# Sustainable Libraries vs QT30

The clearest difference is iOS requirement: Sustainable Libraries at 12.0 against QT30's 15.1. On price, rating, ratings volume and update cadence there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for Sustainable Libraries against 5.0 for QT30. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Sustainable Libraries ships an update every 66 months, QT30 every 43 months. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Sustainable Libraries | QT30 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/sustainable-libraries/id1170914405/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/qt30/id1524821063/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 66 months | **Every 43 months** |
| Monetization | Free | Free |
| Size | 12 MB | 52 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Capira Technologies](https://appshunter.io/developer/1010559443) | [ALOYSIUS, BUTLER & CLARK ASSOCIATES, INC.](https://appshunter.io/developer/1524821065) |

## What reviewers say

### Sustainable Libraries

[App page](https://appshunter.io/ios/app/sustainable-libraries/id1170914405)

This app guides library staff through making their institutions more sustainable and resilient. It offers practical steps, resources, and tools to foster environmentally sound, economically feasible, and socially equitable practices.

**Highlights:** Sustainability roadmap guidance, Checklists for sustainable practices, Notes feature for planning, News feed for updates, Content sharing capabilities, Step-by-step task breakdown

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

**In-app purchases:** none


### QT30

[App page](https://appshunter.io/ios/app/qt30/id1524821063)

This app provides daily activities designed to foster 30 minutes of focused, interactive time with a child. It offers 160 evidence-based activities for infants, toddlers, and older children, promoting better health, school performance, and social skills.

**Highlights:** 160 daily quality time activities, Activities for infants, toddlers, and older kids, Evidence-based early learning foundations, Focuses on interaction and connection, Promotes child development and well-being

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Sustainable Libraries free?

Sustainable Libraries is free to download, with no in-app purchases.

### Is QT30 free?

QT30 is free to download, with no in-app purchases.

### Which has better reviews, Sustainable Libraries or QT30?

Sustainable Libraries and QT30 are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do Sustainable Libraries or QT30 have ads?

Neither Sustainable Libraries nor QT30 shows ads.

### Which is updated more often, Sustainable Libraries or QT30?

Sustainable Libraries ships an update every 66 months, and QT30 every 43 months. Most recently, Sustainable Libraries was updated on November 2, 2026 and QT30 on November 3, 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.*