# Open Polytechnic Library vs STH App

The clearest difference is update cadence: STH App at every 3 weeks against Open Polytechnic Library's every 43 months. STH App also leads on iOS requirement (15.0 vs 26.0). 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.

Open Polytechnic Library ships an update every 43 months, STH App every 3 weeks. The most recent releases landed on September 30, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Open Polytechnic Library | STH App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.3 (4 ratings)](https://appshunter.io/ios/app/sth-app/id6448138159/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 40.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 43 months | **Every 3 weeks** |
| Monetization | — | Free |
| Size | 43 MB | 84 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 9+ |
| Developer | [Stacks Inc.](https://appshunter.io/developer/1275752393) | [Taniela Mafileo](https://appshunter.io/developer/1630288368) |

## What reviewers say

### Open Polytechnic Library

[App page](https://appshunter.io/ios/app/open-polytechnic-library/id6443709955)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


### STH App

[App page](https://appshunter.io/ios/app/sth-app/id6448138159)

Access and manage hymns and songs from the Siasi 'O Tonga Hou'eiki on your mobile device. Search, save, and share your favorite hymns, with day and night modes available. New songs will be added through updates.

**Highlights:** Search hymns by number or title, Save favorite hymns, Share hymns online, Day and Night Mode, Access Hiva Usu songs, Receive new song updates

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

**In-app purchases:** none


## Frequently asked questions

### Is Open Polytechnic Library free?

Open Polytechnic Library is free to download, with no in-app purchases.

### Is STH App free?

STH App is free to download, with no in-app purchases.

### Do Open Polytechnic Library or STH App have ads?

Neither Open Polytechnic Library nor STH App shows ads.

### Which is updated more often, Open Polytechnic Library or STH App?

Open Polytechnic Library ships an update every 43 months, and STH App every 3 weeks. Most recently, Open Polytechnic Library was updated on September 30, 2026 and STH App 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.*