diff --git a/CLAUDE.md b/CLAUDE.md
index 66576b3d..41407a44 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -35,7 +35,7 @@ When user says "COM":
 1. Increment version in BOTH `package.json` AND `CLAUDE.md` (verify they match with `grep version package.json && grep Version CLAUDE.md`)
 2. Run: `git add -A && git commit -m "chore: bump version to X.XXXX" && git push && npm run build && systemctl --user restart claudeman-web`
 
-**Version**: 0.1524 (must match `package.json` for npm publish)
+**Version**: 0.1525 (must match `package.json` for npm publish)
 
 ## Project Overview
 
diff --git a/package.json b/package.json
index 25e871df..a97b33fa 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "claudeman",
-  "version": "0.1524",
+  "version": "0.1525",
   "description": "The missing control plane for Claude Code - run 20 autonomous agents with real-time monitoring and session persistence",
   "type": "module",
   "main": "dist/index.js",
diff --git a/src/web/public/app.js b/src/web/public/app.js
index b0d9ad48..0e52a645 100644
--- a/src/web/public/app.js
+++ b/src/web/public/app.js
@@ -642,7 +642,7 @@ const KeyboardAccessoryBar = {
     this._confirmAction = action;
     if (btn) {
       btn.classList.add('confirming');
-      btn.dataset.origText = btn.textContent;
+      btn.dataset.origHtml = btn.innerHTML;
       btn.textContent = 'Tap again';
     }
     this._confirmTimer = setTimeout(() => this.clearConfirm(), 2000);
@@ -656,9 +656,9 @@ const KeyboardAccessoryBar = {
     }
     if (this._confirmAction && this.element) {
       const btn = this.element.querySelector(`[data-action="${this._confirmAction}"]`);
-      if (btn && btn.dataset.origText) {
-        btn.textContent = btn.dataset.origText;
-        delete btn.dataset.origText;
+      if (btn && btn.dataset.origHtml) {
+        btn.innerHTML = btn.dataset.origHtml;
+        delete btn.dataset.origHtml;
       }
       if (btn) btn.classList.remove('confirming');
     }
@@ -7438,6 +7438,41 @@ class ClaudemanApp {
     }
   }
 
+  /** Send Ctrl+C to the active session to stop the current operation.
+   *  Requires double-tap: first tap turns button amber, second tap within 2s sends Ctrl+C. */
+  stopClaude() {
+    if (!this.activeSessionId) return;
+    const btn = document.querySelector('.btn-toolbar.btn-stop');
+    if (!btn) return;
+
+    if (this._stopConfirmTimer) {
+      // Second tap — send Ctrl+C
+      clearTimeout(this._stopConfirmTimer);
+      this._stopConfirmTimer = null;
+      btn.innerHTML = btn.dataset.origHtml;
+      delete btn.dataset.origHtml;
+      btn.classList.remove('confirming');
+      fetch(`/api/sessions/${this.activeSessionId}/input`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({ input: '\x03' })
+      });
+    } else {
+      // First tap — enter confirm state
+      btn.dataset.origHtml = btn.innerHTML;
+      btn.textContent = 'Tap again';
+      btn.classList.add('confirming');
+      this._stopConfirmTimer = setTimeout(() => {
+        this._stopConfirmTimer = null;
+        if (btn.dataset.origHtml) {
+          btn.innerHTML = btn.dataset.origHtml;
+          delete btn.dataset.origHtml;
+        }
+        btn.classList.remove('confirming');
+      }, 2000);
+    }
+  }
+
   async runShell() {
     const caseName = document.getElementById('quickStartCase').value || 'testcase';
     const shellCount = Math.min(20, Math.max(1, parseInt(document.getElementById('shellCount').value) || 1));
diff --git a/src/web/public/index.html b/src/web/public/index.html
index feb52a27..7750c560 100644
--- a/src/web/public/index.html
+++ b/src/web/public/index.html
@@ -283,6 +283,9 @@
             <input type="number" id="tabCount" class="tab-count-input" value="1" min="1" max="20" readonly>
             <button class="tab-count-btn" onclick="app.incrementTabCount()">+</button>
           </div>
+          <button class="btn-toolbar btn-stop" onclick="app.stopClaude()" title="Stop (Ctrl+C)">
+            <svg width="14" height="14" viewBox="0 0 24 24" fill="currentColor"><rect x="4" y="4" width="16" height="16" rx="2"/></svg>
+          </button>
           <button class="btn-toolbar btn-shell" onclick="app.runShell()" title="Run Shell">
             Run Shell
           </button>
diff --git a/src/web/public/mobile.css b/src/web/public/mobile.css
index ac5066a0..a9200575 100644
--- a/src/web/public/mobile.css
+++ b/src/web/public/mobile.css
@@ -324,7 +324,7 @@ html.mobile-init .file-browser-panel {
     font-size: 0.85rem;
     cursor: pointer;
     flex-shrink: 0;
-    order: 4; /* Far right */
+    order: 5; /* Far right */
     position: relative;
   }
 
