Awesome Open Source
Awesome Open Source


High-performance polyline simplification library

SwiftSimplify is a tiny high-performance Swift polyline simplification library ported from Javascript's Simplify.js. Original work come from Leaflet, a JS interactive maps library by Vladimir Agafonkin.

It uses a combination of Douglas-Peucker and Radial Distance algorithms. Works both on browser and server platforms.

Polyline simplification dramatically reduces the number of points in a polyline while retaining its shape, giving a huge performance boost when processing it and also reducing visual noise. For example, it's essential when rendering a 70k-points line chart or a map route in the browser using MapKit.



  • iOS 8.0, watchOS 2.0, tvOS 9.0
  • Swift 5.x+


  • If you found a bug, open an issue.
  • If you have a feature request, open an issue.
  • If you want to contribute, submit a pull request.


SwiftSimplify is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod "SwiftSimplify"


Usage is pretty straightforward: in fact you need just call the SwiftSimplify's class method simplify by passing your configuration:

let allPoints: [Point2DRepresentable] = ...
let simplifiedPoints = SwiftSimplify.simplify(allPoints, tolerance: tolerance)

Allowed parameters are:

  • points: An array of points. SwiftSimplify supports Swift's generic so you can pass an array of objects which are conforms to Point2DRepresentable protocol (both CGPoint and CLLocationCoordinate2D objects supports it).
  • tolerance: (1 by default) Affects the amount of simplification (in the same metric as the point coordinates)
  • highQuality: (false by default) Excludes distance-based preprocessing step which leads to highest quality simplification but runs ~10-20 times slower.

❤️ Your Support

Hi fellow developer!
You know, maintaing and developing tools consumes resources and time. While I enjoy making them your support is foundamental to allow me continue its development.

If you are using SwiftSimplify or any other of my creations please consider the following options:


SwiftSimplify is compatible with Swift 5.x+ under iOS (11+) and macOS platforms.

You can install it via CocoaPods:

pod 'SwiftSimplify'

or SPM in your Package.swift:

import PackageDescription

  let package = Package(name: "YourPackage",
    dependencies: [
      .Package(url: "", majorVersion: 0),

Consider ❤️ support the development of this library!


  • If you need help or you'd like to ask a general question, open an issue.
  • If you found a bug, open an issue.
  • If you have a feature request, open an issue.
  • If you want to contribute, submit a pull request.

Copyright & Acknowledgements

SwiftSimplify is currently owned and maintained by Daniele Margutti.
You can follow me on Twitter @danielemargutti.
My web site is

This software is licensed under MIT License.

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