Comparison

ACE Library vs Letterloop

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Exclusive eBook access
  • Digital text review
  • Certification exam preparation
  • ACE ProSource articles
  • Offline reading
Features
Read full description

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.

About

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.

Highlights
  • Group newsletter creation
  • Customizable questions
  • Automated newsletter compilation
  • User-submitted questions
  • Archived newsletters
  • Flexible scheduling
Features
Currently charting
Read full description

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/

Screenshots

ACE Library3 screens
Letterloop4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard8 real differences · 3 level
ACE Library versus Letterloop: the parameters behind the verdict, then further details
ParameterACE LibraryLetterloop
PriceFreeFree
Rating2.4 (42 ratings)4.9 (751 ratings) — better
Positive reviews3.3% of reviews91.2% of reviews — better
Number of ratings42751 — better
Update frequencyEvery 5 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterSubscription
Best chart rank—#125 — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better17.0
Further details — not scored
Size75 MB78 MB
Age rating4+4+
DeveloperAmerican Council on Exercise (ACE)Letterloop

Customer experience

ACE Library

All ratings36 ratings
Positive30.6%
Neutral19.4%
Negative50.0%
Written reviews30 reviews
Positive3.3%
Neutral26.7%
Negative70.0%

Letterloop

All ratings746 ratings
Positive96.9%
Neutral1.1%
Negative2.0%
Written reviews227 reviews
Positive91.2%
Neutral1.8%
Negative7.0%

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

None

ACE Library

No in-app purchases

2 purchases

Letterloop

Subscriptions2
  • Monthly Subscription$5.001 Month
  • Annual Subscription$50.001 Year

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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