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Pool Log

Michael Holloway

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About this app

TEST AT HOME. KNOW EXACTLY WHAT TO ADD. Enter your test results and Pool Log tells you which chemical to add, how much, and what it will do to your water. Doses account for your pool's volume, its current chemistry, and the strength of the product on your shelf. POOLS AND HOT TUBS Track a backyard pool, a hot tub, or both. Each gets its own targets for its sanitizer (liquid chlorine, salt, tablets or bromine) and its surface (concrete, vinyl or fibreglass). CHEMISTRY YOU CAN TRUST Recommendations follow established industry standards for pool and spa water. Pool Log calculates the Calcite Saturation Index (CSI), so you can see whether your water will etch plaster or scale tile. SLAM mode raises your chlorine target to clear algae, based on your CYA, then steps back down. SEE WHAT CHANGED Charts for every level; a history of tests, chemicals, maintenance and costs; and the local weather recorded with each entry. All you enter is a postal code, with no location permission needed. PRIVATE BY DEFAULT No account. Your data stays on your device unless you turn on iCloud sync between your own Apple devices. Tracks free, combined and total chlorine, bromine, pH, alkalinity, calcium, CYA, salt, borates, TDS and temperature, in US, UK or metric units. Premium (monthly or yearly): multiple pools, CSV export, iCloud sync and priority support. Privacy Policy: https://benholloway.org/pool-log/privacy/ Terms of Use: https://benholloway.org/pool-log/terms/

What's new

Version 1.3 · Nov 12, 2026

New: • Hot tubs. Set up a hot tub, or switch an existing pool to one, for spa targets, reminders and a drain-and-refill schedule. Bromine setups skip the CYA reminder. • Pool Log is now available in Italian and Dutch. • Adding a chemical previews what it will do to each level you track. • Liquid chlorine includes household bleach strengths: 6%, 7.5% and 8.25%. More accurate doses: • Corrected the strengths behind sulfuric acid, dry acid, soda ash, borax, chlorine tablets and other chemicals, checked against the Taylor tables. Some doses were off by a third or more. • Raising pH with soda ash or borax now accounts for your water's alkalinity, CYA and borates, the same way lowering pH does. • Doses are rounded to amounts you can measure ("281 ml", not "280.85 ml"), and logging a recommended dose starts from that amount. • Borates have a target range (30–50 ppm). Before, a tracked borate level always looked fine, and the app suggested draining the pool to lower it. Units: • UK doses show UK fluid ounces and gallons. Some showed US fluid ounces. • Amounts move to the larger unit when they round to it: "1 kg", not "1000 g". • Editing an entry logged in other units converts the amount instead of relabeling it. Fixes and polish: • Forms reject readings that can't be right, such as a pH above 14. • A level screen left open updates when you log a new test. • A recommended dose can be saved right away. Save stayed disabled until you changed something. • History shows each chemical's icon, its strength and an easy-to-measure amount. • Weekly and monthly reminders show their days again ("Weekly on Monday", not "Weekly"). • With Pool Log set to a language other than your region's, numbers, text fields and the keyboard use the same decimal separator. • The chart's time range is translated. • Better Spanish and French wording. Removed: • Siri and Shortcuts actions. Home Screen quick actions still work. Thanks for using Pool Log.

In-app purchases

The most popular purchases on the App Store.

  • Annual PlanSubscription · 7 days free trialUSD 8.99 / year
  • Monthly PlanSubscription · 7 days free trialUSD 0.99 / month

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