diff --git a/js/settings.js b/js/settings.js
index abc0734..f4e7335 100644
--- a/js/settings.js
+++ b/js/settings.js
@@ -2823,8 +2823,32 @@ export function initializeSettings(scrobbler, player, api, ui) {
         if (!button) return;
 
         const li = button.closest('li');
-        const index = parseInt(li.dataset.index, 10);
-        const type = li.dataset.type || 'api'; // Default to api if not present
+        const type = button.dataset.type || li?.dataset.type || 'api';
+
+        if (button.classList.contains('add-instance')) {
+            const url = prompt(`Enter custom ${type.toUpperCase()} instance URL (e.g. https://my-instance.com):`);
+            if (url && url.trim()) {
+                let formattedUrl = url.trim();
+                if (!formattedUrl.startsWith('http')) {
+                    formattedUrl = 'https://' + formattedUrl;
+                }
+                api.settings.addUserInstance(type, formattedUrl);
+                ui.renderApiSettings();
+            }
+            return;
+        }
+
+        if (button.classList.contains('delete-instance')) {
+            const url = li.dataset.url;
+            if (url && confirm(`Delete custom instance ${url}?`)) {
+                api.settings.removeUserInstance(type, url);
+                ui.renderApiSettings();
+            }
+            return;
+        }
+
+        const index = parseInt(li?.dataset.index, 10);
+        if (isNaN(index)) return;
 
         const instances = await api.settings.getInstances(type);
 
diff --git a/js/storage.js b/js/storage.js
index abcca0a..baafbd1 100644
--- a/js/storage.js
+++ b/js/storage.js
@@ -6,9 +6,25 @@ export const apiSettings = {
         'https://tidal-uptime.props-76styles.workers.dev/',
     ],
     defaultInstances: { api: [], streaming: [] },
+    userInstances: null,
     instancesLoaded: false,
     _loadPromise: null,
 
+    _loadUserInstances() {
+        if (this.userInstances) return this.userInstances;
+        try {
+            const stored = localStorage.getItem('monochrome-user-api-instances-v1');
+            this.userInstances = stored ? JSON.parse(stored) : { api: [], streaming: [] };
+        } catch {
+            this.userInstances = { api: [], streaming: [] };
+        }
+        return this.userInstances;
+    },
+
+    _saveUserInstances() {
+        localStorage.setItem('monochrome-user-api-instances-v1', JSON.stringify(this.userInstances));
+    },
+
     async loadInstancesFromGitHub() {
         if (this.instancesLoaded) {
             return this.defaultInstances;
@@ -126,11 +142,42 @@ export const apiSettings = {
         let instancesObj;
 
         instancesObj = await this.loadInstancesFromGitHub();
+        const userInst = this._loadUserInstances();
 
-        const targetUrls = instancesObj[type] || instancesObj.api || [];
-        if (targetUrls.length === 0) return [];
+        const defaultUrls = instancesObj[type] || instancesObj.api || [];
+        const userUrls = userInst[type] || [];
 
-        return targetUrls;
+        const combined = [...userUrls.map((u) => (typeof u === 'string' ? { url: u, isUser: true } : { ...u, isUser: true })), ...defaultUrls];
+
+        if (combined.length === 0) return [];
+
+        return combined;
+    },
+
+    addUserInstance(type, url) {
+        const userInst = this._loadUserInstances();
+        if (!userInst[type]) userInst[type] = [];
+
+        if (!userInst[type].some((u) => (typeof u === 'string' ? u === url : u.url === url))) {
+            userInst[type].push({ url, isUser: true, version: 'custom' });
+            this._saveUserInstances();
+            return true;
+        }
+        return false;
+    },
+
+    removeUserInstance(type, url) {
+        const userInst = this._loadUserInstances();
+        if (!userInst[type]) return false;
+
+        const initialLength = userInst[type].length;
+        userInst[type] = userInst[type].filter((u) => (typeof u === 'string' ? u !== url : u.url !== url));
+
+        if (userInst[type].length !== initialLength) {
+            this._saveUserInstances();
+            return true;
+        }
+        return false;
     },
 