@@ -502,20 +502,20 @@ html.mobile-init .file-browser-panel {
     color: #fff;
   }
 
-  /* Primary action button - Run Claude */
+  /* Primary action button - Run Claude (matches arrow button blue) */
   .btn-toolbar.btn-claude {
     flex: 0 0 auto;
     padding: 0 0.75rem !important;
-    background: var(--bg-input);
-    border: 1px solid var(--border-light);
-    color: var(--text);
+    background: #1e3a5f;
+    border: 1px solid rgba(59, 130, 246, 0.3);
+    color: #93c5fd;
     font-weight: 500;
   }
 
   .btn-toolbar.btn-claude:hover,
   .btn-toolbar.btn-claude:active {
-    background: var(--bg-hover);
-    border-color: var(--accent);
+    background: #2563eb;
+    border-color: rgba(59, 130, 246, 0.5);
   }
 
   .btn-toolbar.btn-claude svg {
@@ -524,13 +524,28 @@ html.mobile-init .file-browser-panel {
     margin-right: 4px;
   }
 
+  /* Stop button - visible on mobile, icon-only */
+  .btn-toolbar.btn-stop {
+    display: flex !important;
+    flex: 0 0 auto;
+    padding: 0 8px !important;
+    min-width: unset;
+    order: 3; /* Left of Run Shell */
+  }
+
+  .btn-toolbar.btn-stop svg {
+    width: 10px;
+    height: 10px;
+    margin-right: 0;
+  }
+
   /* Secondary action - Run Shell - right side */
   .btn-toolbar.btn-shell {
     flex: 0 0 auto;
     background: transparent;
     border: 1px solid rgba(255, 255, 255, 0.2);
     color: #9ca3af;
-    order: 3; /* Right position */
+    order: 4; /* Right position */
   }
 
   .btn-toolbar.btn-shell:hover,
@@ -707,7 +722,6 @@ html.mobile-init .file-browser-panel {
   }
 
   .accessory-btn-dismiss {
-    margin-left: auto;
     padding: 8px 14px;
     background: #2a2a2a;
     border: 1.5px solid rgba(255, 255, 255, 0.25);
diff --git a/src/web/public/styles.css b/src/web/public/styles.css
index e28614fe..ce036347 100644
--- a/src/web/public/styles.css
+++ b/src/web/public/styles.css
@@ -1932,6 +1932,36 @@ body {
   color: #a8d8a8;
 }
 
+/* Stop button - hidden on desktop, shown on mobile */
+.btn-toolbar.btn-stop {
+  display: none;
+  background: linear-gradient(135deg, #5a1a1a 0%, #7f1d1d 100%);
+  border-color: #dc2626;
+  color: #fca5a5;
+  font-weight: 500;
+}
+
+.btn-toolbar.btn-stop:hover {
+  background: linear-gradient(135deg, #7f1d1d 0%, #991b1b 100%);
+  border-color: #ef4444;
+  box-shadow: 0 0 8px rgba(220, 38, 38, 0.4);
+  color: #fff;
+}
+
+.btn-toolbar.btn-stop svg {
+  flex-shrink: 0;
+  width: 12px;
+  height: 12px;
+}
+
+.btn-toolbar.btn-stop.confirming {
+  background: linear-gradient(135deg, #6b4f00 0%, #856200 100%);
+  border-color: #b8860b;
+  color: #ffd54f;
+  font-size: 0.65rem;
+  white-space: nowrap;
+}
+
 /* Mobile app settings gear - hidden on desktop, shown on mobile */
 .btn-settings-mobile {
   display: none;