# Sustainable Libraries vs READsquared

The clearest difference is rating: Sustainable Libraries at 5.0 against READsquared's 2.0. Sustainable Libraries also leads on iOS requirement (12.0 vs 15.0). READsquared's advantage is update cadence (every 2 months vs every 66 months) and ratings volume (16 vs 1). 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.

Sustainable Libraries holds the better App Store score, 5.0 against 2.0. That said, the two scores are not equally well evidenced: READsquared has 16 ratings behind it against 1, so its average is the more settled of the two.

Sustainable Libraries ships an update every 66 months, READsquared every 2 months. The most recent releases landed on September 23, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Sustainable Libraries | READsquared |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sustainable-libraries/id1170914405/reviews)** | [2.0 (16 ratings)](https://appshunter.io/ios/app/readsquared/id1455248996/reviews) |
| Number of ratings | 1 | **16** |
| Positive reviews | — | 17.5% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 66 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 12 MB | 2 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Capira Technologies](https://appshunter.io/developer/1010559443) | [Systems Technology Group Incorporated](https://appshunter.io/developer/1455248815) |

## 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

**In-app purchases:** none


### READsquared

[App page](https://appshunter.io/ios/app/readsquared/id1455248996)

This app enables users to participate in library reading programs by tracking reading and logging activity. Earn digital badges, play learning games, and receive incentives from your library. Parents can manage all family accounts, viewing reading progress and statistics.

**Highlights:** Track reading and activity, Log reading for family members, Unlock digital badges, Play learning games, Receive library incentives, Manage family accounts

**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 READsquared free?

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

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

Sustainable Libraries is rated higher. Sustainable Libraries averages 5.0 out of 5 from 1 ratings, while READsquared averages 2.0 from 16 ratings.

### Do Sustainable Libraries or READsquared have ads?

Neither Sustainable Libraries nor READsquared shows ads.

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

Sustainable Libraries ships an update every 66 months, and READsquared every 2 months. Most recently, Sustainable Libraries was updated on September 23, 2026 and READsquared on September 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.*