diff --git a/LintLanguageDocs.md b/LintLanguageDocs.md
index 3bd0ecd4..d3b7210c 100644
--- a/LintLanguageDocs.md
+++ b/LintLanguageDocs.md
@@ -37,6 +37,7 @@ Aggregates
 {min: Variable | Number[]}
 {max: Variable | Number[]}
 {mean: Variable | Number[]}
+{std: Variable | Number[]}
 {first: Variable | Number[]}
 {last: Variable | Number[]}
 {extent: Variable | Number[]}
@@ -50,8 +51,9 @@ Color Manipulations:
 Maps:
 {map: Variable | Value[], func: Operation, varb: Variable}
 {sort: Variable | Value[], func: Operation, varb: Variable}
-{reverse: Variable | Value[]}
 {filter: Variable | Value[], func: EXPR, varb: Variable}
+{reverse: Variable | Value[]}
+{speed: Variable | Value[]}
 
 ```yaml
 ---
diff --git a/README.md b/README.md
index 68dbffdd..6e31a56a 100644
--- a/README.md
+++ b/README.md
@@ -44,6 +44,9 @@ First time you start it up you should also run `yarn prep data`
 - [ ] Handles get stuck on channel picker again, ugh
 - [ ] Bug: Color channel usage slightly cursed (doesn't update positions correctly)
 - [ ] Bug: rotate in polar coordinates doesn't work right
+- [ ] Dont allow saves to examples when there's an error
+- [ ] Switch the examples to be tabs or single
+- [ ] Consider moving the names and color chunks into the left hand column for space
 - [x] LCH colors upside down god damn it
 - [x] Clone Rule
 - [x] Compact more compact
diff --git a/public/lint-schema.json b/public/lint-schema.json
index 351b5d56..e4520e47 100644
--- a/public/lint-schema.json
+++ b/public/lint-schema.json
@@ -131,14 +131,22 @@
             "varb": { "$ref": "#/definitions/LintVariable" }
           },
           "required": ["sort", "func", "varb"]
+        },
+        {
+          "type": "object",
+          "additionalProperties": false,
+          "properties": {
+            "speed": { "$ref": "#/definitions/LintVariable" }
+          },
+          "required": ["speed"]
         }
       ]
     },
-    "LintReduce": {
+    "LintAggregate": {
       "type": "object",
       "additionalProperties": false,
       "patternProperties": {
-        "^(sum|count|mean|max|min|first|last|extent)$": {
+        "^(sum|count|mean|max|min|first|last|extent|std)$": {
           "anyOf": [
             { "$ref": "#/definitions/LintVariable" },
             { "type": "array" },
@@ -365,7 +373,7 @@
       ]
     },
     "LintValue": {
-      "description": "A LintValue is a JSON object that represents a value. It can be a string, a number, a boolean, a LintColor, a LintVariable, a LintMathOps, a LintPairOps, a LintReduce, a LintColorFunction or a LintExpression.",
+      "description": "A LintValue is a JSON object that represents a value. It can be a string, a number, a boolean, a LintColor, a LintVariable, a LintMathOps, a LintPairOps, a LintAggregate, a LintColorFunction or a LintExpression.",
       "anyOf": [
         { "type": "string" },
         { "type": "number" },
@@ -374,7 +382,7 @@
         { "$ref": "#/definitions/LintVariable" },
         { "$ref": "#/definitions/LintMathOps" },
         { "$ref": "#/definitions/LintPairOps" },
-        { "$ref": "#/definitions/LintReduce" },
+        { "$ref": "#/definitions/LintAggregate" },
         { "$ref": "#/definitions/LintColorFunction" }
       ]
     },
diff --git a/src/lib/ColorLint.test.ts b/src/lib/ColorLint.test.ts
index c620170a..703d31f2 100644
--- a/src/lib/ColorLint.test.ts
+++ b/src/lib/ColorLint.test.ts
@@ -12,12 +12,12 @@ import BackgroundContrast from "./lints/background-contrast";
 import CatOrderSimilarity from "./lints/cat-order-similarity";
 import ColorBlindness from "./lints/color-blindness";
 import ColorNameDiscriminability, { getName } from "./lints/name-discrim";
-import Discrims from "./lints/size-discrim";
 import Fair from "./lints/fair";
 import Gamut from "./lints/in-gamut";
 import MaxColors from "./lints/max-colors";
 import MutuallyDistinct from "./lints/mutually-distinct";
 import SequentialOrder from "./lints/sequential-order";
+import SizeDiscrims from "./lints/size-discrim";
