diff --git a/README.md b/README.md
index e0fd0df..215ea5a 100644
--- a/README.md
+++ b/README.md
@@ -6,4 +6,5 @@ Installing:
 
 List of addons:
 
-- link - Using short links on whole hub
\ No newline at end of file
+- anoncaptcha - Adds a math captcha for anonymous commenters to prevent spam
+- link - Using short links on whole hub
diff --git a/anoncaptcha/README.md b/anoncaptcha/README.md
new file mode 100644
index 0000000..322d66a
--- /dev/null
+++ b/anoncaptcha/README.md
@@ -0,0 +1,12 @@
+AnonCaptcha Addon
+===============================
+
+Adds a math-based captcha for anonymous commenters to prevent spam.
+
+When enabled, anonymous visitors who wish to leave a comment must solve a simple addition problem (e.g. "What is 12 + 37?"). The captcha is generated server-side and signed with an HMAC token, so answers are never exposed in URLs or client-side code.
+
+Based on Zotlabs hook system.
+
+Adapted for Hubzilla 11
+
+Generated with Qwen 3.6 35B APEX Quality [VLM] v5090
diff --git a/anoncaptcha/anoncaptcha.php b/anoncaptcha/anoncaptcha.php
new file mode 100644
index 0000000..9e4d8b5
--- /dev/null
+++ b/anoncaptcha/anoncaptcha.php
@@ -0,0 +1,351 @@
+<?php
+/**
+ * Name: AnonCaptcha
+ * Description: Adds a math captcha for anonymous commenters to prevent spam
+ * Version: 0.9
+ * Author: ivan zlax <@zlax@ussr.win>
+ * Maintainer: ivan zlax <@zlax@ussr.win>
+ */
+
+define('ANONCAPTCHA_SECRET', 'heresecretsalt');
+define('ANONCAPTCHA_LIFE', 900);
+
+function anoncaptcha_load() {
+    register_hook('post_local_start', 'addon/anoncaptcha/anoncaptcha.php', 'anoncaptcha_post_local_start');
+    register_hook('page_end', 'addon/anoncaptcha/anoncaptcha.php', 'anoncaptcha_page_end');
+    set_config('anoncaptcha', 'enabled', 1);
+}
+
+function anoncaptcha_unload() {
+    unregister_hook('post_local_start', 'addon/anoncaptcha/anoncaptcha.php', 'anoncaptcha_post_local_start');
+    unregister_hook('page_end', 'addon/anoncaptcha/anoncaptcha.php', 'anoncaptcha_page_end');
+    del_config('anoncaptcha', 'enabled');
+}
+
+/**
+ * Generate a PNG image with a number and return as base64 data URI.
+ * Uses random background colors and noise to deter bot recognition.
+ */
+function anoncaptcha_generate_image($answer) {
+    $width = 64;
+    $height = 32;
+    $img = imagecreatetruecolor($width, $height);
+
+    // Random background
+    $bgR = rand(180, 230);
+    $bgG = rand(180, 230);
+    $bgB = rand(180, 230);
+    $bg = imagecolorallocate($img, $bgR, $bgG, $bgB);
+    imagefill($img, 0, 0, $bg);
+
+    // Noise lines
+    for ($i = 0; $i < 3; $i++) {
+        $color = imagecolorallocate($img, rand(100, 200), rand(100, 200), rand(100, 200));
+        imageline($img, rand(0, $width), rand(0, $height), rand(0, $width), rand(0, $height), $color);
+    }
+    // Noise dots
+    for ($i = 0; $i < 10; $i++) {
+        $color = imagecolorallocate($img, rand(100, 200), rand(100, 200), rand(100, 200));
+        imagesetpixel($img, rand(0, $width), rand(0, $height), $color);
+    }
+
+    // High contrast text (complementary to background)
+    imagestring($img, 5, ($width - 40) / 2, 4, (string)$answer,
+        imagecolorallocate($img, 255 - $bgR, 255 - $bgG, 255 - $bgB));
+
+    // Encode as base64 data URI
+    ob_start();
+    imagepng($img);
+    $data = ob_get_contents();
+    ob_end_clean();
+    imagedestroy($img);
+
+    return 'data:image/png;base64,' . base64_encode($data);
+}
+
+/**
+ * Generate a captcha token containing a random sum and an HMAC-signed payload.
+ * If use_image is enabled, embeds base64 images for each operand.
