Pool Log vs Pool Chemistry
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Pool Log
This app provides precise chemical dosing instructions for pools and spas based on your test results. It tracks multiple water bodies, integrates local weather data, and offers advanced features like SLAM mode for algae and CSI calculations. All data is stored locally for privacy.
- Precise chemical dosing instructions
- Manages multiple pools and spas
- Weather-aware test result tracking
- SLAM mode for algae treatment
- Calcite Saturation Index (CSI) calculation
- Chemical addition logging
- Maintenance task tracking
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SKIP THE POOL STORE Stop driving to the pool store for tests that are inconsistent, expensive, and end with someone trying to upsell you chemicals you don't need. PoolLog turns your own test results into precise dosing instructions in seconds — using the same Taylor Technologies and Pool & Hot Tub Alliance formulas the pros rely on. POOLS AND SPAS, ONE APP Manage every body of water from one place. PoolLog handles backyard pools, spas, hot tubs, and rentals — each with its own sanitizer system, surface type, target ranges, and history. Switch between them with a tap. WEATHER-AWARE TRACKING Test results pair with the local weather automatically (no location permission required, just a postal code). Spot the patterns that matter: heatwave chlorine drops, post-rain alkalinity swings, the bather load that always nudges your pH. YOUR DATA. YOUR DEVICE. No account required. Nothing leaves your phone unless you turn on optional iCloud sync — and even then it's only ever between your own Apple devices. Other apps want a login and a cloud account before they'll show you a number. We don't. PREVIEW THE EXACT DOSE Before you add anything, PoolLog shows the precise amount of each chemical you'd need to reach your target — accounting for your pool's volume, current chemistry, and the specific concentration of the product on your shelf. Add the chemical, log the addition, done. GROUNDED IN REAL CHEMISTRY Recommendations come from peer-reviewed industry standards — Taylor Technologies, the Pool & Hot Tub Alliance, and the same CSI formula commercial operators use to keep plaster pools from etching or scaling. We document every formula in the app's references. SLAM MODE FOR ALGAE When the green hits, switch on SLAM (Shock, Level, And Maintain) and PoolLog raises the chlorine target to the appropriate level for your CYA, walks you through the procedure, and resets when you're back to normal. Built for the TFP-style algae recovery the rest of the industry won't talk about. CSI CALCULATION INCLUDED The Calcite Saturation Index tells you whether your water is going to scale (build up calcium deposits) or etch (eat your plaster). PoolLog calculates it from your pH, temperature, calcium hardness, alkalinity, and TDS — and shows it on the dashboard, not buried in a settings screen. EVERYTHING THAT'S IN HERE • Free chlorine, combined chlorine, total chlorine • Bromine sanitizer support (chlorine alternative for spas) • pH, total alkalinity, calcium hardness, cyanuric acid • Salt level with custom ranges per cell manufacturer (Hayward, Pentair, Jandy) • Borates, TDS, water temperature • CSI dashboard tile and history • Chemical addition logging with concentration-aware dosing • Maintenance task tracking — brushing, backwashing, filter cleans, opening/closing • Expense tracking with categories • Beautiful charts for every level • Test reminders that pause when the pool is closed for the season • Imperial / UK imperial / metric units • English, Spanish, and French PREMIUM FEATURES Upgrade to Premium with a monthly or yearly subscription: • Multiple pools (free version supports one) • Data export to CSV for spreadsheets and analysis • iCloud sync across your Apple devices • Test strip scanner (coming soon) • Priority support WHO THIS IS FOR Pool and spa owners who'd rather spend their weekend swimming than queueing at the pool store. New owners who want a smart guide. Experienced owners who already know their CYA from their CSI and want a logger that respects that. Privacy Policy: https://blite.github.io/PoolLog/privacy/ Terms of Service: https://blite.github.io/PoolLog/terms/
Pool Chemistry
