# ACE Library vs Letterloop

The clearest difference is review sentiment: Letterloop at 91% against ACE Library's 3%. Letterloop also leads on rating (4.9 vs 2.4) and update cadence (every 2 weeks vs every 5 months). ACE Library's advantage is in-app purchases (none vs 2) and iOS requirement (15.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Letterloop sells 2 in-app purchases, starting at $5.00 per month. ACE Library asks for nothing beyond the download.

Letterloop holds the better App Store score, 4.9 against 2.4. That said, the two scores are not equally well evidenced: Letterloop has 751 ratings behind it against 42, so its average is the more settled of the two. Written reviews point the same way: 3% of ACE Library's written reviews are positive against 91% of Letterloop's.

ACE Library ships an update every 5 months, Letterloop every 2 weeks. The most recent releases landed on October 23, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | ACE Library | Letterloop |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.4 (42 ratings)](https://appshunter.io/ios/app/ace-library/id894077537/reviews) | **[4.9 (751 ratings)](https://appshunter.io/ios/app/letterloop-group-newsletters/id6468623700/reviews)** |
| Number of ratings | 42 | **751** |
| Positive reviews | 3.3% of reviews | **91.2% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 2 weeks** |
| Monetization | **Free** | Subscription |
| Best chart rank | — | **#125** |
| Size | 75 MB | 78 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [American Council on Exercise (ACE)](https://appshunter.io/developer/816467405) | [Letterloop](https://appshunter.io/developer/1710306872) |

## What reviewers say

### ACE Library

[App page](https://appshunter.io/ios/app/ace-library/id894077537)

Access and store purchased eBooks from ACE. Review digital texts to prepare for certification exams. Includes additional ACE ProSource articles for further reading.

**Highlights:** Exclusive eBook access, Digital text review, Certification exam preparation, ACE ProSource articles, Offline reading

**Features:** macOS Compatibility

**In-app purchases:** none


### Letterloop

[App page](https://appshunter.io/ios/app/letterloop-group-newsletters/id6468623700)

**Currently charting:** #125 Top Grossing · Book (US App Store)

Easily create and share group newsletters with friends, family, or teams. The app provides curated questions to spark engaging replies, automatically compiling them into a beautiful newsletter. Stay connected and discover more about the people in your life.

**Highlights:** Group newsletter creation, Customizable questions, Automated newsletter compilation, User-submitted questions, Archived newsletters, Flexible scheduling

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $5.00 | per month |
| Annual Subscription | $50.00 | per year |

**What reviewers like**

- 🤗 Excellent way to stay connected
- 👥 Helps maintain long-distance friendships
- 🎨 Customizable and user-friendly
- 💕 Brings families and friends closer
- 🗓️ Convenient monthly updates

**What reviewers complain about**

- 💰 Subscription cost not transparent
- 🔒 Paywall after initial free issues
- 🤖 Lack of Android support
- 🐛 Technical issues and bugs

**Reported bugs**

- Login and subscription issues
- Functionality problems after initial free period

**Requested features**

- Ability to add multiple photos per issue
- Option to link external content (videos, podcasts, etc.)
- Ability to caption photos
- Save progress when answering questions
- Improved comment section layout


## Frequently asked questions

### Is ACE Library free?

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

### Is Letterloop free?

Letterloop is free to download, with in-app purchases available.

### Which has better reviews, ACE Library or Letterloop?

Letterloop is rated higher. ACE Library averages 2.4 out of 5 from 42 ratings, while Letterloop averages 4.9 from 751 ratings.

### Do ACE Library or Letterloop have ads?

Neither ACE Library nor Letterloop shows ads.

### Which is updated more often, ACE Library or Letterloop?

ACE Library ships an update every 5 months, and Letterloop every 2 weeks. Most recently, ACE Library was updated on October 23, 2026 and Letterloop on October 27, 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.*