+ */
+function anoncaptcha_generate_token() {
+    $use_image = get_config('anoncaptcha', 'use_image', false);
+    $a = rand(5, 49);
+    $b = rand(5, 49);
+    $answer = $a + $b;
+    $expires = time() + ANONCAPTCHA_LIFE;
+    $data = $answer . '|' . $expires;
+    $hmac = hash_hmac('sha256', $data, ANONCAPTCHA_SECRET);
+
+    $token = [
+        'token' => base64_encode($hmac . '|' . $data),
+        'a' => $a,
+        'b' => $b,
+        'use_image' => $use_image,
+    ];
+
+    if ($use_image) {
+        $token['img_a'] = anoncaptcha_generate_image($a);
+        $token['img_b'] = anoncaptcha_generate_image($b);
+    }
+
+    return $token;
+}
+
+/**
+ * Validate the captcha answer submitted via POST.
+ * Checks that both token and answer are present, the answer is numeric,
+ * and that the HMAC token is valid and not expired.
+ */
+function anoncaptcha_validate() {
+    $token = $_POST['anoncaptcha_token'] ?? '';
+    $submitted = trim($_POST['anoncaptcha_answer'] ?? '');
+
+    if ($token === '' || $submitted === '') {
+        return false;
+    }
+    if (!is_numeric($submitted)) {
+        return false;
+    }
+
+    $correct = anoncaptcha_validate_token($token);
+    if ($correct === false) {
+        return false;
+    }
+    return (int)$submitted === $correct;
+}
+
+/**
+ * Decode and verify an HMAC captcha token.
+ * Returns the correct answer on success, or false if the token is
+ * malformed, expired, or has an invalid signature.
+ */
+function anoncaptcha_validate_token($token) {
+    $decoded = @base64_decode($token);
+    if (!$decoded || !str_contains($decoded, '|')) {
+        return false;
+    }
+    $parts = explode('|', $decoded, 3);
+    if (count($parts) !== 3) {
+        return false;
+    }
+
+    $hmac = $parts[0];
+    $answer = $parts[1];
+    $expires = (int)$parts[2];
+
+    // Reject expired tokens
+    if ($expires < time()) {
+        return false;
+    }
+
+    // Verify HMAC signature (constant-time comparison)
+    $data = $answer . '|' . $expires;
+    $expected_hmac = hash_hmac('sha256', $data, ANONCAPTCHA_SECRET);
+    if (!hash_equals($expected_hmac, $hmac)) {
+        return false;
+    }
+
+    return (int)$answer;
+}
+
+/**
+ * Render the captcha form as HTML.
+ * Shows image-based operands when use_image is enabled, otherwise text.
+ */
+function anoncaptcha_render_captcha() {
+    $gen = anoncaptcha_generate_token();
+    $use_image = $gen['use_image'];
+
+    $question = sprintf(t('What is %d + %d?'), $gen['a'], $gen['b']);
+
+    if ($use_image) {
+        return '<div class="anoncaptcha-form mb-3">'
+            . '<label style="display:block;margin-bottom:6px;font-size:1.1em;">'
+            . '<img src="' . $gen['img_a'] . '" style="vertical-align:middle;" />'
+            . ' + '
+            . '<img src="' . $gen['img_b'] . '" style="vertical-align:middle;" />'
+            . ' = ?'
+            . '</label>'
+            . '<input type="text" name="anoncaptcha_answer" required class="form-control" style="width:auto;max-width:200px;" autocomplete="off" />'
+            . '<input type="hidden" name="anoncaptcha_token" value="' . htmlspecialchars($gen['token']) . '" />'
+            . '<small class="form-text text-muted">' . t('Captcha') . '</small>'
+            . '</div>';
+    }
+
+    return '<div class="anoncaptcha-form mb-3">'
+        . '<label style="display:block;margin-bottom:6px;">'
+        . htmlspecialchars($question)
+        . '</label>'
+        . '<input type="text" name="anoncaptcha_answer" required class="form-control" style="width:auto;max-width:200px;" autocomplete="off" />'
+        . '<input type="hidden" name="anoncaptcha_token" value="' . htmlspecialchars($gen['token']) . '" />'
+        . '<small class="form-text text-muted">' . t('Captcha') . '</small>'
+        . '</div>';
+}
+
+/**
+ * Hook: post_local_start — validate captcha before a comment is persisted.
+ * Skips preview submissions and logged-in users (non-anonymous).
+ */
+function anoncaptcha_post_local_start(&$data) {
+    if (!empty($_POST['preview'])) {
+        return;
+    }
+    if (empty($_POST['anonname']) || empty($_POST['anonmail'])) {
+        return;
+    }
+
+    if (!anoncaptcha_validate()) {
+        $_SESSION['_NOTICES_'] ??= [];
+        $_SESSION['_NOTICES_'][] = t('Captcha verification failed. Please try again.');
+
+        header('Content-Type: application/json');
+        $msg = addslashes(t('Captcha verification failed. Please try again.'));
+        echo json_encode(['captcha_fail' => true, 'error_msg' => $msg, 'success' => false]);
+        exit;
+    }
+}
+
+/**
+ * Hook: page_end — inject JavaScript into the page footer.
