at none against TankDiary's 1. On price, update cadence, 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

Both are free to download. TankDiary sells 1 one-off in-app purchase. AquaSense.fish asks for nothing beyond the download.

UpkeepUpdate frequency

TankDiary ships an update every 6 days, AquaSense.fish every 5 days. Both last shipped on October 24, 2026.

Scorecard1 real difference · 9 level
TankDiary versus AquaSense.fish: the parameters behind the verdict, then further details
ParameterTankDiaryAquaSense.fish
PriceFreeFree
Rating—4.3 (3 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—3 — better
Update frequencyEvery 6 daysEvery 5 days — better
AdsNoNo
In-app purchasesYesNo — better
Monetization—Freemium
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.0 — better15.1
Further details — not scored
Size55 MB54 MB
Age rating4+17+
Developerkazuki korenoriBRYCE SCOTT SMITH

In-app purchases

1 purchases

TankDiary

One-time1
  • TankDiary Pro$5.99
None

AquaSense.fish

No in-app purchases

Questions

Is TankDiary free?
TankDiary is free to download, with in-app purchases available.
Is AquaSense.fish free?
AquaSense.fish is free to download, with no in-app purchases.
Do TankDiary or AquaSense.fish have ads?
Neither TankDiary nor AquaSense.fish shows ads.
Which is updated more often, TankDiary or AquaSense.fish?
TankDiary ships an update every 6 days, and AquaSense.fish every 5 days. Most recently, TankDiary was updated on October 24, 2026 and AquaSense.fish on October 24, 2026.

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