TankDiary vs AquaSense.fish
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TankDiary
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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 ---
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.
- 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
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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
Verdict
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
Both are free to download. TankDiary sells 1 one-off in-app purchase. AquaSense.fish asks for nothing beyond the download.
TankDiary ships an update every 6 days, AquaSense.fish every 5 days. Both last shipped on October 24, 2026.
| Parameter | TankDiary | AquaSense.fish |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.3 (3 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 3 — better |
| Update frequency | Every 6 days | Every 5 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | — | Freemium |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 55 MB | 54 MB |
| Age rating | 4+ | 17+ |
| Developer | kazuki korenori | BRYCE SCOTT SMITH |
In-app purchases
TankDiary
- TankDiary Pro$5.99
AquaSense.fish
No in-app purchases








