TankLog vs ReefDrift

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

Log every reef parameter in seconds. ReefDrift calculates a Tank Stability Score — Stable, Watch, or Danger — the instant you save a reading. Catch a 0.3 dKH swing before it costs $500 in coral. No account. No cloud. Just your tank data, on your device. LOG THE BIG THREE AND EVERYTHING ELSE Alkalinity (dKH), Calcium, Magnesium — the parameters reef keepers obsess over. Plus Nitrate, Phosphate, pH, Salinity, Temperature, Ammonia, and Nitrite. Last values pre-fill automatically so a full test set takes under ten seconds, not one screen per parameter. TANK STABILITY SCORE ReefDrift calculates a Stable, Watch, or Danger score the instant you save a reading. The score weights every parameter against your target band and flags drift between sessions. A single alk swing from 8.4 to 7.1 dKH registers as Danger before you wonder why a frag is pale. Out-of-range chips light up on the dashboard immediately — no digging, no scrolling. DOSING CALCULATOR — WIRED TO YOUR TANK BRS 2-part, ESV B-Ionic, Red Sea Foundation, Aquaforest KH Coralline, and custom products. Enter tank volume and current reading; ReefDrift gives you the exact dose to hit your target. Works for alk, cal, mag, NO3, and PO4. The math uses your real tank volume, not a generic estimate. TREND CHARTS WITH TARGET-RANGE BANDS Every reading plotted on a line chart with your target band overlaid. See whether alkalinity is riding the top of the band, drifting toward the floor, or cycling after a large dose. Adjust the time window from 7 days to 12 months. MAINTENANCE LOG Record water changes, GFO swaps, ATO top-offs, carbon additions, and frag-tank moves. Cross-reference maintenance events against parameter charts to see what actually moved the needle. TEST REMINDERS Set a reminder per parameter or per task. ReefDrift sends a local notification on schedule — no server required. Never miss a Friday alk test again. HOME SCREEN WIDGET Your last three parameters and next task on your iPhone home screen or lock screen. See your tank status without opening the app. BUILT BY REEF HOBBYISTS We run SPS-dominant systems. We have watched a two-week alk drift destroy a $2,000 Acropora collection. We built ReefDrift because every existing option was either abandoned, clunky, cloud-first, or a bloated social network with a parameter logger bolted on. ReefDrift is ruthlessly focused: fast log, honest score, useful calculator. Nothing else. PRIVACY — YOUR DATA STAYS ON YOUR DEVICE No account. No cloud. No login. All readings are stored locally on your iPhone and never leave your device unless you export them as CSV. Nothing to hack, nothing to lose in a server outage. ReefDrift Pro: Monthly $3.99 · Yearly $19.99 (save 58%) · Lifetime $59.99 — unlimited tanks, no ads, home screen widget, advanced charts, dosing correlation, and PDF reports. Supports: dKH, meq/L, ppm · SG, ppt · °C, °F Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://lid-web-privacy.web.app/reefdrift-privacy-policy-ios.html