+ * On /moderate pages: adds Approve/Delete buttons (not rendered by default).
+ * On other pages: injects the captcha form into anonymous comment editors
+ *                  and hides moderation buttons for unauthenticated visitors.
+ */
+function anoncaptcha_page_end($content) {
+    // Skip POST requests (AJAX form submissions)
+    if ($_SERVER['REQUEST_METHOD'] === 'POST') {
+        return;
+    }
+
+    $path = $_SERVER['REQUEST_URI'] ?? '';
+    if (strpos($path, '/moderate') !== false) {
+        // Inject Approve/Delete buttons on /moderate pages
+        $mod_js = <<<JSEOF
+<script>
+(function(){
+var added=new Set();
+function addModerButtons(){
+    var items = document.querySelectorAll('[id*="wall-item-content-wrapper-"]');
+    for(var i=0;i<items.length;i++){
+        var item = items[i];
+        var id = item.id;
+        if(added.has(id)) continue;
+        var match = id.match(/(\d+)/);
+        if(!match) continue;
+        var num = match[1];
+        added.add(id);
+        var btns = document.createElement('div');
+        btns.className = 'moderate-buttons';
+        btns.style.cssText = 'margin:10px 0;display:flex;gap:8px;clear:both;';
+        btns.innerHTML = '<a href="moderate/'+num+'/approve" class="btn btn-sm btn-outline-success"><i class="bi bi-check-lg"></i> Approve</a>'
+            + '<a href="moderate/'+num+'/drop" class="btn btn-sm btn-outline-danger"><i class="bi bi-trash"></i> Delete</a>';
+        var tools = item.querySelector('#wall-item-tools-right-'+num);
+        if(tools){
+            tools.parentNode.insertBefore(btns, tools.nextSibling);
+        } else {
+            item.parentNode.appendChild(btns);
+        }
+    }
+}
+try{addModerButtons();}catch(e){}
+if(typeof MutationObserver!=="undefined"){
+    try{var mo=new MutationObserver(addModerButtons);mo.observe(document.body,{childList:true,subtree:true});}catch(e){}
+}
+})();
+</script>
+JSEOF;
+        App::$page['content'] .= $mod_js;
+        return;
+    }
+
+    // Encode captcha HTML as base64 to safely embed in JavaScript
+    $captcha_html = anoncaptcha_render_captcha();
+    $b64 = base64_encode($captcha_html);
+
+    $js = <<<JSEOF
+<script>
+(function(){
+// Show alert when captcha validation fails on item submission
+if(typeof jQuery!=='undefined'){
+    jQuery(document).ajaxComplete(function(event, xhr, settings){
+        if(settings && settings.url && settings.url.indexOf('item')!==-1){
+            try{
+                var resp = JSON.parse(xhr.responseText);
+                if(resp && resp.captcha_fail){
+                    alert(resp.error_msg || 'Captcha failed');
+                }
+            }catch(e){}
+        }
+    });
+}
+
+// Detect whether the visitor is logged in by checking for
+// elements that only appear for authenticated users.
+function isLoggedIn(){
+    if(document.querySelector('#my_channels')) return true;
+    if(document.querySelector('#user-menu')) return true;
+    if(document.querySelector('#profile-link')) return true;
+    if(document.querySelector('#settings-link')) return true;
+    return false;
+}
+
+// Hide moderation buttons for anonymous visitors only.
+function hideModButtons(){
+    if(isLoggedIn()) return;
+    var els = document.querySelectorAll('a[href*="moderate"]');
+    for(var i=0;i<els.length;i++){
+        var h=els[i].href||els[i].getAttribute('href')||'';
+        if(/\\/moderate\\/\\d+\\/(approve|drop)/i.test(h) || /\\/moderate\\/\\d+$/i.test(h)){
+            els[i].style.display='none';
+            els[i].parentNode.style.display='none';
+        }
+    }
+}
+try{hideModButtons();}catch(e){}
+if(typeof MutationObserver!=="undefined"){
+    try{
+        var mo=new MutationObserver(function(){
+            if(!isLoggedIn()) hideModButtons();
+        });
+        mo.observe(document.body,{childList:true,subtree:true});
+    }catch(e){}
+}
+
+// Inject captcha form into anonymous comment editors.
