Comparison

LSI Pool and Spa Calculator vs Pool Soft Admin

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

LSI Pool and Spa Calculator

Easily calculate and track the Langelier Saturation Index for your pool water. Maintain optimal water balance for a healthy and safe swimming environment. Supports multiple units and saves your calculations over time.

Highlights
  • LSI Calculation
  • Water Chemistry Tracking
  • Email Calculations
  • CSV Export
  • Offline Use
  • Universal App Support
Features
Read full description

You take pride in caring for pools and spas, and your attention to each reading matters. Thank you for using LSI Pool and Spa Calculator to keep water balance checks, customer details, and service records together. Maintain a pool route, look after a commercial property, or care for your own spa with a water chemistry app that calculates the Langelier Saturation Index and keeps your visit history. Check a result, save the visit, and review the details before your next test. CHECK WATER BALANCE - Calculate LSI using pH, water temperature, calcium hardness, total alkalinity, and total dissolved solids. - See LSI, predicted saturation pH, and a result category. - Review whether your readings indicate a tendency toward scale or corrosion. - Enter temperature in Fahrenheit or Celsius. - Switch units with automatic temperature conversion. - Use the built-in guide to understand the calculation and its inputs. KEEP A SERVICE HISTORY - Save readings under reusable pool, spa, or property names. - Add visit dates and notes about treatments, observations, or follow-up work. - Search records by site, date, notes, or result category. - Sort history to find recent visits or review earlier readings. - Edit saved measurements and recalculate after a correction. - Duplicate a previous record for repeat visits. - Review the selected reading beside your records list on iPad. ORGANIZE CUSTOMERS AND PROPERTIES - Store customer names, companies, phone numbers, email addresses, and notes. - Add contacts manually or choose people to import from device Contacts. - Link several properties to one customer. - Keep a separate address and notes for each site. - Search customer details when you need a phone number or service context. - Edit local customer copies without changing device Contacts. - Keep sites and readings when you remove a customer. FIND SITES ON THE MAP - Open Site Map from Stats to see properties with resolved addresses. - Use the site's address or its linked customer's address. - Tap a pin to open customer details and linked sites. - Find all saved sites in the searchable list, including those awaiting an address. - Add or correct an address and retry its lookup. REVIEW YOUR WATER CHEMISTRY - Compare minimum, maximum, and average readings by site. - View charts for LSI, pH, temperature, calcium hardness, alkalinity, and TDS. - Filter saved readings by result category. - Open a complete reading from Stats when you need the details. - Use sortable spreadsheet review to compare service history. MAKE QUICK CHECKS BETWEEN VISITS - Use Quick Calc without adding a reading to site history. - Keep recent calculator inputs and the latest result on this device. - Reuse values when testing similar water. - Reset the calculator for a fresh check. REPORTS AND BACKUPS - Share a calculation as text or a PDF report. - Export readings, sites, or contacts as CSV files for spreadsheets. - Create PDF reports for your chosen information. - Save a readings backup or a complete backup with customers and site links. - Import a JSON backup while skipping exact duplicates. - Share files through the iPhone and iPad share sheet. Choose Light, Dark, or system appearance and set your preferred temperature units. Habits & Progress lets you set testing goals and review milestones inside the app. Start with up to five saved records in the free version. LSI Pro unlocks a larger record allowance, spreadsheet review, backup import, individual report sharing, and printing. Monthly and lifetime purchase options are available. Use LSI alongside reliable water tests and equipment guidance. Keep measurements, property details, and notes ready for your next service day. Monthly Pro is a 1-month auto-renewable subscription. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Pool Soft Admin

Features
Read full description

Pool Soft Admin is application serving multiple pool service companies. Our mission in Pool Soft is to deliver the best pool service to our clients and to level up the pool service standards. If you are a manager or administrator of a pool company served by Pool Soft Admin or want to find a pool company around you, then we can help. With this mobile app, administrators will be able to manage entire system. Follow who is working. Manage clients and employees. Manage client's pools. Plan visitations upfront. Create schedule for a technician(Most of the task is done by the system as will preselect for you planed pools for the day). View scheduled pools or those to be scheduled on a map or list. View a pool's details and history of reports. Multiple export. Change company data and colors that will customize all apps that are related to your company. Track working time. Review payrolls and so on. The application is in continues development and many more features are planned and will be available in next recent versions.

Screenshots

LSI Pool and Spa Calculator3 screens
Pool Soft Admin4 screens

Verdict

The call

The clearest difference is in-app purchases: Pool Soft Admin at none against LSI Pool and Spa Calculator's 2. Pool Soft Admin also leads on iOS requirement (15.6 vs 17.6). On price, update cadence, ads and device support 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. LSI Pool and Spa Calculator sells 2 in-app purchases, starting at $1.99 per month. Pool Soft Admin asks for nothing beyond the download.

UpkeepUpdate frequency

LSI Pool and Spa Calculator ships an update every 6 weeks, Pool Soft Admin monthly. The most recent releases landed on October 23, 2026 and October 16, 2026 respectively.

Scorecard2 real differences · 8 level
LSI Pool and Spa Calculator versus Pool Soft Admin: the parameters behind the verdict, then further details
ParameterLSI Pool and Spa CalculatorPool Soft Admin
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews75.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 6 weeksMonthly — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaid—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.615.6 — better
Further details — not scored
Size7 MB46 MB
Age rating4+4+
DeveloperVerosocial StudioSUBCOMM MANAGEMENT OOD

In-app purchases

2 purchases

LSI Pool and Spa Calculator

Subscriptions1
  • LSI Calculators pro Monthly$1.991 Month
One-time1
  • LSI Calculators pro lifetime$14.99
None

Pool Soft Admin

No in-app purchases

Questions

Is LSI Pool and Spa Calculator free?
LSI Pool and Spa Calculator is free to download, with in-app purchases available.
Is Pool Soft Admin free?
Pool Soft Admin is free to download, with no in-app purchases.
Do LSI Pool and Spa Calculator or Pool Soft Admin have ads?
Neither LSI Pool and Spa Calculator nor Pool Soft Admin shows ads.
Which is updated more often, LSI Pool and Spa Calculator or Pool Soft Admin?
LSI Pool and Spa Calculator ships an update every 6 weeks, and Pool Soft Admin monthly. Most recently, LSI Pool and Spa Calculator was updated on October 23, 2026 and Pool Soft Admin on October 16, 2026.

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