LSI Pool and Spa Calculator

LSI Pool and Spa Calculator

Water Balance & Service Log

1 ratings
14 reviews
Free
In-App Purchases

Price history


Details

Released
May 27, 2010
Updated
November 3, 2026

Features

LSI Pool and Spa Calculator screenshot #1 for iPhone
LSI Pool and Spa Calculator screenshot #2 for iPhone
LSI Pool and Spa Calculator screenshot #3 for iPhone
LSI Pool and Spa Calculator screenshot #4 for iPhone
LSI Pool and Spa Calculator screenshot #5 for iPhone
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About

This app helps pool and spa professionals organize water testing readings, customer details, and service visits. It calculates the Langelier Saturation Index, tracks historical data, and generates service reports for clients.

✓Calculate LSI from water parameters
✓Track customer and site details
✓Log service visits and chemical actions
✓View historical data and charts
✓Generate service reports
✓Schedule future visits
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What's New in LSI Pool and Spa Calculator

9.8

November 3, 2026

Your careful pool and spa checks deserve tools that respect your time. Thank you for using LSI Pool and Spa Calculator and keeping useful records. This update gives you more control over form inputs, sharing, and the guidance you see while you work. RESET FROM THE INPUT MENU - Find Reset in the three-line menu on input and search screens. - Start a new form again or return to its usual defaults. - Return an edited saved item to its saved values before making another change. - Clear a search without deleting the records you were browsing. - Restore default sorting and result filters in filter menus. - Keep saved readings, customers, sites, and visits when you reset current inputs. SHARE THE VALUES IN FRONT OF YOU - Share field labels and entered values from the same menu. - Send an unfinished form without completing every field first. - Keep names, units, dates, and notes alongside their values. - See empty fields marked as Not entered rather than guessing what is missing. - Share a search or filter setup when you need to explain what you are reviewing. - Share inputs without saving a record or starting an import. PRACTICE INPUTS ARE YOUR CHOICE - Sample Data and Randomize now have separate switches in Settings. - Both options start off, leaving your regular input menu focused on Reset and Share. - Enable Sample Data when you want a repeatable example to explore. - Enable Randomize when you want a variation to work through. - Generated field text no longer includes the Sample: prefix. - Calculate, Save, Import, and completing a visit remain separate choices. MORE ROOM FOR THE TASK AT HAND - Longer form instructions now live in Details and Help. - Open guidance in its own sheet on iPhone and iPad. - Tap the information button to open Details whenever you need help. - Find instructions for linked customers, addresses, reading selection, and follow-up dates. - Keep your own multiline notes editable in their original fields. - Leave operational messages and important export-limit notices within reach. CLEARER SERVICE VISIT ENTRY - Use shorter labels for Chemical Actions, Service Notes, and Customer Notes. - Open Details for examples of what belongs in each field. - Share the visit's current labels and values, including its completed-work choices. - Reset an edited visit to its original values and linked reading without saving changes. - Clear an unsaved new-visit draft when you want to start again. - Keep linked water readings as independent records, even if a visit is discarded. THE SAME CONTROLS IN MORE PLACES - Reset and Share are available in site and customer editors and their search screens. - Use them in Quick Calc, saved-reading entry, and record details. - Share record searches and statistics filters with their labels. - Reset export choices without exporting, importing, or clearing your database. - Share your weekly testing goal from Habits & Progress. - Restore appearance and input-action preferences from Settings. APPLE WATCH INPUT OPTIONS - Open the calculator or number-entry menu for Reset and Share. - Share labeled inputs even before a calculation is ready. - Expand Details for help while keeping the main screen focused. - Turn on Sample Data and Randomize separately in Watch Settings. - Keep Watch settings independent from your iPhone choices. - Continue calculating, saving, and sharing readings locally on your watch for free. Your existing records and notes stay yours. Free input sharing sends the values you enter. Individual calculated iPhone reports and PDF reports still require LSI Pro; Watch reports remain free. Choose the tools you need, review each reading, and keep building a useful service history.

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Subscriptions & In-App Purchases

LSI Calculators pro Monthly

Unlimited app usage with all features for 1 month

$1.991 Month
How to cancel LSI Pool and Spa Calculator subscription ⁉️

User reviews

Works very well for calculating LSI

It has a record storage feature so I can save sites and look them up when necessary

Great Calculator with really good record use

It’s good to have the records on the device so that you can pull them up, especially with the other features and the unlimited watch Calculator is nice as well

Really great app that keeps setting feature features

The new contacts feature is incredible because I can finally organize the pools and spas and what not

Works great for tracking

The graphing and charting is particularly useful and a great addition to

One off fee payment removed

Paid the one off fee to use the app, accessed a few week, but has now stopped working and ‘restoring’ the purchase does not work either. So can no longer use.

Developer apps

FAQ

What is the LSI Pool and Spa Calculator?

LSI Pool and Spa Calculator is a utility app designed for pool and spa professionals. It helps organize water testing readings, customer details, and service visits, while also calculating the Langelier Saturation Index.

How does LSI Pool and Spa Calculator calculate LSI?

It calculates the LSI by taking measured values for pH, water temperature, calcium hardness, total alkalinity, and total dissolved solids. The app then provides a saturation pH and a result category indicating scale or corrosion tendency.

Can I track customer and site information with LSI Pool and Spa Calculator?

Yes, you can save customer names, companies, phone numbers, emails, addresses, and notes. You can also link multiple sites to a single customer and manage each site's address independently.

Does LSI Pool and Spa Calculator offer a subscription for advanced features?

Yes, there is a 'LSI Calculators pro Monthly' subscription available for $1.99 per month, which likely unlocks additional features or removes limitations.

What devices is LSI Pool and Spa Calculator available on?

LSI Pool and Spa Calculator is available on both iPhone and iPad devices, making it versatile for on-the-go use.

How often is LSI Pool and Spa Calculator updated?

The app was last updated on November 3, 2026, with version 9.8. This indicates a relatively recent update, suggesting ongoing development and support.

What is the age rating for LSI Pool and Spa Calculator?

LSI Pool and Spa Calculator has an age rating of 4+, meaning it is suitable for users of all ages and does not contain mature content.

Does LSI Pool and Spa Calculator have ads?

No, LSI Pool and Spa Calculator does not contain advertisements. This provides an uninterrupted user experience for managing pool and spa services.