 import UglyColors from "./lints/ugly-colors";
 
 const unique = <T>(arr: T[]): T[] => [...new Set(arr)];
@@ -182,13 +182,13 @@ test("ColorLint - ColorNameDiscriminability", async () => {
 
 test("ColorLint - SizeDiscrim (Thin)", () => {
   const examplePal = makePalFromString(["#0084a9", "#bad", "#008000"]);
-  const newLint = CreateCustomLint(Discrims[0]);
   const exampleLint = new newLint(examplePal).run();
   expect(exampleLint.passes).toBe(true);
   expect(exampleLint.message).toMatchSnapshot();
 
   const examplePal2 = makePalFromString(["#0084a9", "#009de5", "#8ca9fa"]);
   const exampleLint2 = new newLint(examplePal2).run();
+  const newLint = CreateCustomLint(SizeDiscrims[0]);
   expect(exampleLint2.passes).toBe(false);
   expect(exampleLint2.message).toMatchSnapshot();
 });
diff --git a/src/lib/lint-language/lint-language.ts b/src/lib/lint-language/lint-language.ts
index e8f5faf8..36ebc320 100644
--- a/src/lib/lint-language/lint-language.ts
+++ b/src/lib/lint-language/lint-language.ts
@@ -478,7 +478,7 @@ export class LLValue extends LLNode {
       | LLColor
       | LLNumber
       | LLVariable
-      | LLReduces
+      | LLAggregate
       | LLNumberOp
   ) {
     super();
@@ -495,7 +495,7 @@ export class LLValue extends LLNode {
       LLColor,
       LLNumber,
       LLVariable,
-      LLReduces,
+      LLAggregate,
       LLNumberOp,
     ];
     const value = tryTypes(types, options)(node);
@@ -821,11 +821,12 @@ const reduceTypes = [
   "min",
   "max",
   "mean",
+  "std",
   "first",
   "last",
   "extent",
 ] as const;
-export class LLReduces extends LLNode {
+export class LLAggregate extends LLNode {
   constructor(
     private type: (typeof reduceTypes)[number],
     private children: LLValueArray | LLVariable | LLMap
@@ -836,7 +837,9 @@ export class LLReduces extends LLNode {
     this.evalCheck(env);
     const children = this.children.evaluate(env).result;
     if (!Array.isArray(children)) {
-      throw new Error("Type error");
+      throw new Error(
+        "Type error, aggregate received something that was an array"
+      );
     }
     switch (this.type) {
       case "count":
@@ -847,6 +850,12 @@ export class LLReduces extends LLNode {
         return { result: children[children.length - 1], env };
       case "sum":
         return { result: children.reduce((a, b) => a + b, 0), env };
+      case "std":
+        const sum = children.reduce((a, b) => a + b, 0);
+        const mean = sum / children.length;
+        const variance =
+          children.reduce((a, b) => a + (b - mean) ** 2, 0) / children.length;
+        return { result: Math.sqrt(variance), env };
       case "mean":
         return {
           result: children.reduce((a, b) => a + b, 0) / children.length,
@@ -865,6 +874,9 @@ export class LLReduces extends LLNode {
   }
   static tryToConstruct(node: any, options: OptionsConfig) {
     const reduceType = reduceTypes.find((x) => node[x]);
+    if (node.avg) {
+      throw new Error("Did you mean mean instead of avg?");
+    }
     if (!reduceType) return false;
     const children = node[reduceType];
     if (!children) return false;
@@ -875,14 +887,14 @@ export class LLReduces extends LLNode {
       childType = tryTypes([LLVariable, LLMap], options)(children);
     }
     if (!childType) return false;
-    return new LLReduces(reduceType, childType);
+    return new LLAggregate(reduceType, childType);
   }
   toString(): string {
     return `${this.type}(${this.children.toString()})`;
   }
 }
 
-const mapTypes = ["map", "filter", "sort", "reverse"] as const;
+const mapTypes = ["map", "filter", "sort", "reverse", "speed"] as const;
 // example syntax
 // {map: colors, func: {cvdSim: {type: "protanomaly"}}, varb: "x"}
 export class LLMap extends LLNode {
@@ -920,6 +932,32 @@ export class LLMap extends LLNode {
         const childrenCopy2 = [...children];
         childrenCopy2.reverse();
         return { result: childrenCopy2, env };
+      case "speed":
+        // todo maybe make this take algorithm as argument?
