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Easily log your pool or spa water chemistry readings. Color-coded results show what needs attention at a glance. Pro version offers import capabilities for test reports or handwritten measurements.
✓Log pool/spa water chemistry
✓Color-coded ideal range indicators
✓Track free chlorine, pH, alkalinity, etc.
✓Import test results (Pro)
✓Save handwritten measurements (Pro)
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What's New in Holy Water
1.1
June 25, 2026
Treatments are here! • Log what you do to your pool — chemicals (acid, chlorine, salt…) and maintenance (backwash, brush, vacuum…), with quick, flexible amounts. • See treatments right alongside your readings in History, and edit or delete any entry. • Edit pools you own — name, volume, surface, and salt. • Clearer free-chlorine guidance, including a new "Shock" indicator so you know when to wait before swimming. • More reliable sign-in and syncing across your devices. • Assorted fixes and polish.
MoreSubscription plans
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Dosing recommendations + AI Powered Imports
$2.991 Month
User reviews
FAQ
What parameters can I log with Holy Water?
Holy Water allows you to log key parameters such as free chlorine, pH, alkalinity, cyanuric acid, and salt. The app provides color-coded feedback against ideal ranges for each parameter.
Does Holy Water have ads?
No, Holy Water does not contain advertisements. The app is free to use with optional in-app purchases for advanced features.
What are the subscription options for Holy Water Pro?
Holy Water Pro offers auto-renewable subscriptions at $2.99 per month or $19.99 per year. These subscriptions unlock features like importing test results from reports or handwritten measurements.
How do I cancel my Holy Water Pro subscription?
You can manage or cancel your Holy Water Pro subscription at any time within your Apple Account settings. Cancellations must be made at least 24 hours before the current subscription period ends.
What devices is Holy Water compatible with?
Holy Water is currently supported on iPhone devices. The app is rated for ages 4 and up.
How often is Holy Water updated?
The latest version of Holy Water is 1.1, which was last updated on June 25, 2026. Updates typically address improvements and new features.
What do users like about Holy Water?
Based on the available rating, Holy Water has received excellent feedback, with a 5.0-star rating from 2 reviews. Users likely appreciate its ease of use and clear visual indicators for water chemistry.
Can Holy Water import my pool store test results?
Yes, the Holy Water Pro subscription allows you to import test results directly from your favorite pool store reports. This feature streamlines the logging process for users.