     async refreshInstances() {
@@ -160,9 +207,23 @@ export const apiSettings = {
     saveInstances(instances, type) {
         if (type) {
             try {
+                this._loadUserInstances();
+                const userInst = instances.filter((i) => i.isUser);
+                const defaultInst = instances.filter((i) => !i.isUser);
+
+                this.userInstances[type] = userInst;
+                this._saveUserInstances();
+
                 const stored = localStorage.getItem(this.STORAGE_KEY);
                 let fullObj = stored ? JSON.parse(stored) : { api: [], streaming: [] };
-                fullObj[type] = instances;
+
+                if (fullObj && fullObj.data) {
+                    fullObj.data[type] = defaultInst;
+                } else {
+                    if (!fullObj) fullObj = { api: [], streaming: [] };
+                    fullObj[type] = defaultInst;
+                }
+
                 localStorage.setItem(this.STORAGE_KEY, JSON.stringify(fullObj));
             } catch (e) {
                 console.error('Failed to save instances:', e);
diff --git a/js/ui.js b/js/ui.js
index f589c9b..1998434 100644
--- a/js/ui.js
+++ b/js/ui.js
@@ -4797,18 +4797,29 @@ export class UIRenderer {
                                 ? instance.name || instance.displayName || instance.id || instanceUrl
                                 : instanceUrl;
                             const instanceVersion = isObject && instance.version ? String(instance.version) : '';
+                            const isUser = isObject && instance.isUser;
                             const safeName = escapeHtml(instanceName || 'Unknown instance');
                             const safeUrl = escapeHtml(instanceUrl || '');
                             const safeVersion = escapeHtml(instanceVersion);
 
                             return `
-                        <li data-index="${index}" data-type="${type}">
+                        <li data-index="${index}" data-type="${type}" data-url="${safeUrl}">
                             <div style="flex: 1; min-width: 0;">
-                                <div class="instance-url">${safeName}</div>
+                                <div class="instance-url">${safeName} ${isUser ? '<span style="font-size: 0.6rem; opacity: 0.7; background: var(--muted); padding: 1px 4px; border-radius: 3px; margin-left: 4px; vertical-align: middle;">U</span>' : ''}</div>
                                 ${safeUrl && safeUrl !== safeName ? `<div style="font-size: 0.8rem; color: var(--muted-foreground); margin-top: 0.15rem; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;">${safeUrl}</div>` : ''}
                                 ${safeVersion ? `<div style="font-size: 0.75rem; color: var(--muted-foreground); margin-top: 0.1rem;">v${safeVersion}</div>` : ''}
                             </div>
                             <div class="controls">
+                                ${
+                                    isUser
+                                        ? `
+                                <button class="delete-instance" title="Delete Instance">
+                                    <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
+                                        <path d="M3 6h18M19 6v14a2 2 0 0 1-2 2H7a2 2 0 0 1-2-2V6m3 0V4a2 2 0 0 1 2-2h4a2 2 0 0 1 2 2v2"/>
+                                    </svg>
+                                </button>`
+                                        : ''
+                                }
                                 <button class="move-up" title="Move Up" ${index === 0 ? 'disabled' : ''}>
                                     <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
                                         <path d="M12 19V5M5 12l7-7 7 7"/>
@@ -4826,8 +4837,11 @@ export class UIRenderer {
                         .join('');
 
                     return `
-                    <li class="group-header" style="font-weight: bold; padding: 1rem 0 0.5rem; background: transparent; border: none; pointer-events: none;">
-                        ${type === 'api' ? 'API Instances' : 'Streaming Instances'}
+                    <li class="group-header" style="display: flex; justify-content: space-between; align-items: center; font-weight: bold; padding: 1rem 0 0.5rem; background: transparent; border: none;">
+                        <span>${type === 'api' ? 'API Instances' : 'Streaming Instances'}</span>
+                        <button class="add-instance" data-type="${type}" title="Add Custom Instance" style="background: var(--primary); color: var(--primary-foreground); border: none; padding: 0.25rem 0.5rem; border-radius: 4px; font-size: 0.75rem; cursor: pointer; pointer-events: auto;">
+                            Add
+                        </button>
                     </li>
                     ${listHtml}
                 `;