# TankLog: Aquascape — Fish Tank Log & Reminders > Aquarium journal for tracking water chemistry, maintenance, and livestock privately. (iPhone/iPad app by John Katez.) - Source: https://appshunter.io/ios/app/tanklog-aquascape/id6762062161 (this page in markdown: same URL + `.md`) - Developer: [John Katez](https://appshunter.io/developer/1279354709) - Category: Utilities, Lifestyle - Price: Free - Rating: 5.00/5 from 3 App Store ratings - Age rating: 4+ - Requires: iOS 15.0 · 3 MB - Languages: American English, Dutch, French (France), German (Germany), Italian, Brazilian Portuguese, European Spanish - Released: 2026-04-28 - Data updated: 2026-08-28 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/tanklog-aquascape/id6762062161/reviews.md ## What is TankLog? Built by an aquascaper, for aquascapers. TankLog is a free freshwater aquarium journal for planted tank and shrimp hobbyists. No login. No subscription. Completely offline — your data stays on your device, nothing ever sent to a server. Built for the people who track CO₂ levels, obsess over KH and GH for their neocaridina colony, and want to know when their nitrates started creeping up — not a generic fish app trying to cover everything. WATER TESTING & PARAMETER TRENDS Log pH, ammonia, nitrite, nitrate, KH, GH, phosphate (PO₄), TDS, and temperature. Every reading is graded instantly against your custom target ranges. Parameter Trends charts every test over time, making it easy to spot slow pH drifts, creeping nitrates, or KH swings before they affect your plants or livestock. Each parameter page shows your previous reading alongside recommended ranges. CO₂ ESTIMATION TankLog calculates dissolved CO₂ from your pH and KH readings and displays the result as a color-coded zone — very low, low, ideal, high, or at risk. Essential for high-tech planted tanks where CO₂ directly drives plant growth. CARE SCHEDULES & ACTIVITY CALENDAR Build a maintenance schedule for water tests, water changes, filter cleans, fertilizer dosing, feeding, and more. TankLog sends push notifications when tasks are due and flags overdue items on your home dashboard. The Activity Calendar shows your full care history and upcoming due dates in one view — tap any overdue item to jump straight to the log form. DOSING & FERTILIZER TRACKING Log every fertilizer, mineral supplement, and treatment — with product, amount, and date. Set dosing schedules and track exactly what went into your tank and when. WATER CHANGES, FEEDING & CLEANING Log water changes with volume and percentage. Log feedings with species tags and multiple schedules. Log cleaning tasks — filter maintenance, substrate work, glass cleaning — each with its own schedule and history. ACHIEVEMENTS Earn badges for consistent water testing, on-time care schedules, and overall water quality grades. Tap any badge to see how you earned it, when your streak started, and how to keep it going. EQUIPMENT & LIVESTOCK Record every piece of equipment — lighting, filtration, CO₂ system, heater, pumps. Log fish, invertebrates, and plants with dates added and notes. MULTIPLE TANKS Manage up to 3 tanks, each with its own independent parameters, schedules, livestock records, and history. Switch between them with one tap. YOUR DATA, YOUR WAY Export your complete tank history as JSON anytime. Import it back on the same device or a new one. No cloud dependency. No account to lose access to. Your data is yours, always. No AI gimmick. No subscription. No paywall. Just a well-built, honest tool from someone who loves this hobby as much as you do. Free forever. Metric and imperial units · 12h and 24h time · Light and dark mode · iPhone and iPad ## Key features - Water chemistry tracking - Customizable maintenance schedules - Livestock and plant inventory - Equipment tracker - CO₂ estimation - Privacy-focused, no data collection ## Frequently asked questions about TankLog ### What is TankLog's privacy policy? TankLog is designed with privacy as a core feature. It requires no login, no account, and no subscription. All data is stored locally on your device, with no servers collecting or accessing your information. This means no analytics tracking and no third-party access to your aquarium records. ### Can I track custom water parameters in TankLog? Yes, you can customize which parameters appear when you log a water test. You can toggle optional parameters like Phosphate (PO₄) or TDS on or off, and even disable KH and GH if you don't test them. Ammonia and Nitrite are always tracked. ### How does TankLog help with CO₂ management? TankLog estimates dissolved CO₂ levels based on your pH and KH readings. It displays this estimate in color-coded zones (very low, low, ideal, high, at risk), which is particularly useful for planted tank enthusiasts aiming for optimal CO₂ ranges without stressing fish. ### Does TankLog offer reminders for aquarium maintenance? Yes, you can build a fully customizable maintenance schedule within TankLog. This includes tasks like water changes, filter cleans, fertilizer dosing, and equipment checks. The app will send push notifications when each task is due, and overdue tasks are flagged on the dashboard. ### What devices is TankLog compatible with? TankLog is available for iPhone, iPad, and iPod. It is designed to work across these Apple devices, allowing you to manage your aquarium logs wherever you go. ### How often is TankLog updated? The latest version of TankLog is 1.31, and it was last updated on June 25, 2026. While