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Chlor is the precision pool chemistry companion built for serious pool owners. Stop guessing - test smarter, dose accurately, and swim in perfectly balanced water every time. WHETHER YOU OWN A POOL, SPA, OR HOT TUB Chlor tracks every body of water you manage. Log test results, calculate exact chemical doses, and follow a smart maintenance schedule - all in one beautifully designed app. ACCURATE CHEMICAL CALCULATORS - Free Chlorine - calculate exact liquid chlorine, Cal-Hypo, Dichlor, or Trichlor dose - pH - calculate muriatic acid or soda ash to hit your target - Total Alkalinity - sodium bicarbonate dosing with precise measurements - CYA (Cyanuric Acid) - stabilizer additions with partial drain guidance - Calcium Hardness - raise calcium with calcium chloride calculations - Langelier Saturation Index (LSI) - prevent corrosion and scaling - SLAM Calculator - shock treatment with CYA-adjusted FC targets - Salt Level - sodium chloride additions for saltwater pools - Volume Estimator - calculate gallons from pool dimensions SMART TEST LOGGING - Log your water test results with a clean, fast interface - Color-coded status indicators show exactly which parameters are in or out of range - Full test history with timestamps and test kit identification - Filter tests by pool or hot tub CHEMISTRY TRENDS (Pro) Track how your pH, free chlorine, and total alkalinity change over time. Visualize trends with interactive charts, spot seasonal patterns, and catch drift before it becomes a problem. CHEMICAL TREATMENT LOG Record every product you add to your pool - liquid chlorine, muriatic acid, sodium bicarb, algaecide, and more. Each treatment is linked to your water body and timestamped so you always know what went in and when. CYA-ADJUSTED FREE CHLORINE TARGETS Chlor uses the scientifically correct FC:CYA ratio to calculate your ideal free chlorine range - not the oversimplified 1-3 ppm most apps use. Your pool is as unique as your CYA level. MAINTENANCE SCHEDULE - Create recurring tasks (skimming, filter cleaning, equipment checks) with custom frequencies - Tasks are automatically sorted by urgency: overdue, due this week, and upcoming - Mark tasks complete and view your full maintenance history AI POOL ASSISTANT (Pro) Ask any pool chemistry question and get personalized advice based on your water body and recent test results. Troubleshooting cloudy water, planning a SLAM, or figuring out the right stabilizer dose - the AI assistant gives you an instant expert answer. MULTIPLE POOLS AND SPAS Manage your backyard pool, the hot tub, and the spa all in one app. Each body of water gets its own test history, calculator context, and maintenance schedule. DESIGNED FOR ACCURACY Chlor's calculation engine is based on the industry-standard chemistry formulas used by professional pool technicians. Every dose calculation accounts for your pool volume, current levels, target levels, and chemical concentration. CHLOR PRO Upgrade to unlock all 9 calculators, unlimited test history, chemistry trends charts, full maintenance history, AI Pool Assistant, and unlimited pools and spas. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is device support: Pool Log at 3 against Pool Chemistry's 1. Pool Chemistry's advantage is iOS requirement (18 vs 26.0). On price, update cadence, ads and in-app purchases 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. Pool Log sells 2 in-app purchases, starting at $0.99 per month and Pool Chemistry sells 3 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.
Pool Log ships an update every 4 weeks, Pool Chemistry every 6 weeks. The most recent releases landed on October 24, 2026 and October 20, 2026 respectively.
| Parameter | Pool Log | Pool Chemistry |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (8 ratings) — better | — |
| Number of ratings | 8 — better | — |
| Update frequency | Every 4 weeks — better | Every 6 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, Mac — better | iPhone |
| Requires iOS | 26.0 | 18 — better |
| Further details — not scored | ||
| Size | 14 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | Michael Holloway | Karol Jaworski |
In-app purchases
Pool Log
- Monthly Plan7 Days trial$0.991 Month
- Annual Plan7 Days trial$7.991 Year
Pool Chemistry
- Chlor Pro Monthly$4.991 Month
- Chlor Pro Yearly$39.991 Year
- Chlor Pro Yearly Promo1 Year trial$39.991 Year









