Kingfisher vs SwifterSwift
Which should you use? A side-by-side look at what each one does, who it suits, what it costs, how hard it is to set up, and where each falls short.
Open source · MIT
A Swift library that downloads, caches, and displays images from the web in apps.
Open source · MIT
A library of over 500 ready-made Swift extensions that add handy helper methods to common types.
The short answer
Choose Kingfisher if you need…
- iOS or macOS developers who need to show remote images in lists or detail screens
- Teams building SwiftUI apps that display images from URLs
- Developers who want caching and resizing handled by a library instead of written by hand
- Projects that only need to use parts of the library, such as the downloader or the cache, separately
Choose SwifterSwift if you need…
- Swift developers building iOS or macOS apps who want common helper methods ready to use
- Teams that want to pick only the extension groups they need, such as UIKit or CoreLocation
- Developers who prefer Swift Package Manager, CocoaPods, or Carthage for dependencies
Side-by-side
| Kingfisher | SwifterSwift | |
|---|---|---|
| Type | Library | Library |
| Price | Free and open source | Free and open source |
| Licence | MIT | MIT |
| GitHub stars | 24.4k | 15.3k |
| Setup difficulty | Beginner | Beginner |
| How you get it | Install with a package manager | Install with a package manager |
| Main language | Swift | Swift |
| Last code update | 4 days ago | 4 days ago |
What each one is
Kingfisher
Kingfisher is a Swift library for loading images from URLs into iOS, macOS, tvOS, watchOS and visionOS apps. It downloads an image, keeps it in memory and on disk, and reuses the cached copy the next time the same URL is requested. It also offers image processors such as downsampling and rounded corners, and works with both UIKit/AppKit views and SwiftUI.
SwifterSwift
SwifterSwift is a collection of more than 500 Swift extensions, which are small added methods for built-in types like strings, arrays, and UIKit or Cocoa classes. It is meant to save developers from writing the same helper code again and again across iOS, macOS, tvOS, watchOS, Linux, and Android projects.
Best for
Kingfisher
- iOS or macOS developers who need to show remote images in lists or detail screens
- Teams building SwiftUI apps that display images from URLs
- Developers who want caching and resizing handled by a library instead of written by hand
- Projects that only need to use parts of the library, such as the downloader or the cache, separately
SwifterSwift
- Swift developers building iOS or macOS apps who want common helper methods ready to use
- Teams that want to pick only the extension groups they need, such as UIKit or CoreLocation
- Developers who prefer Swift Package Manager, CocoaPods, or Carthage for dependencies
Strengths
Kingfisher
- Caches images in both memory and disk, so repeated loads of the same URL are fast
- Supports UIKit, AppKit, and SwiftUI, with examples for each in the README
- Components such as the downloader, cache, and processors can be used independently
SwifterSwift
- Covers a large range of types, with more than 500 extensions organized by module
- Supports several dependency managers, including Swift Package Manager, CocoaPods, Carthage, and Accio
- Licensed under MIT, which allows free use in commercial projects
Not ideal for
Kingfisher
- Non-Swift projects, since the library is written in pure Swift for Apple platforms (reason: it does not run on Android or the web)
- Apps with unusual caching rules that go beyond the expiration and size controls described in the README (reason: those controls may not cover every case)
- Developers on Swift versions older than the ones listed for their chosen Kingfisher release (reason: requirements differ by major version)
SwifterSwift
- Beginners still learning Swift basics, since the library assumes you can read and call extensions yourself
- Projects that must support Swift versions older than the ones listed in the requirements, because the README points to older tagged releases instead
- Anyone who wants a full app or framework rather than a set of helper methods
Trade-offs
Kingfisher
- Only works on Apple platforms and requires Xcode and Swift
- Minimum OS versions and Swift versions depend on the release, so older projects may need to pin an older major version
- The README is truncated, so details on advanced configuration are only available in the linked external documentation
SwifterSwift
- Helper methods add to your dependency footprint, and you should check each one fits your needs
- Requirements are fairly recent, such as iOS 15.0+ and Swift 6.0+, so older projects may not be able to upgrade easily
- The README is truncated here, so details of individual extensions and the latest release notes were not verified
Getting started
Kingfisher
Add via Swift Package Manager in Xcode
File > Swift Packages > Add Package DependencyRepository URL to add
https://github.com/onevcat/Kingfisher.gitSwifterSwift
CocoaPods: add to Podfile (all extensions)
pod 'SwifterSwift'Carthage: add to Cartfile
github "SwifterSwift/SwifterSwift" ~> 6.0Frequently asked questions
What is the difference between Kingfisher and SwifterSwift?
Kingfisher: A Swift library that downloads, caches, and displays images from the web in apps. SwifterSwift: A library of over 500 ready-made Swift extensions that add handy helper methods to common types. Kingfisher suits ios or macos developers who need to show remote images in lists or detail screens, while SwifterSwift suits swift developers building ios or macos apps who want common helper methods ready to use.
Are Kingfisher and SwifterSwift free?
Kingfisher: Free and open source. SwifterSwift: Free and open source.
Is Kingfisher or SwifterSwift more popular?
Kingfisher has more GitHub stars (24.4k) than SwifterSwift (15.3k). Popularity isn't the same as fit — check which one matches your use case above.
What are other alternatives to Kingfisher and SwifterSwift?
Other options people compare them with include SDWebImage, List.js, SnapKit, SVProgressHUD, Eureka.
Keep comparing
Built from our catalogue entries for both products: open-source details come from each project's README (AI-assisted, refreshed weekly) and GitHub data; AI-tool details are editorial. Spotted something wrong? Let us know from either product's page.