diff --git a/api/app.py b/api/app.py
index de2807b..e95d251 100755
--- a/api/app.py
+++ b/api/app.py
@@ -10,6 +10,7 @@ import uvicorn
 import redis
 from subprocess import Popen, PIPE
 
+from fastapi.params import Form
 from starlette.responses import Response
 
 app = FastAPI()
@@ -21,15 +22,79 @@ def read_root():
     return {"Hello": "World"}
 
 
-HOUR = 3600
-DAY = HOUR * 24
-FLAMEGRAPH_TTL = DAY * 7
+TTL = 60 * 60
 
-@app.get("/flame_graph/{key}")
-def flame_graph_get(key: str):
 
-    data = rdb.get("toolbox:FlameGraph:" + key)
-    return Response(content=data, media_type="image/svg+xml")
+@app.get("/data/{key}")
+def flame_graph_get(key: str, type: str):
+    data = rdb.get("toolbox:data:" + key)
+    return Response(content=data, media_type=type)
+
+
+class SpectrographRequest:
+    x: int
+    y: int
+    z: int
+    label: str
+    window: str
+
+    def __init__(self, x, y, z, label, window, type):
+        self.x = x
+        self.y = y
+        self.z = z
+        self.label = label
+        self.window = window
+        self.type = type
+
+    def valid(self):
+        if self.x < 100 or self.x > 200000:
+            return False
+
+        if self.y < 100 or self.y > 10000:
+            return False
+
+        if self.z < 20 or self.z > 180:
+            return False
+
+        if self.window not in ("Hann", "Hamming", "Bartlett", "Rectangular", "Kaiser", "Dolph"):
+            return False
+        return True
+
+
+@app.post("/spectrograph")
+def spectrograph(file: bytes = File(...), x: int = Form(...), y: int = Form(...), z: int = Form(...), label=Form(...),
+                 window=Form(...), type=Form(...)):
+    key = str(uuid.uuid4())
+
+    req = SpectrographRequest(x, y, z, label, window, type)
+    if not req.valid():
+        return {
+            "err": "Invalid request"
+        }
+
+    p = Popen(
+        ["sox",
+         "-t", type,
+         "-",
+         "-n", "remix", "1", "spectrogram",
+         "-t", label,
+         "-x", str(x), "-y", str(y), "-z", str(z),
+         "-w", window,
+         "-o", "-"],
+        cwd="./FlameGraph",
+        stdin=PIPE, stdout=PIPE, stderr=PIPE,
+    )
+
+    p.stdin.write(file)
+    p.stdin.close()
+
+    out = p.stdout.read()
+    rdb.set("toolbox:data:" + key, out, ex=TTL)
+
+    return {
+        "key": key
+    }
+
 
 @app.post("/flame_graph")
 def flame_graph(file: bytes = File(...), width: int = 1200):
@@ -64,7 +129,7 @@ def flame_graph(file: bytes = File(...), width: int = 1200):
         p3.stdin.close()
 
         out = p3.stdout.read()
-        rdb.set("toolbox:FlameGraph:" + key, out, ex=FLAMEGRAPH_TTL)
+        rdb.set("toolbox:data:" + key, out, ex=TTL)
 
         return {
             "key": key,
diff --git a/toolbox-web/src/assets/Spectrograph.png b/toolbox-web/src/assets/Spectrograph.png
new file mode 100644
index 0000000..88a3675
Binary files /dev/null and b/toolbox-web/src/assets/Spectrograph.png differ
diff --git a/toolbox-web/src/components/FlameGraph.vue b/toolbox-web/src/components/FlameGraph.vue
index 5cfa94b..6d03702 100644
--- a/toolbox-web/src/components/FlameGraph.vue
+++ b/toolbox-web/src/components/FlameGraph.vue
@@ -30,7 +30,7 @@ export default class FlameGraph extends Vue {
   public apiUrl = API_URL
 
   getGraphUrl() {
-    return `${API_URL}/flame_graph/${this.key}`
+    return `${API_URL}/data/${this.key}?type=image/svg%2Bxml`
   }
 