specific update frequency isn't detailed, this indicates active development and support for the application. ### What is the user rating for TankLog? TankLog has received an excellent rating of 5.0 stars from 3 user ratings. This high score suggests a very positive user experience and satisfaction with the app's features and functionality. ### Can I export my aquarium data from TankLog? Absolutely. TankLog allows you to export your full log at any time in a portable format. This ensures that your aquarium history belongs to you and can be easily transferred or backed up as needed. ## Version history (last 5 releases) ### 1.41 — 2026-08-23 v1.41 — FEELS RIGHT AQUASCAPE PHOTO ZOOM Tap your tank photo and it opens full screen — a clean overlay with your photo filling the display. Tap anywhere to dismiss. Now when you want to really see what's going on in your aquascape, you can. CO₂ GAUGE IS TAPPABLE The needle dot on the CO₂ gauge wasn't doing anything when you tapped it. Now it does — opens the CO₂ parameter page, same as the arrow beside it. If it looks tappable, it should be. ACTIVITY CALENDAR The day panel now uses the actual nav icons next to each logged event — water test, water change, cleaning, dosing, feeding — instead of plain colored dots. The "Today" button also got a calendar icon. Small touches, cleaner read. Free. No login. No subscription. ### 1.40 — 2026-08-15 v1.40 — ACT ON IT ACTIVITY CALENDAR — NOW ACTIONABLE Care schedule due dates now appear on the Activity Calendar. Each due date shows its status — Upcoming, Due Today, or Past Due — and tapping any overdue or due-today item jumps you straight to the log form. Your calendar isn't just a history view anymore: it tells you what needs doing and gets you there in one tap. TEST LOG — BLANK SLATE Water test fields now open blank, so you're always entering real readings — not staring at last session's numbers already filled in. A new Recent section at the top lets you pull in your last test with one tap if you want a starting point. And when a field is empty, a subtle hint shows what you measured last time. Free. No login. No subscription. ### 1.39 — 2026-08-11 v1.39 — YOUR CALENDAR ACTIVITY CALENDAR Tap the date in the header to open the Activity Calendar. Every day you've logged something gets a color-coded dot — purple for tests, blue for changes, tan for cleaning, rose for dosing, gold for feeding. Tap any day to see what was logged. Tap a specific entry and the app jumps straight to it in the history tab — card expanded, scrolled into view. A Next Due banner shows your most pressing upcoming task, and there's a tank picker if you keep more than one aquarium. BADGE ANIMATIONS The five achievement badges that were still static now have icon animations, each matched to what the badge represents: a flame flicker for Resurrected, a rocket rise for Comeback, a radar pulse for Perfect Test, a clipboard tilt for Full Panel, and a gauge rock for Steady Hand. POLISH The Previous Reading section on the CO₂ parameter page now shows the earlier reading in the correct CO₂ zone color — green, yellow, or red — rather than the grade color it was using before. Free. No login. No subscription. ### 1.38 — 2026-08-06 v1.38 — READINGS, ROUNDED OUT CO₂ PREVIOUS READING When you tap the CO₂ Level card, you'll now see a Previous Reading section — the calculated CO₂ ppm from the test before, with a trend arrow and date. Matches the format every other parameter page already had. PARAM TRENDS RECORD COUNT The Param Trends chart on each parameter page now shows a record count in the top right — "4 records" if you have a handful, "last 60" if you've hit the display cap. Quick context for how much data is behind the line. BUG FIX The trend arrow on the Previous Reading section was showing the wrong direction — it was repeating the current test's arrow instead of computing the trend for that earlier reading. Fixed. Free. No login. No subscription. ### 1.37 — 2026-07-29 v1.37 — KNOW THE TREND PREVIOUS READING Tap any water test tile — pH, Ammonia, Nitrite, whatever you track — and you'll now see two readings instead of one. The top label is now LATEST READING. Below it, a new PREVIOUS READING section shows the value from the test before, a trend arrow (↑ ↓ →), the grade in its color, and the date of that earlier test. At a glance: is your water chemistry improving, holding steady, or heading the wrong way? BEST STREAK DATES On the Clean Streak and On-Time Streak achievement pages, if your current streak isn't your personal best, you'll now see the record: a trophy icon, "Best: 6x", and the exact date range it ran — "Jun 22 – Jul 27". If the best was from a previous year, the year is shown. Something to aim for. POLISH The shimmer on achievement badge pills now sweeps through using the badge's own color at low opacity, instead of the grey/white wash that was making the text hard to read while animating. BUG FIXES The first data point on Param Trends was clipping behind the y-axis. Fixed. The On-Time Streak badge now clears immediately when your test window turns overdue, rather than waiting until the next log. Free. No login. No subscription. ## More apps by John Katez - [Jezebel the Frenchie Stickers](https://appshunter.io/ios/app/jezebel-the-frenchie-stickers/id1279354710) - [Mackro](https://appshunter.io/ios/app/mackro/id6771991453) All apps by John Katez: https://appshunter.io/developer/1279354709 --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-28.*