Latest 0.3.0
License MIT
Platforms ios 8.0, osx 10.9, watchos 2.0, tvos 9.0, requires ARC

SpeedLog – 🚀🐌

CI Status
Carthage compatible

SpeedLog – Fast Debug logging, easy to disable and improve Swift performance optimization

The Swift print statements aren’t emitted when compiling in Release mode with enabled optimization. This prevents Swift from performing optimal code optimization.

The SpeedLog allows you to remove print when the logs are disabled. This allows Swift compiler to perform optimal code optimization and increase application performance.


  • [x] Improves Swift code optimization
  • [x] Easy to disable
  • [x] Reach formatting
  • [x] Coloured console output
  • [x] Custom UIColor representation


import SpeedLog
SpeedLog.print(["Super"], ["Speed"])

Log output Styling

SpeedLog.mode = .FuncName
SpeedLog.print("Show only FunctionName")
//myFunc(): Show only FunctionName

SpeedLog.mode = [.FuncName, .FileName]
SpeedLog.print("Show FunctionName and File name")
//AppDelegate.myFunc(): Show FunctionName and File name

SpeedLog.mode = [.FuncName, .FileName, .Line]
SpeedLog.print("Show 3 options :)")
//AppDelegate.myFunc()[36]: Show 3 options :)

SpeedLog.mode = .FullCodeLocation
SpeedLog.print("Show fullCode, same as above")
//AppDelegate.myFunc()[39]: Show fullCode, same as above

SpeedLog.mode = .AllOptions
SpeedLog.print("Enable All Features")
//2015-11-26 19:32:33.687 AppDelegate.myFunc()[27]: Enable All Features

UIColor log

SpeedLog has nice UIColor log style.
All you need to do is enable it once by calling SpeedLog.enableVisualColorLog()


SpeedLog.print("Visual:", c)

SpeedLog.print("Original Restored:", c)

P.S – You also need to install XcodeColors Xcode Plugin. Use Alcatraz to install it.

Enables Log

To enables logs you need to add a Swift Compiler ENABLE_LOG flag

  1. Go to: Build Settings -> Swift Compiler – Custom Flags
  2. Add -D ENABLE_LOG flag

If you use use CocoaPods or Carthage you need to enable it for SpeedLog framework, not the project itself.

See more details at Stackoverflow



To install it, simply add the following line to your Podfile:

pod "SpeedLog"


To integrate SpeedLog into your Xcode project using Carthage, specify it in your Cartfile:

github "kostiakoval/SpeedLog"

*`** Carthage builds frameworks inReleasemode. This mean if you runcarthage updateand includeSpeedLog.framework` to the project no output will be printed to console, because it’s not printed in release mode.

How to use Carthage with SpeedLog:

  • Runcarthage checkout
  • Open Carthage/Checkouts/SpeedLog and add SpeedLog.xcodeproj to your project.


Copy the SpeedLog.swift file into your project


In order to use colorised console you need to install XcodeColors Xcode plugin.
Use Alcatraz to install it. Go to:
Xcode -> Window -> Package Manager -> Search for XcodeColors and install it

Future Features

There are many logging libs I like:

But there is one problem with all of them – it’s not possible to disable them before compiling Swift code.

Next step is:
Get the best features from those libs and integrate them into SpeedLog

To Do:

  • [ ] Different log levels (debug, info, verbose, etc)
  • [ ] Log to a file
  • [ ] Lazy code evaluation (@autoclosure) for log


Please open an issue with bugs and missing features, functionality or ideas for improvements.
Also you can contribute by following these guidelines:

  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create pull request


Kostiantyn Koval, thats me :)

Thanks to Arthur Ariel Sabintsev for his PrintlnMagic lib


SpeedLog is available under the MIT license. See the LICENSE file for more info.

Latest podspec

    "name": "SpeedLog",
    "version": "0.3.0",
    "summary": "SpeedLog - Swift fast debug logs, improves code optimization",
    "description": "SpeedLog can be easily disabled and removed for the release build.nThis would increase code performance and enable better optimizationnfor swift compiler",
    "homepage": "",
    "license": "MIT",
    "authors": {
        "Kostiantyn Koval": "[email protected]"
    "source": {
        "git": "",
        "tag": "0.3.0"
    "social_media_url": "",
    "platforms": {
        "ios": "8.0",
        "osx": "10.9",
        "watchos": "2.0",
        "tvos": "9.0"
    "requires_arc": true,
    "source_files": "Source/**/*.swift",
    "watchos": {
        "exclude_files": "Source/UIKit"
    "osx": {
        "exclude_files": "Source/UIKit"
    "pod_target_xcconfig": {
    "pushed_with_swift_version": "3.0"

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