+var h=atob('{$b64}');
+function addC(){
+    var els=document.querySelectorAll('[id^="comment-edit-anon"]');
+    for(var i=0;i<els.length;i++){
+        if(!els[i].querySelector(".anoncaptcha-form")){
+            var d=document.createElement("div");
+            d.className="anoncaptcha-form";
+            d.innerHTML=h;
+            els[i].appendChild(d);
+        }
+    }
+}
+try{addC();}catch(e){}
+if(typeof MutationObserver!=="undefined"){
+    try{var m=new MutationObserver(addC);m.observe(document.body,{childList:true,subtree:true});}catch(e){}
+}
+})();
+</script>
+JSEOF;
+
+    App::$page['content'] .= $js;
+}
+
+function anoncaptcha_plugin_admin(&$a) {
+    $use_image = get_config('anoncaptcha', 'use_image', false);
+    $t = get_markup_template('admin.tpl', 'addon/anoncaptcha/');
+    $a = replace_macros($t, [
+        '$submit' => t('Submit'),
+        '$use_image' => ['use_image', t('Draw digital symbols using graphics'), $use_image, t('When enabled, captcha numbers will be drawn as small images instead of text.')],
+    ]);
+}
+
+function anoncaptcha_plugin_admin_post() {
+    $use_image = intval($_POST['use_image'] ?? 0);
+    set_config('anoncaptcha', 'use_image', $use_image);
+    info(t('Settings updated.') . EOL);
+}
diff --git a/anoncaptcha/lang/de/strings.php b/anoncaptcha/lang/de/strings.php
new file mode 100644
index 0000000..66f5528
--- /dev/null
+++ b/anoncaptcha/lang/de/strings.php
@@ -0,0 +1,17 @@
+<?php
+/**
+ * German strings for AnonCaptcha addon
+ */
+
+App::$strings = [
+	"Enable AnonCaptcha" => "AnonCaptcha aktivieren",
+	"When enabled, anonymous users must solve a math captcha before submitting comments." => "Wenn aktiviert, müssen anonyme Benutzer eine mathematische Aufgabe lösen, bevor sie einen Kommentar absenden.",
+	"Submit" => "Absenden",
+	"Captcha verification failed. Please try again." => "Captcha-Überprüfung fehlgeschlagen. Bitte versuchen Sie es erneut.",
+	"What is %d + %d?" => "Wie viel ist %d + %d?",
+	"Draw digital symbols using graphics" => "Ziffern als Grafik darstellen",
+	"When enabled, captcha numbers will be drawn as small images instead of text." => "Wenn aktiviert, werden die Captcha-Ziffern als kleine Bilder statt als Text dargestellt.",
+	"Settings updated." => "Einstellungen aktualisiert.",
+	"Captcha" => "Captcha",
+	"anti-spam" => "Antispam",
+];
diff --git a/anoncaptcha/lang/en/strings.php b/anoncaptcha/lang/en/strings.php
new file mode 100644
index 0000000..4cfa4bb
--- /dev/null
+++ b/anoncaptcha/lang/en/strings.php
@@ -0,0 +1,17 @@
+<?php
+/**
+ * English strings for AnonCaptcha addon
+ */
+
+App::$strings = [
+	"Enable AnonCaptcha" => "Enable AnonCaptcha",
+	"When enabled, anonymous users must solve a math captcha before submitting comments." => "When enabled, anonymous users must solve a math captcha before submitting comments.",
+	"Submit" => "Submit",
+	"Captcha verification failed. Please try again." => "Captcha verification failed. Please try again.",
+	"What is %d + %d?" => "What is %d + %d?",
+	"Draw digital symbols using graphics" => "Draw digital symbols using graphics",
+	"When enabled, captcha numbers will be drawn as small images instead of text." => "When enabled, captcha numbers will be drawn as small images instead of text.",
+	"Settings updated." => "Settings updated.",
+	"Captcha" => "Captcha",
+	"anti-spam" => "anti-spam",
+];
diff --git a/anoncaptcha/lang/es/strings.php b/anoncaptcha/lang/es/strings.php
new file mode 100644
index 0000000..9a4a5f5
--- /dev/null
+++ b/anoncaptcha/lang/es/strings.php
@@ -0,0 +1,17 @@
+<?php
+/**
+ * Spanish strings for AnonCaptcha addon
+ */
+
+App::$strings = [
+	"Enable AnonCaptcha" => "Habilitar AnonCaptcha",
+	"When enabled, anonymous users must solve a math captcha before submitting comments." => "Cuando está habilitado, los usuarios anónimos deben resolver un captcha matemático antes de enviar un comentario.",