   onUpload() {
diff --git a/toolbox-web/src/components/Home.vue b/toolbox-web/src/components/Home.vue
index d19130c..e7bd66e 100644
--- a/toolbox-web/src/components/Home.vue
+++ b/toolbox-web/src/components/Home.vue
@@ -1,13 +1,17 @@
 <template>
-  <div>
+  <div class="px-2">
     <v-row>
-      <v-col>
-        <v-card max-width="344" to="/tool/FlameGraph">
+        <v-card class="mx-2" max-width="344" to="/tool/FlameGraph">
           <v-img :src="require('@/assets/FlameGraph.png')" height="200px"></v-img>
           <v-card-title>FlameGraph</v-card-title>
           <v-card-subtitle><i>perf</i> profiling data visualization</v-card-subtitle>
         </v-card>
-      </v-col>
+
+        <v-card class="mx-2" max-width="344" to="/tool/Spectrograph">
+          <v-img :src="require('@/assets/Spectrograph.png')" height="200px"></v-img>
+          <v-card-title>Spectrograph</v-card-title>
+          <v-card-subtitle>Generate spectrograph of audio files with <i>SoX</i></v-card-subtitle>
+        </v-card>
     </v-row>
   </div>
 </template>
diff --git a/toolbox-web/src/components/Spectrograph.vue b/toolbox-web/src/components/Spectrograph.vue
new file mode 100644
index 0000000..1ac381f
--- /dev/null
+++ b/toolbox-web/src/components/Spectrograph.vue
@@ -0,0 +1,90 @@
+<template>
+  <v-container>
+
+    <v-form v-model="valid" id="spectrograph-form">
+      <v-row>
+        <v-col>
+          <v-text-field :rules="[x => x < 20000 && x > 100]" label="Width" type="number" value="5000"
+                        name="x"></v-text-field>
+        </v-col>
+        <v-col>
+          <v-text-field :rules="[y => y < 20000 && y > 100]" label="Height" type="number" value="1100"
+                        name="y"></v-text-field>
+        </v-col>
+        <v-col>
+          <v-text-field :rules="[z => z < 120 && z > 20]" label="Z" type="number" value="100"
+                        name="z"></v-text-field>
+        </v-col>
+      </v-row>
+      <v-text-field label="Label" name="label"></v-text-field>
+      <v-select label="Window" :items="windows" value="Kaiser" name="window"></v-select>
+
+      <v-file-input name="file" :disabled="!valid || loading" :loading="loading" label="Audio file" id="spectrograph"
+                    @change="onUpload()"></v-file-input>
+    </v-form>
+
+    <a v-if="key" :href="getImageUrl()" target="_blank"><img width="100%" type="image/png" :src="getImageUrl()" id="img"></a>
+
+  </v-container>
+</template>
+
+<script lang="ts">
+import Vue from 'vue'
+import {Component} from 'vue-property-decorator'
+import {toolByName} from '@/tools'
+import axios from 'axios'
+import {API_URL} from '@/config';
+
+@Component
+export default class Spectrograph extends Vue {
+  public tool = toolByName('Spectrograph')
+  public key: string | null = null
+  public loading = false
+  public apiUrl = API_URL
+
+  public valid = true
+
+  public windows = [
+    "Hann",
+    "Hamming",
+    "Bartlett",
+    "Rectangular",
+    "Kaiser",
+    "Dolph"
+  ]
+
+  getImageUrl() {
+    return `${API_URL}/data/${this.key}?type=image/png`
+  }
+
+  onUpload() {
+    this.loading = true;
+    const formData = new FormData(document.getElementById("spectrograph-form") as any);
+    const input = document.getElementById("spectrograph") as any;
+
+    if (!formData.get("label")) {
+      formData.set("label", " ")
+    }
+
+    formData.set("type", input.value.split(".").slice(-1)[0])
+
+    axios.post(API_URL + '/spectrograph', formData, {
+      headers: {
+        'Content-Type': 'multipart/form-data'
+      }
+    }).then(resp => {
+      const result = resp.data
+
+      this.key = result.key
+      this.loading = false;
+    })
+  }
+}
+</script>
+
+<style>
+.img-zoom-result {
+  width: 325px;
+  height: 325px;
+}
+</style>
diff --git a/toolbox-web/src/router/index.ts b/toolbox-web/src/router/index.ts
index 0dce81b..bb65871 100644
--- a/toolbox-web/src/router/index.ts
+++ b/toolbox-web/src/router/index.ts
@@ -2,12 +2,14 @@ import Vue from 'vue'
 import VueRouter, {RouteConfig} from 'vue-router'
 import Home from '../components/Home.vue'
 import FlameGraph from '@/components/FlameGraph.vue'
+import Spectrograph from '@/components/Spectrograph.vue';
 
 Vue.use(VueRouter)
 
 const routes: Array<RouteConfig> = [
   {path: '/', component: Home},
-  {path: '/tool/FlameGraph', component: FlameGraph}
+  {path: '/tool/FlameGraph', component: FlameGraph},
+  {path: '/tool/Spectrograph', component: Spectrograph}
 ]
 
 const router = new VueRouter({
diff --git a/toolbox-web/src/tools.ts b/toolbox-web/src/tools.ts
index a4218c2..47f5606 100644
--- a/toolbox-web/src/tools.ts
+++ b/toolbox-web/src/tools.ts
@@ -1,7 +1,8 @@
 import {Tool} from "@/models";
 
 export const tools: Tool[] = [
-  {name: "FlameGraph", icon: "mdi-bug"}
+  {name: "FlameGraph", icon: "mdi-bug"},
+  {name: "Spectrograph", icon: "mdi-music"}
 ]
 
 export const toolByName = (name: string) => {
diff --git a/toolbox-web/tsconfig.json b/toolbox-web/tsconfig.json
index a489b8f..d345dff 100644
--- a/toolbox-web/tsconfig.json
+++ b/toolbox-web/tsconfig.json
@@ -9,6 +9,7 @@
     "experimentalDecorators": true,
     "esModuleInterop": true,
     "allowSyntheticDefaultImports": true,
+    "strictNullChecks": false,
     "sourceMap": true,
     "baseUrl": ".",
     "types": [