# NPI SDK vs SII PS Print Class Library

The clearest difference is update cadence: SII PS Print Class Library at every 4 months against NPI SDK's every 9 months. NPI SDK's advantage is iOS requirement (13.0 vs 17.0). 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.

NPI SDK ships an update every 9 months, SII PS Print Class Library every 4 months. The most recent releases landed on October 10, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | NPI SDK | SII PS Print Class Library |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 4 months** |
| Size | 20 MB | 2 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Nippon Primex Inc.](https://appshunter.io/developer/792545796) | [Seiko Instruments Inc.](https://appshunter.io/developer/430532225) |

## What reviewers say

### NPI SDK

[App page](https://appshunter.io/ios/app/npi-sdk/id792545793)

**In-app purchases:** none


### SII PS Print Class Library

[App page](https://appshunter.io/ios/app/sii-ps-print-class-library/id980182499)

**In-app purchases:** none


## Frequently asked questions

### Is NPI SDK free?

NPI SDK is free to download, with no in-app purchases.

### Is SII PS Print Class Library free?

SII PS Print Class Library is free to download, with no in-app purchases.

### Do NPI SDK or SII PS Print Class Library have ads?

Neither NPI SDK nor SII PS Print Class Library shows ads.

### Which is updated more often, NPI SDK or SII PS Print Class Library?

NPI SDK ships an update every 9 months, and SII PS Print Class Library every 4 months. Most recently, NPI SDK was updated on October 10, 2026 and SII PS Print Class Library on September 22, 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.*