diff --git a/src/components/RenderViewerArtifacts.tsx b/src/components/RenderViewerArtifacts.tsx
index a639be787..de86fef5e 100644
--- a/src/components/RenderViewerArtifacts.tsx
+++ b/src/components/RenderViewerArtifacts.tsx
@@ -17,6 +17,7 @@ import { useStore } from '../useStore'
 import { isOverlap, roundOff } from '../lib/utils'
 import { Vector3, DoubleSide, Quaternion } from 'three'
 import { useSetCursor } from '../hooks/useSetCursor'
+import { getConstraintLevelFromSourceRange } from '../lang/std/sketchcombos'
 
 function MovingSphere({
   geo,
@@ -416,25 +417,43 @@ function LineRender({
   rotation: Rotation
   position: Position
 }) {
-  const { setHighlightRange } = useStore((s) => ({
+  const { setHighlightRange, guiMode, ast } = useStore((s) => ({
     setHighlightRange: s.setHighlightRange,
+    guiMode: s.guiMode,
+    ast: s.ast,
   }))
   const onClick = useSetCursor(sourceRange)
   // This reference will give us direct access to the mesh
   const ref = useRef<BufferGeometry | undefined>() as any
   const [hovered, setHover] = useState(false)
 
+  const [baseColor, setBaseColor] = useState('orange')
+  useEffect(() => {
+    if (!ast || guiMode.mode !== 'sketch') {
+      setBaseColor('orange')
+      return
+    }
+    const level = getConstraintLevelFromSourceRange(sourceRange, ast)
+    if (level === 'free') {
+      setBaseColor('orange')
+    } else if (level === 'partial') {
+      setBaseColor('IndianRed')
+    } else if (level === 'full') {
+      setBaseColor('lightgreen')
+    }
+  }, [guiMode, ast, sourceRange])
+
   return (
     <>
       <mesh
         quaternion={rotation}
         position={position}
         ref={ref}
-        onPointerOver={(event) => {
+        onPointerOver={(e) => {
           setHover(true)
           setHighlightRange(sourceRange)
         }}
-        onPointerOut={(event) => {
+        onPointerOut={(e) => {
           setHover(false)
           setHighlightRange([0, 0])
         }}
@@ -442,7 +461,7 @@ function LineRender({
       >
         <primitive object={geo} />
         <meshStandardMaterial
-          color={hovered ? 'hotpink' : forceHighlight ? 'skyblue' : 'orange'}
+          color={hovered ? 'hotpink' : forceHighlight ? 'skyblue' : baseColor}
         />
       </mesh>
     </>
diff --git a/src/lang/std/sketchcombos.test.ts b/src/lang/std/sketchcombos.test.ts
index a8e20db5a..22bd2853c 100644
--- a/src/lang/std/sketchcombos.test.ts
+++ b/src/lang/std/sketchcombos.test.ts
@@ -6,6 +6,7 @@ import {
   transformAstSketchLines,
   transformSecondarySketchLinesTagFirst,
   ConstraintType,
+  getConstraintLevelFromSourceRange,
 } from './sketchcombos'
 import { initPromise } from '../rust'
 import { TooTip } from '../../useStore'
@@ -429,3 +430,64 @@ function helperThing(
   })?.modifiedAst
   return recast(newAst)
 }
+
+describe('testing getConstraintLevelFromSourceRange', () => {
+  it('should devide up lines into free, partial and fully contrained', () => {
+    const code = `const baseLength = 3
+const baseThick = 1
+const armThick = 0.5
+const totalHeight = 4
+const armAngle = 60
+const totalLength = 9.74
+const yDatum = 0
+
+const baseThickHalf = baseThick / 2
+const halfHeight = totalHeight / 2
+const halfArmAngle = armAngle / 2
+
+const part001 = startSketchAt([-0.01, -0.05])
+  |> line([0.01, 0.94 + 0], %) // partial
+  |> xLine(3.03, %) // partial
+  |> angledLine({
+  angle: halfArmAngle,
+  length: 2.45,
+  tag: 'seg01bing'
+}, %) // partial
+  |> xLine(4.4, %) // partial
+  |> yLine(-1, %) // partial
+  |> xLine(-4.2 + 0, %) // full
+  |> angledLine([segAng('seg01bing', %) + 180, 1.79], %) // partial
+  |> line([1.44, -0.74], %) // free
+  |> xLine(3.36, %) // partial
+  |> line([-1.49, 1.06], %) // free
+  |> xLine(-3.43 + 0, %) // full
+  |> angledLineOfXLength([243 + 0, 1.2 + 0], %) // full
+show(part001)`
+    const ast = abstractSyntaxTree(lexer(code))
+    const constraintLevels: ReturnType<
+      typeof getConstraintLevelFromSourceRange
+    >[] = ['full', 'partial', 'free']
+    constraintLevels.forEach((constraintLevel) => {
+      const recursivelySeachCommentsAndCheckConstraintLevel = (
+        str: string,
+        offset: number = 0
+      ): null => {
+        const index = str.indexOf(`// ${constraintLevel}`, offset)
+        if (index === -1) {
+          return null
+        }
+        const offsetIndex = index - 7
+        const expectedConstraintLevel = getConstraintLevelFromSourceRange(
+          [offsetIndex, offsetIndex],
+          ast
+        )
+        expect(expectedConstraintLevel).toBe(constraintLevel)
+        return recursivelySeachCommentsAndCheckConstraintLevel(
+          str,
+          index + constraintLevel.length
+        )
+      }
+      recursivelySeachCommentsAndCheckConstraintLevel(code)
+    })
+  })
+})
diff --git a/src/lang/std/sketchcombos.ts b/src/lang/std/sketchcombos.ts
index c0631eb8f..3c1bdbef9 100644
--- a/src/lang/std/sketchcombos.ts
+++ b/src/lang/std/sketchcombos.ts
@@ -1220,3 +1220,38 @@ function createLastSeg(isX: boolean): CallExpression {
 function getArgLiteralVal(arg: Value): number {
   return arg?.type === 'Literal' ? Number(arg.value) : 0
 }
+
+export function getConstraintLevelFromSourceRange(
+  cursorRange: Range,
+  ast: Program
+): 'free' | 'partial' | 'full' {
+  const { node: sketchFnExp } = getNodeFromPath<CallExpression>(
+    ast,
+    getNodePathFromSourceRange(ast, cursorRange)
+  )
+  const name = sketchFnExp?.callee?.name as TooTip
+  if (!toolTips.includes(name)) return 'free'
+
+  const firstArg = getFirstArg(sketchFnExp)
+
+  // check if the function is fully constrained
+  if (Array.isArray(firstArg.val)) {
+    const [a, b] = firstArg.val
+    if (a?.type !== 'Literal' && b?.type !== 'Literal') return 'full'
+  } else {
+    if (firstArg.val?.type !== 'Literal') return 'full'
+  }
+
+  // check if the function has no constraints
+  const isTwoValFree =
+    Array.isArray(firstArg.val) &&
+    firstArg.val?.[0]?.type === 'Literal' &&
+    firstArg.val?.[1]?.type === 'Literal'
+  const isOneValFree =
+    !Array.isArray(firstArg.val) && firstArg.val?.type === 'Literal'
+
+  if (isTwoValFree) return 'free'
+  if (isOneValFree) return 'partial'
+
+  return 'partial'
+}