# KCLS vs ACE Library

The clearest difference is rating: KCLS at 3.9 against ACE Library's 2.6. KCLS also leads on review sentiment (28% vs 3%). On price, ratings volume, update cadence and ads there is nothing between them.

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

KCLS holds the better App Store score, 3.9 against 2.6. Both are backed by a comparable volume of ratings — 16 and 36 respectively. Written reviews point the same way: 28% of KCLS's written reviews are positive against 3% of ACE Library's.

KCLS ships an update every 3 months, ACE Library every 5 months. The most recent releases landed on September 29, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | KCLS | ACE Library |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.9 (16 ratings)](https://appshunter.io/ios/app/kcls/id746221889/reviews)** | [2.6 (36 ratings)](https://appshunter.io/ios/app/ace-library/id894077537/reviews) |
| Number of ratings | 16 | **36** |
| Positive reviews | **27.5% of reviews** | 3.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 5 months |
| Monetization | Free | Free |
| Size | 22 MB | 75 MB |
| Requires iOS | 16.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [King County Library System](https://appshunter.io/developer/470795180) | [American Council on Exercise (ACE)](https://appshunter.io/developer/816467405) |

## What reviewers say

### KCLS

[App page](https://appshunter.io/ios/app/kcls/id746221889)

Manage your library account conveniently from your mobile device. Discover new books, place holds, renew borrowed items, and easily locate library branches and their hours.

**Highlights:** Discover and search library collection, Place, manage, and cancel holds, Renew borrowed items, Rate and save titles, Find library locations and hours, Browse bestsellers and new arrivals

**Features:** Apple Wallet

**In-app purchases:** none

**What reviewers like**

- 👍 Easy to log in
- 👍 Fun books to read
- 👍 Excellent app
- 👍 Helpful for all ages
- 👍 Convenient for managing holds

**What reviewers complain about**

- 🐛 Unreliable app
- 🐛 Constant sign in issues
- 🐛 Failed sign in attempts count against user
- 🐛 Return book function doesn't work
- 🐛 Search bar coded too narrowly

**Reported bugs**

- Keeps logging out
- Constant sign in issues
- Failed sign in attempts count against user
- Return book function doesn't work
- Search bar coded too narrowly

**Requested features**

- Correct misspellings in search
- Allow less than exact search terms
- Auto-correction in search
- Word suggestion in search
- Dark mode option


### 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


## Frequently asked questions

### Is KCLS free?

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

### Is ACE Library free?

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

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

KCLS is rated higher. KCLS averages 3.9 out of 5 from 16 ratings, while ACE Library averages 2.6 from 36 ratings.

### Do KCLS or ACE Library have ads?

Neither KCLS nor ACE Library shows ads.

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

KCLS ships an update every 3 months, and ACE Library every 5 months. Most recently, KCLS was updated on September 29, 2026 and ACE Library on October 7, 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.*