+	"Submit" => "Enviar",
+	"Captcha verification failed. Please try again." => "Verificación del captcha fallida. Por favor, inténtelo de nuevo.",
+	"What is %d + %d?" => "¿Cuánto es %d + %d?",
+	"Draw digital symbols using graphics" => "Mostrar dígitos como imagen",
+	"When enabled, captcha numbers will be drawn as small images instead of text." => "Cuando está habilitado, los números del captcha se mostrarán como imágenes en lugar de texto.",
+	"Settings updated." => "Configuración actualizada.",
+	"Captcha" => "Captcha",
+	"anti-spam" => "antispam",
+];
diff --git a/anoncaptcha/lang/fr/strings.php b/anoncaptcha/lang/fr/strings.php
new file mode 100644
index 0000000..d1b43da
--- /dev/null
+++ b/anoncaptcha/lang/fr/strings.php
@@ -0,0 +1,17 @@
+<?php
+/**
+ * French strings for AnonCaptcha addon
+ */
+
+App::$strings = [
+	"Enable AnonCaptcha" => "Activer AnonCaptcha",
+	"When enabled, anonymous users must solve a math captcha before submitting comments." => "Lorsqu'activé, les utilisateurs anonymes doivent résoudre un captcha mathématique avant de soumettre un commentaire.",
+	"Submit" => "Soumettre",
+	"Captcha verification failed. Please try again." => "Échec de la vérification du captcha. Veuillez réessayer.",
+	"What is %d + %d?" => "Combien font %d + %d ?",
+	"Draw digital symbols using graphics" => "Afficher les chiffres sous forme d'images",
+	"When enabled, captcha numbers will be drawn as small images instead of text." => "Lorsqu'activé, les chiffres du captcha seront affichés sous forme d'images plutôt qu'en texte.",
+	"Settings updated." => "Paramètres mis à jour.",
+	"Captcha" => "Captcha",
+	"anti-spam" => "anti-spam",
+];
diff --git a/anoncaptcha/lang/ru/strings.php b/anoncaptcha/lang/ru/strings.php
new file mode 100644
index 0000000..1bccdb0
--- /dev/null
+++ b/anoncaptcha/lang/ru/strings.php
@@ -0,0 +1,17 @@
+<?php
+/**
+ * Russian strings for AnonCaptcha addon
+ */
+
+App::$strings = [
+	"Enable AnonCaptcha" => "Включить AnonCaptcha",
+	"When enabled, anonymous users must solve a math captcha before submitting comments." => "При включении анонимные пользователи должны решить математическую капчу перед отправкой комментария.",
+	"Submit" => "Отправить",
+	"Captcha verification failed. Please try again." => "Ошибка проверки капчи. Попробуйте снова.",
+	"What is %d + %d?" => "Чему равно %d + %d?",
+	"Draw digital symbols using graphics" => "Отрисовывать символы графически",
+	"When enabled, captcha numbers will be drawn as small images instead of text." => "При включении капча отображается как изображения вместо текста.",
+	"Settings updated." => "Настройки обновлены.",
+	"Captcha" => "Капча",
+	"anti-spam" => "от спама",
+];
diff --git a/anoncaptcha/view/tpl/admin.tpl b/anoncaptcha/view/tpl/admin.tpl
new file mode 100644
index 0000000..df4eeed
--- /dev/null
+++ b/anoncaptcha/view/tpl/admin.tpl
@@ -0,0 +1,2 @@
+{{include file="field_checkbox.tpl" field=$use_image}}
+<div class="submit"><input type="submit" name="page_site" value="{{$submit}}" /></div>
diff --git a/anoncaptcha/view/tpl/captcha_form.tpl b/anoncaptcha/view/tpl/captcha_form.tpl
new file mode 100644
index 0000000..0a616db
--- /dev/null
+++ b/anoncaptcha/view/tpl/captcha_form.tpl
@@ -0,0 +1,5 @@
+<div class="anoncaptcha-field" style="margin: 8px 0; padding: 10px; background: #f5f5f5; border-radius: 4px; border: 1px solid #ddd;">
+    <label for="anoncaptcha_answer" style="display: block; margin-bottom: 6px; font-weight: bold;">{{ $captcha_question }}:</label>
+    <input type="text" id="anoncaptcha_answer" name="anoncaptcha_answer" required style="width: 100px; padding: 4px 8px; border: 1px solid #ccc; border-radius: 3px;" autocomplete="off" />
+    <span style="margin-left: 8px; color: #666; font-size: 0.9em;">(anti-spam)</span>
+</div>