Pool Log
Pool & Spa Chemistry, Solved
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Pool season is here. Skip the pool store, test at home, and PoolLog tells you exactly what to add — pools, spas, and hot tubs all in one app.
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 for $0.99/month or $7.99/year:
• 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/
Ratings & Reviews
This update is a chemistry fix: the pH-lowering acid dose was under-shooting. The new calculation properly accounts for total alkalinity, cyanuric acid, borates, and water temperature, so the suggested dose is now close to what you actually need to add.
Bug fixes:
• Dose recommendation now appears as soon as you open a level. Previously, if you'd never picked a chemical for that level before, the picker would show one but no dose was computed until you switched chemicals and back.
• Buttons on the level detail, recommendation, and onboarding screens are now readable in dark mode. Several were white text on neon green.
New warnings:
• A warning when your pH reading is at or above 8.0. That's the top of most test scales, so re-test pH after lowering it.
• A warning when dry acid is selected on a salt-water-generator pool. Dry acid adds sulfates that can damage the SWG cell. Muriatic acid is the safer choice.
Thanks for using PoolLog.
The developer, Michael Holloway, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Michael Holloway
- Size
- 11.7 MB
- Category
- Utilities
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - iPad
Requires iPadOS 26.0 or later. - Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.0 or later.
- iPhone
- Languages
English and 2 more
- English, French, Spanish
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Monthly Plan $0.99
- Annual Plan $7.99
- Copyright
- © 2026 Michael Holloway
