TankLog vs Reef Analysis
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
TankLog
This app helps freshwater aquarium hobbyists meticulously track water parameters, CO₂ levels, and care schedules. It provides visual trends for water tests and allows logging of all tank activities, from dosing to livestock. Designed for planted and shrimp tanks, it offers offline functionality and optional one-time upgrades for more tanks or cloud sync.
- Water parameter tracking (pH, ammonia, nitrate, etc.)
- CO₂ estimation and visualization
- Customizable care schedules and reminders
- Activity calendar for logging history
- Optional one-time upgrades for more tanks/cloud sync
- Data export and import functionality
- Siri and Shortcuts integration
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Built by an aquascaper, for aquascapers. Free. Local. Yours. TankLog is a free freshwater aquarium journal for planted tank and shrimp hobbyists. No login required. No subscription. It works fully offline, and everything stays on your device. 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 own target ranges, and Parameter Trends charts every test so you can spot slow pH drifts, creeping nitrates or KH swings before they affect your plants or livestock. CO₂ ESTIMATION TankLog calculates dissolved CO₂ from your pH and KH and shows it as a color-coded zone: very low, low, ideal, high or at risk. Essential for high-tech planted tanks. CARE SCHEDULES & ACTIVITY CALENDAR Schedule water tests, water changes, filter cleans, dosing, feeding and more. Get reminders when tasks are due, see overdue items on your dashboard, and browse your whole care history and upcoming dates in the Activity Calendar. DOSING, WATER CHANGES, FEEDING & CLEANING Log every fertilizer, supplement and treatment with product, amount and date. Log water changes, feedings with species tags, and cleaning tasks, each with its own schedules and history. ACHIEVEMENTS Earn badges for consistent testing, on-time care and great water quality. Tap any badge to see how you earned it. TANK NOTES Jot down anything that isn't a log, like a tap water test or a new plant on the way. Notes show up in your Activity Calendar. SIRI & SHORTCUTS Say "Log a feeding in TankLog" and TankLog opens the right form, ready to fill in. Or put your own shortcut on the Action button. EQUIPMENT, LIVESTOCK & PLANTS Record your lighting, filtration, CO₂ system, heater and pumps. Log fish, invertebrates and plants (with scientific plant names), plus dates and notes. MULTIPLE TANKS Manage up to 3 tanks for free, each with its own parameters, schedules, livestock and history. Need more? Up to 10 Tanks is an optional one-time upgrade, with no subscription. CLOUD SYNC (OPTIONAL) Use TankLog on more than one device, or want a backup? Cloud Sync is an optional one-time upgrade, with no subscription, that keeps your tanks in your own private iCloud. A lost or new phone doesn't mean lost logs, and every iPhone and iPad signed in to your Apple Account stays the same. There's no account to create. TankLog can't see your synced data, and it's never sold, shared or used to market to you. Turn it off, or delete it from iCloud, whenever you choose. YOUR DATA, YOUR WAY Export your complete tank history as a file anytime and import it on any device. No account needed. Your data is yours, always. No AI gimmick. No subscription. Every tracking feature free, forever. Just a well-built, honest tool from someone who loves this hobby as much as you do. Metric and imperial units · 12h and 24h time · Light and dark mode · iPhone and iPad
Reef Analysis
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Reef Analysis — Complete Visibility for Your Reef Aquarium Your reef water data is scattered. ICP results sit in lab portals. Home test readings live in notebooks or spreadsheets. Live sensor data is buried inside each device's own app. Reef Analysis brings all of it into one place — the only app that unifies ICP lab results, home test logs, and live sensor data into a single, configurable dashboard. One tile per parameter. Every source. No more switching. Set your own target ranges for every parameter. Running high nutrients, low nutrients, or a full ULNS? Your dashboard reflects YOUR goals — not generic lab defaults. DASHBOARD One personalised view for every parameter — whether the latest reading came from an ICP test uploaded last week, a home test you logged this morning, or an Alkatronic reading from ten minutes ago. Reorder tiles, hide what you don't need, and switch between standard and gauge views. Multi-tank support with per-tank ranges. ICP TEST RESULTS Upload reports from every major lab — ReefZlements, ATI, Triton, Fauna Marin, Oceamo, Tropic Marin, Aquaforest and Modern Reef. Paste a barcode, drop a PDF, or enter a test ID and AI reads your report automatically. Bulk-upload your entire history in one go. Each element colour-coded against your custom ranges. Tap any parameter for a full trend chart across every test you've ever uploaded. Compare any two tests side-by-side and see exactly what changed. REEF MOONSHINERS ICP TOOLS The complete Reef Moonshiners R11a workflow built in. Load any ATI, Oceamo, Tropic Marin, or Modern Reef ICP result and get instant per-element assessment, daily dose calculations, and trace-element product guidance — no separate spreadsheet, no extra subscription. HOME TEST KITS Log alkalinity, calcium, magnesium, phosphate, nitrate, salinity, pH and more directly in the app. Values show up on your dashboard alongside ICP data so you can track shifts between lab tests. Built-in test-reaction timer with alarm so you never miss the read window. Prefer to automate? Push readings from Home Assistant, n8n, or any script via the REST API. LIVE MONITORING Connect your automated monitoring equipment for real-time readings: • Apex Fusion (Neptune Systems) • Alkatronic (Focustronic) • Mastertronic (Focustronic) • KH Guardian • KH Manager (Carer) • AquaWiz pH, alkalinity, calcium, magnesium, nitrate, phosphate and more — pulled in automatically and merged with your ICP + home test data. REEF LOG — YOUR TANK JOURNAL A timestamped journal for everything you do to your tank: water changes, dosing, equipment swaps, treatments, coral additions, maintenance, observations. Events overlay directly on your dashboard trend charts so you can correlate every parameter shift with what you actually did. HOME-SCREEN WIDGETS iOS and Android widgets show live tank readings on your home screen, lock screen, and (iOS) StandBy — check on your tank without unlocking your phone. WHAT IT DELIBERATELY DOESN'T DO Reef Analysis is a data platform, not a tank controller, livestock tracker, coral marketplace, task scheduler, or AI chat coach. Focused on one thing: complete visibility across every source of your reef water data.
Screenshots
Verdict
The clearest difference is in-app purchases: Reef Analysis at none against TankLog's 2. 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. TankLog sells 2 one-off in-app purchases. Reef Analysis asks for nothing beyond the download.
TankLog ships an update every 6 days, Reef Analysis every 4 days. Both last shipped on October 31, 2026.
| Parameter | TankLog | Reef Analysis |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) — better | — |
| Number of ratings | 3 — better | — |
| Update frequency | Every 6 days | Every 4 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 4 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | John Katez | Ark Technology Ltd |
In-app purchases
TankLog
- Up to 10 Tanks$3.99
- Cloud Sync$3.99
Reef Analysis
No in-app purchases








