ACE Library vs Letterloop
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ACE Library
Access and store purchased eBooks from ACE. Review digital texts to prepare for certification exams. Includes additional ACE ProSource articles for further reading.
- Exclusive eBook access
- Digital text review
- Certification exam preparation
- ACE ProSource articles
- Offline reading
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The ACE Library is an exclusive access and storage application for customers who have purchased eBooks from ACE. eBook purchasers may use it to review digital texts as they prepare for ACE Certification exams. For additional reading, a number of ACE ProSource articles are housed in the library and available upon download of the app.
Letterloop
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.
- Group newsletter creation
- Customizable questions
- Automated newsletter compilation
- User-submitted questions
- Archived newsletters
- Flexible scheduling
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Letterloop is a fun way to have a group newsletter without the work. You pick the questions for your group to answer, then Letterloop creates a fun and beautiful newsletter with everyone's replies. All you need is to do is invite your people! How does Letterloop work? We crafted a set of questions designed to spark fun and thoughtful replies. The questions range from updates about your week to thoughts on identity, life stories, and personal philosophies. Each newsletter cycle, we'll suggest a few questions for you. You can always swap questions or add your own. Plus, members of your newsletter can ask their own questions that you can include too. Who uses Letterloop? Groups of all kinds use Letterloop to grow close together, even when far apart. - Families - Friends - Teams - Universities - Clubs & Masterminds - Youth Groups - Communities Why Letterloop? - Stay in touch, grow closer together, and discover things you never knew with the people in your life - Let everyone ask and answer fun & interesting questions that don't normally come up in group chats or video calls - Customize your Letterloop's content, schedule, and settings to match your group's interests and personalities - Reschedule, pause, or extend a Letterloop issue as needed - Access unlimited archives of your Letterloop's historical issues - You're always in full control of your Letterloop data — no ads, ever Letterloop Subscription - You may purchase an auto-renewing subscription through an In-App Purchase. - Subscriptions include Letterloop Monthly ($5.00/month) and Letterloop Annual ($50.00/year) - Your subscription will be charged to your iTunes account at confirmation of purchase and will automatically renew (at the duration selected) unless auto-renew is turned off at least 24 hours before the end of the current period. - Current subscription may not be cancelled during the active subscription period; however, you can manage your subscription and/or turn off auto-renewal by visiting your iTunes Account Settings after purchase Privacy Policy: https://www.letterloop.co/privacy-policy Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | ACE Library | Letterloop |
|---|---|---|
| Price | Free | Free |
| Rating | 2.4 (42 ratings) | 4.9 (751 ratings) — better |
| Positive reviews | 3.3% of reviews | 91.2% of reviews — better |
| Number of ratings | 42 | 751 — better |
| Update frequency | Every 5 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Subscription |
| Best chart rank | — | #125 — better |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 75 MB | 78 MB |
| Age rating | 4+ | 4+ |
| Developer | American Council on Exercise (ACE) | Letterloop |
Customer experience
ACE Library
Letterloop
Bugs and requests
ACE Library
Not enough reviews yet to summarise bugs or requests.
Letterloop
Reported bugs
2 issues- Login and subscription issues
- Functionality problems after initial free period
Requested features
5 requests- 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
In-app purchases
ACE Library
No in-app purchases
Letterloop
- Monthly Subscription$5.001 Month
- Annual Subscription$50.001 Year









