Comparison

NPC Pro vs Leak Logic

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

Head to head
About

NPC Pro

This app helps pool professionals manage water chemistry and follow startup procedures for plaster finishes. It offers an LSI calculator, water chemistry recommendations, and step-by-step guides for maintaining pool surfaces. Connect with experts and access resources to ensure balanced water and durable finishes.

Highlights
  • LSI Calculator for water balance
  • Water chemistry recommendations
  • Plaster startup procedures guide
  • Easy data input for instant results
  • Professional-grade accuracy
  • Ask the Expert feature
  • Access to podcasts and technical resources
Features
Read full description

NPC Pro LSI Calculator & Startup Guide – The Ultimate Water Chemistry Tool for Pool Professionals! Developed by the National Plasterers Council (NPC), the NPC Pro LSI Calculator & Startup Guide is the essential app for pool professionals, technicians, and service providers. Whether you’re calculating the Langelier Saturation Index (LSI) to ensure balanced water chemistry or following proper startup procedures for new plaster finishes, this app simplifies the process with accuracy and ease. Key Features: - LSI Calculator – Quickly determine water balance to prevent scaling, etching, and plaster degradation. - Water Chemistry Guide – Get precise recommendations for pH, alkalinity, calcium hardness, and more. - Startup Procedures – Follow NPC’s step-by-step plaster startup guide for long-lasting, durable finishes. - Easy Data Input – Enter key pool chemistry values and get instant LSI results. - Professional-Grade Accuracy – Designed for pool contractors, service techs, and water chemistry experts. - User-Friendly Interface – Simplifies complex calculations for effortless use on the job. - Ask The Expert – If you have questions we have answers, use our ask the expert form to get answers to your toughest questions from the NPC community experts. - Connect. Engage. Explore. In addition to the tools, NPC Pro offers you access to find members, stream podcasts, access technical resources, connect with NPC social media and more. - Podcasts Why Use the NPC Pro LSI Calculator & Guide? Balanced water chemistry is crucial to maintaining a beautiful, durable swimming pool finish. The LSI Calculator ensures your water is within the ideal range, preventing costly repairs and extending the life of pool surfaces. The Startup Guide provides step-by-step instructions to correctly introduce new plaster finishes, avoiding common issues like discoloration or surface roughness. Whether you’re a pool professional, service technician, or pool owner looking for precise water chemistry management, this app is your go-to tool! Download the NPC Pro LSI Calculator & Startup Guide today and take the guesswork out of pool chemistry! Pool Owners • Pool Professionals • Tech Resources • Education Affiliations: American Shotcrete Association Independent Pool and Service Association California Pool and Spa Association The Association for Pool and Spa Professionals American Concrete Institute American National Standards Institute Institute for Code Council Our Mission The National Plasterers Council will continue to be the utmost authority in the preparation, application, materials, start-ups and preservation of cementitious pool interior finishes. The NPC will collaborate with other associations and serve the industry through research, education, promotion, and certification of all segments of the pool industry including pool owners, the pool service providers, plasterers, manufacturers, specifiers, remodelers, architects, and builders.

About

Leak Logic

This app streamlines swimming pool leak detection by guiding technicians through a comprehensive inspection process. It facilitates efficient data collection, photo documentation, and generates professional PDF reports for customers. A web portal manages job flow and provides searchable records for businesses.

Highlights
  • Guided leak detection inspection procedure
  • Photo and data collection for job sites
  • Dynamic fields and multiple-choice questions
  • Component inspection with problem annotation
  • Automated PDF job report generation
  • Web-based job management portal
  • Customer and job history tracking
Features
Read full description

Leak Logic is a swimming pool leak job data collection and reporting app that helps users complete a leak detection job efficiently and effectively. The end result is a comprehensive PDF report of the work done for your customer. Additionally, the app includes a web-based management portal that facilitates backend job flow and generates a sortable record of all leak jobs performed by your company’s users. The mobile data collection portion of the app encourages the leak technician user to follow a best practices procedure at the job site. The app’s Menu Page monitors and displays your progress through a comprehensive inspection of the pool. A dynamic display of fields based on previous entries and multiple-choice questions minimizes data entry. - The first section communicates Job Info that is usually recorded before getting to the job site. - An Initial Observations section collects photos, equipment observations, and optional Leakalyzer* results that provide a basis for work at the pool. - The core Component Inspection sections identify each part of the pool (skimmers, return fittings, lights, etc.) that must either be inspected – with a method identified or excluded – with a reason for exclusion recorded. If a problem is identified annotated photos and text sections provide an opportunity for describing the problem found as well as the type of patch or remedy applied. - At the job’s Conclusion, the user records final observations, a diagram of the problems found and a final Leakalyzer* test to confirm problem resolution. All collected data is recorded in a web-based management portal where each job’s results can be reviewed before automatically generating an attractive, easy to read, and logically organized PDF Job Report that is custom branded with your company logo. The report is a concise record of the leak job that provides a valuable and tangible record of the work done. The web-based Leak Logic management portal provides a means of managing leak jobs as they progress from leads to scheduled work, to complete and invoiced transactions. Completed job records can be easily sorted, searched and analyzed. The portal also enables you to keep a list of repeat customers (like pool companies, or property managers) facilitating data entry and analysis of jobs for this customer type. Optional invoicing add-ons and additional integrations to common business process software are in the works. Whether you are an independent sole proprietor, the leak specialist at your pool company, or a multi-truck leak company, the Leak Logic App will help to increase your professionalism and add value to your leak detection services. *Leakalyzer data is entered into the Leak Logic App via graphics file created using Anderson’s Leakalyzer Reporting App which is included with a purchase of the Bluetooth enabled Leakalyzer.

Screenshots

NPC Pro4 screens
Leak Logic4 screens

Verdict

The call

The clearest difference is update cadence: Leak Logic at every 5 weeks against NPC Pro's every 24 months. On price, ads, in-app purchases and monetization model 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

NPC Pro ships an update every 24 months, Leak Logic every 5 weeks. The most recent releases landed on September 8, 2026 and June 1, 2026 respectively.

Scorecard1 real difference · 9 level
NPC Pro versus Leak Logic: the parameters behind the verdict, then further details
ParameterNPC ProLeak Logic
PriceFreeFree
Rating—5.0 (3 ratings) — better
Positive reviews60.0% of reviews—
Number of ratings—3 — better
Update frequencyEvery 24 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better16.1
Further details — not scored
Size84 MB38 MB
Age rating4+4+
DeveloperNational Plasters Council, IncAnderson Manufacturing Company, Inc

Customer experience

NPC Pro

Written reviews10 reviews
Positive60.0%
Neutral10.0%
Negative30.0%

Leak Logic

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

NPC Pro

No in-app purchases

None

Leak Logic

No in-app purchases

Questions

Is NPC Pro free?
NPC Pro is free to download, with no in-app purchases.
Is Leak Logic free?
Leak Logic is free to download, with no in-app purchases.
Do NPC Pro or Leak Logic have ads?
Neither NPC Pro nor Leak Logic shows ads.
Which is updated more often, NPC Pro or Leak Logic?
NPC Pro ships an update every 24 months, and Leak Logic every 5 weeks. Most recently, NPC Pro was updated on September 8, 2026 and Leak Logic on June 1, 2026.

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