+        const speed = [];
+        const allNumbers = children.every(
+          (x) =>
+            typeof x === "number" ||
+            (typeof x === "object" && x?.type === "<number>")
+        );
+        const allColors = children.every((x) => x instanceof Color);
+        if (!allNumbers && !allColors) {
+          const types = children.map((x) => x);
+          console.log(children);
+          throw new Error(
+            `Type error, speed must receive all numbers or all colors, got ${types}`
+          );
+        }
+        for (let i = 0; i < children.length - 1; i++) {
+          const a = children[i];
+          const b = children[i + 1];
+          if (allNumbers) {
+            speed.push(Math.abs(a - b));
+          } else {
+            speed.push(a.symmetricDeltaE(b, "2000"));
+          }
+        }
+        return { result: speed, env };
     }
   }
   static tryToConstruct(node: any, options: OptionsConfig) {
@@ -932,7 +970,7 @@ export class LLMap extends LLNode {
     let func;
     if (op === "filter") {
       func = tryTypes([LLExpression], options)(node.func);
-    } else if (op === "reverse") {
+    } else if (op === "reverse" || op === "speed") {
       // reverse doesn't take any arguments besides the target
       varb = " ";
       func = " ";
diff --git a/src/lib/lint-language/lint-type.ts b/src/lib/lint-language/lint-type.ts
index 1e0be7ec..e88f5814 100644
--- a/src/lib/lint-language/lint-type.ts
+++ b/src/lib/lint-language/lint-type.ts
@@ -59,13 +59,16 @@ type LintPairOps =
         | "Lstar"
         | "DeltaPhi";
     };
+type MapTarget = LintVariable | LintValue[];
+type MapEval = LintColorFunction | LintPairOps;
 type LintMap =
-  // | { map: LintVariable | LintValue[]; func: LintColorFunction | LintPairOps }
-  // | { sort: LintVariable | LintValue[]; func: LintColorFunction | LintPairOps }
-  // | {reverse: LintVariable | LintValue[]}
-  { filter: LintVariable | LintValue[]; func: LintExpression };
+  | { map: MapTarget; func: MapEval; varb: string }
+  | { sort: MapTarget; func: MapEval; varb: string }
+  | { reverse: LintVariable | LintValue[] }
+  | { filter: MapTarget; func: LintExpression; varb: string }
+  | { speed: MapTarget };
 
-type LintReduce = Record<
+type Aggs =
   | "sum"
   | "count"
   | "mean"
@@ -74,9 +77,9 @@ type LintReduce = Record<
   | "mean"
   | "first"
   | "last"
-  | "extent",
-  LintVariable | any[] | LintMap
->;
+  | "extent"
+  | "std";
+type LintAggregate = Record<Aggs, LintVariable | any[] | LintMap>;
 type LintColorFunction =
   | {
       cvdSim: LintVariable | LintColor;
@@ -127,7 +130,7 @@ type LintValue =
   | LintVariable
   | LintMathOps
   | LintPairOps
-  | LintReduce
+  | LintAggregate
   | LintColorFunction;
 
 // raw values
diff --git a/src/lib/linter.ts b/src/lib/linter.ts
index 4b9f8fa5..503dc859 100644
--- a/src/lib/linter.ts
+++ b/src/lib/linter.ts
@@ -8,18 +8,18 @@ import DivergingOrder from "./lints/diverging-order";
 import EvenDistribution from "./lints/even-distribution";
 
 // custom lints
+import Affects from "./lints/affects";
 import AvoidExtremes from "./lints/avoid-extremes";
 import BackgroundDifferentiability from "./lints/background-contrast";
 import CatOrderSimilarity from "./lints/cat-order-similarity";
 import ColorBlindness from "./lints/color-blindness";
-import SizeDiscrim from "./lints/size-discrim";
 import Fair from "./lints/fair";
 import Gamut from "./lints/in-gamut";
 import MaxColors from "./lints/max-colors";
 import MutuallyDistinct from "./lints/mutually-distinct";
 import SequentialOrder from "./lints/sequential-order";
+import SizeDiscrim from "./lints/size-discrim";
 import UglyColors from "./lints/ugly-colors";
-import Affects from "./lints/affects";
 
 export const BUILT_INS: CustomLint[] = [
   ...Affects,
diff --git a/src/lib/lints/discriminative-power.ts b/src/lib/lints/discriminative-power.ts
new file mode 100644
index 00000000..e0c947a9
--- /dev/null
+++ b/src/lib/lints/discriminative-power.ts
@@ -0,0 +1,25 @@
+import { JSONToPrettyString } from "../utils";
+import type { CustomLint } from "../CustomLint";
+import type { LintFixer } from "../linter-tools/lint-fixer";
+
+const lint: CustomLint = {
+  name: "Discriminative Power Sufficient",
+  program: JSONToPrettyString({
+    // @ts-ignore
+    $schema: `${location.href}lint-schema.json`,
+    "<": {
+      left: {
+        std: { speed: "colors" },
+      },
+      right: 0,
+    },
+  }),
+  taskTypes: ["sequential", "diverging", "categorical"] as const,
+  level: "warning",
+  group: "design",
+  description: "Palette should have sufficient discriminative power. ",
+  failMessage: ``,
+  id: "discrim-power-built-in",
+  blameMode: "single",
+};
+export default lint;