The charts your AI writes, as native graphics in your app.

LLMs and agents write Vega-Lite well. PlotKit draws it with Core Graphics on iPhone, iPad and Mac, without a WebView.

In development.

PlotKit renders all 616 official Vega-Lite examples. Here is one from each group of the gallery, rendered on a Mac straight from PlotKit's source.

Status comes from the support matrix. Supported: every test spec that uses it matches the reference renderer within tolerance. Partial: a few test specs miss the tolerance. Divergent: works, but behaves differently from the web reference. Untested: no test spec exercises it yet. An example takes the lowest status among its marks.

Bar
219 examples
Graded Partial: a few test specs with bars miss the tolerance at antialiased edges or in shading.
Line
112 examples
Graded Partial: a few test specs with lines miss the tolerance in canvas size or in shading.
Point
229 examples
Graded Supported: every test spec with points matches the reference.
Interactive
101 examples
Brushes, point selections and legend filters run natively. Tooltips still differ from the web.

One view in SwiftUI.

Hand ChartView the spec as text. It compiles the spec off the main thread and draws vectors into a SwiftUI canvas, so the chart stays sharp at any size.

RevenueChart.swift

import SwiftUI
import PlotKitUI

struct RevenueChart: View {
  let spec: String  // Vega-Lite JSON, from your server or a file

  var body: some View {
    ChartView(json: spec)
      .chartSizing(.fit)
      .chartTheme(.automatic)
  }
}

bar.vl.json

{
  "$schema": "https://vega.github.io/schema/vega-lite/v5.json",
  "description": "A simple bar chart with embedded data.",
  "data": {
    "values": [
      {"a": "A", "b": 28}, {"a": "B", "b": 55}, {"a": "C", "b": 43},
      {"a": "D", "b": 91}, {"a": "E", "b": 81}, {"a": "F", "b": 53},
      {"a": "G", "b": 19}, {"a": "H", "b": 87}, {"a": "I", "b": 52}
    ]
  },
  "mark": "bar",
  "encoding": {
    "x": {"field": "a", "type": "nominal", "axis": {"labelAngle": 0}},
    "y": {"field": "b", "type": "quantitative"}
  }
}

What renders, measured.

PlotKit is tested against vl-convert 1.9.0, the reference renderer for Vega-Lite. A spec passes when 99% of its pixels agree within 8/255 per channel, at a 0.5 px grid.

110 of 124 test specs match the reference.
118 of 119 text labels land within half a pixel.
43 of 49 feature fixtures pass.

Mark	Status	Note
arc	Supported
area	Supported
bar	Partial	Edges, Shading
boxplot	Supported
circle	Partial	Shading
errorband	Untested
errorbar	Supported
geoshape	Supported
image	Supported
line	Partial	Canvas size, Shading
point	Supported
rect	Partial	Edges, Shading
rule	Partial	Edges, Shading
square	Partial	Edges
text	Partial	Edges
tick	Supported
trail	Untested

Interaction	Status	Tested on
Tooltips	Divergent	42 specs
Point selection (click)	Supported	7 specs
Interval selection (brush)	Supported	7 specs
Legend binding (doubleClick)	Supported	19 specs
Wheel zoom (bind: scales, and brush zoom)	Divergent	7 specs
Hover (pointerover) highlight	Supported	15 specs

Where it differs

Edges: Core Graphics and the reference antialias edges differently; the geometry matches. (8 specs)
Shading: interior fills differ on a few specs. (5 specs)
Canvas size: one spec comes out a different size. (1)

Generated from PlotKit's conformance run on 11 September 2026.

On an iPad.

9.6 msto compile a simple chart

99 msfrom a cold launch to the first image

94.6 msto compile an 8,000-point scatter plot

iPad Air (M1), iPadOS 26.6.1, Release build. Medians.

Requirements and limits.

Rendering core (PlotKitCore): iOS 17, macOS 14, visionOS 1
SwiftUI view (PlotKitUI): iOS 17 and macOS 14
Language: Swift 6
Dependencies: none beyond the system's JavaScriptCore
Engine: Vega 5.33.1 and Vega-Lite 5.21.0, bundled and pinned
Data size: up to 8,000 inline rows per chart. Above that it warns and still draws.
Not yet driven: animation, timers and keyboard events. The first frame is drawn.

PlotKit is in development.

It isn't for sale yet. Join the waitlist at the Silkway Store and you'll hear when it is.

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