# NPC Pro vs Pool/Spa/Patio/Deck Expo

The clearest difference is update cadence: Pool/Spa/Patio/Deck Expo at monthly against NPC Pro's every 24 months. NPC Pro's advantage is iOS requirement (15.0 vs 17.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

NPC Pro ships an update every 24 months, Pool/Spa/Patio/Deck Expo monthly. The most recent releases landed on October 24, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | NPC Pro | Pool/Spa/Patio/Deck Expo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/npc-pro/id1273077384/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 24 months | **Monthly** |
| Monetization | Free | — |
| Size | 84 MB | 81 MB |
| Requires iOS | **15.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [National Plasters Council, Inc](https://appshunter.io/developer/1273077383) | [Informa Exhibitions U.S. Construction and Real Estate, Inc.](https://appshunter.io/developer/1281092345) |

## What reviewers say

### NPC Pro

[App page](https://appshunter.io/ios/app/npc-pro/id1273077384)

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:** macOS Compatibility

**In-app purchases:** none


### Pool/Spa/Patio/Deck Expo

[App page](https://appshunter.io/ios/app/poolspapatiodeck-expo/id1585045050)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is NPC Pro free?

NPC Pro is free to download, with no in-app purchases.

### Is Pool/Spa/Patio/Deck Expo free?

Pool/Spa/Patio/Deck Expo is free to download, with no in-app purchases.

### Do NPC Pro or Pool/Spa/Patio/Deck Expo have ads?

Neither NPC Pro nor Pool/Spa/Patio/Deck Expo shows ads.

### Which is updated more often, NPC Pro or Pool/Spa/Patio/Deck Expo?

NPC Pro ships an update every 24 months, and Pool/Spa/Patio/Deck Expo monthly. Most recently, NPC Pro was updated on October 24, 2026 and Pool/Spa/Patio/Deck Expo on October 30, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*