diff --git a/src/UI/InputElement/Helpers/SlopeInput.svelte b/src/UI/InputElement/Helpers/SlopeInput.svelte
index e69de29bb2..9ae74af514 100644
--- a/src/UI/InputElement/Helpers/SlopeInput.svelte
+++ b/src/UI/InputElement/Helpers/SlopeInput.svelte
@@ -0,0 +1,113 @@
+<script lang="ts">
+  import { UIEventSource } from "../../../Logic/UIEventSource"
+  import { ArrowUpIcon } from "@babeard/svelte-heroicons/mini"
+  import Translations from "../../i18n/Translations"
+  import Tr from "../../Base/Tr.svelte"
+
+  export let value: UIEventSource<string>
+  export let mode: "degrees" | "percentage" = "percentage"
+
+  export let preview: UIEventSource<string> = new UIEventSource<string>(undefined)
+
+  let previewMode: "degrees" | "percentage" = mode
+
+  function oppMode(m: "degrees" | "percentage"): "percentage" | "degrees" {
+    if (m === "degrees") {
+      return "percentage"
+    }
+    return "degrees"
+  }
+
+  function degreesToPercentage(beta: number): string {
+    const perc = Math.tan(beta * Math.PI / 180) * 100
+    const rounded = Math.round(perc / 5) * 5
+    return rounded + "%"
+  }
+
+  export let safetyMargin: number = 10
+  if (safetyMargin < 5) {
+    throw "Safetymargin should be at least 5, it is " + JSON.stringify(safetyMargin)
+  }
+
+  let alpha = new UIEventSource<number>(undefined)
+  let beta = new UIEventSource<number>(undefined)
+  let gamma = new UIEventSource<number>(45)
+  let abs = new UIEventSource<number>(undefined)
+
+  let gotMeasurement = false
+  let arrowDirection: number = undefined
+
+
+  function handleOrientation(event) {
+    gotMeasurement = true
+    // IF the phone is lying flat, then:
+    // alpha is the compass direction (but not absolute)
+    // beta is tilt if you would lift the phone towards you
+    // gamma is rotation if you rotate the phone along the long axis
+
+    alpha.setData(Math.floor(event.alpha))
+    beta.setData(Math.floor(event.beta))
+    gamma.setData(Math.floor(event.gamma))
+    abs.setData((event.absolute))
+    if (beta.data < 0) {
+      arrowDirection = gamma.data + 180
+    } else {
+      arrowDirection = -gamma.data
+    }
+  }
+
+  window.addEventListener("deviceorientation", handleOrientation)
+
+  beta.map(beta => {
+    if (-safetyMargin < arrowDirection && arrowDirection < safetyMargin) {
+      if (mode === "degrees") {
+        value.setData("" + beta + "°")
+      } else {
+        value.setData(degreesToPercentage(beta))
+      }
+
+      if (previewMode === "degrees") {
+        preview.setData("" + beta + "°")
+      } else {
+        preview.setData(degreesToPercentage(beta))
+      }
+
+    } else {
+      value.setData(undefined)
+    }
+  }, [beta])
+
+</script>
+{#if gotMeasurement}
+  <div class="flex flex-col m-2">
+    <div class="flex w-full">
+
+      <div class="shrink-0 relative w-32 h-32 p-0 m-0 overflow-hidden"
+           style="border-radius: 9999px; background: greenyellow">
+        <div class="absolute top-0 left-0 w-16 h-16 interactive"
+             style={`transform: rotate( ${-safetyMargin}deg ); transform-origin: 100% 100%`} />
+        <div class="absolute top-0 left-0 w-16 h-16 interactive"
+             style={`transform: rotate( ${90+safetyMargin}deg ); transform-origin: 100% 100%`} />
+        <div class="absolute top-0 mt-8 left-0 w-32 h-32 interactive" />
+        <div class="absolute w-30 h-30 top-0 left-0 rounded-full">
+          <ArrowUpIcon class="" style={`transform: rotate( ${arrowDirection}deg )`} />
+        </div>
+      </div>
+
+      <div class="font-bold w-full flex justify-center items-center">
+        {#if $value}
+          <div class="text-5xl" on:click={() => {previewMode = oppMode(previewMode)}}>
+            {$preview}
+          </div>
+        {:else}
+          <Tr cls="alert" t={Translations.t.validation.slope.inputIncorrect} />
+        {/if}
+      </div>
+
+    </div>
+
+    <div>
+      <Tr t={Translations.t.validation.slope.inputExplanation} />
+    </div>
+  </div>
+{/if}
diff --git a/src/UI/InputElement/Validators.ts b/src/UI/InputElement/Validators.ts
index 62be469a45..4fa0eabafa 100644
--- a/src/UI/InputElement/Validators.ts
+++ b/src/UI/InputElement/Validators.ts
@@ -26,6 +26,7 @@ import FediverseValidator from "./Validators/FediverseValidator"
 import IconValidator from "./Validators/IconValidator"
 import TagValidator from "./Validators/TagValidator"
 import IdValidator from "./Validators/IdValidator"
+import SlopeValidator from "./Validators/SlopeValidator"
 
 export type ValidatorType = (typeof Validators.availableTypes)[number]
 
@@ -56,6 +57,7 @@ export default class Validators {
         "tag",
         "fediverse",
         "id",
+        "slope",
     ] as const
 
     public static readonly AllValidators: ReadonlyArray<Validator> = [
@@ -83,6 +85,7 @@ export default class Validators {
         new IconValidator(),
         new FediverseValidator(),
         new IdValidator(),
+        new SlopeValidator(),
     ]
 
     private static _byType = Validators._byTypeConstructor()