# NSI Pro vs Ply Inventory

The clearest difference is rating: Ply Inventory at 5.0 against NSI Pro's 3.0. Ply Inventory also leads on update cadence (weekly vs every 2 weeks) and ratings volume (11 vs 2). NSI Pro's advantage is iOS requirement (11.0 vs 16.0). On price, ads, in-app purchases and monetization model there is nothing between them.

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

Ply Inventory holds the better App Store score, 5.0 against 3.0. That said, the two scores are not equally well evidenced: Ply Inventory has 11 ratings behind it against 2, so its average is the more settled of the two.

NSI Pro ships an update every 2 weeks, Ply Inventory weekly. The most recent releases landed on October 24, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | NSI Pro | Ply Inventory |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.0 (2 ratings)](https://appshunter.io/ios/app/nsi-pro/id1479575341/reviews) | **[5.0 (11 ratings)](https://appshunter.io/ios/app/ply-inventory/id6447880252/reviews)** |
| Number of ratings | 2 | **11** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Weekly** |
| Monetization | Free | Free |
| Size | 30 MB | 73 MB |
| Requires iOS | **11.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [National Comfort Institute, Inc.](https://appshunter.io/developer/1097845247) | [Ply Financial, Inc](https://appshunter.io/developer/1682906456) |

## What reviewers say

### NSI Pro

[App page](https://appshunter.io/ios/app/nsi-pro/id1479575341)

This app allows NCI-Certified Contractors to activate and pair with National Safety Instruments' Bluetooth-enabled low-level carbon monoxide monitors. It specifically supports devices like the NSI 6000 for professional use.

**Highlights:** Bluetooth connectivity, Device activation, Monitor pairing, Carbon monoxide monitoring, NSI 6000 support

**In-app purchases:** none


### Ply Inventory

[App page](https://appshunter.io/ios/app/ply-inventory/id6447880252)

Manage your business inventory with automated supplier pricing and streamlined kit requests. This app offers improved performance and stability for a smoother user experience.

**Highlights:** Automated supplier pricing for POs, Request whole kits for field requests, Faster performance, Fewer crashes, Simplified inventory tracking

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

**In-app purchases:** none


## Frequently asked questions

### Is NSI Pro free?

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

### Is Ply Inventory free?

Ply Inventory is free to download, with no in-app purchases.

### Which has better reviews, NSI Pro or Ply Inventory?

Ply Inventory is rated higher. NSI Pro averages 3.0 out of 5 from 2 ratings, while Ply Inventory averages 5.0 from 11 ratings.

### Do NSI Pro or Ply Inventory have ads?

Neither NSI Pro nor Ply Inventory shows ads.

### Which is updated more often, NSI Pro or Ply Inventory?

NSI Pro ships an update every 2 weeks, and Ply Inventory weekly. Most recently, NSI Pro was updated on October 24, 2026 and Ply Inventory on October 30, 2026.

---

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