diff --git a/api/services/PostcodeService.php b/api/services/PostcodeService.php
index 69aa91d..4ede5fe 100644
--- a/api/services/PostcodeService.php
+++ b/api/services/PostcodeService.php
@@ -1,20 +1,22 @@
 <?php
 /**
  * Postcode Service - Handles postcode lookup via postcode.tech API
+ * with fallback to openpostcode.nl API
  */
 
 class PostcodeService
 {
     /**
      * Lookup address by postcode and house number
-     * 
+     * Uses postcode.tech as primary, falls back to openpostcode.nl
+     *
      * @param string $postcode
      * @param string $number
      * @return array
      */
     public static function lookup(string $postcode, string $number): array
     {
-        $postcode = str_replace(' ', '', $postcode);
+        $postcode = strtoupper(str_replace(' ', '', $postcode));
         
         if (empty($postcode) || empty($number)) {
             return [
@@ -24,6 +26,26 @@ class PostcodeService
             ];
         }
         
+        // Try primary service (postcode.tech)
+        $result = self::lookupPostcodeTech($postcode, $number);
+        
+        // If primary service fails (server error or timeout), try fallback
+        if (!$result['success'] && $result['http_code'] >= 500) {
+            $result = self::lookupOpenPostcode($postcode, $number);
+        }
+        
+        return $result;
+    }
+    
+    /**
+     * Lookup via postcode.tech API (primary)
+     *
+     * @param string $postcode
+     * @param string $number
+     * @return array
+     */
+    private static function lookupPostcodeTech(string $postcode, string $number): array
+    {
         $url = "https://postcode.tech/api/v1/postcode?postcode={$postcode}&number={$number}";
         
         $ch = curl_init($url);
@@ -42,21 +64,16 @@ class PostcodeService
         if ($curlError || $httpCode >= 500) {
             return [
                 'success' => false,
-                'error' => 'Postcode service niet bereikbaar, vul straat en woonplaats zelf in',
+                'error' => 'Postcode.tech service niet bereikbaar',
                 'details' => $curlError,
                 'http_code' => 503
             ];
         }
         
         if ($httpCode >= 400) {
-            $decoded = json_decode($response, true);
-            $errorMessage = ($decoded && isset($decoded['error'])) 
-                ? $decoded['error'] 
-                : 'Postcode niet gevonden of ongeldige invoer, vul straat en woonplaats zelf in';
-            
             return [
                 'success' => false,
-                'error' => $errorMessage,
+                'error' => self::translateErrorMessage($response, $httpCode),
                 'http_code' => $httpCode
             ];
         }
@@ -69,4 +86,123 @@ class PostcodeService
             'http_code' => 200
         ];
     }
+    
+    /**
+     * Lookup via openpostcode.nl API (fallback)
+     * No authentication required
+     *
+     * @param string $postcode
+     * @param string $number
+     * @return array
+     */
+    private static function lookupOpenPostcode(string $postcode, string $number): array
+    {
+        $url = "https://openpostcode.nl/api/address?postcode={$postcode}&huisnummer={$number}";
+        
+        $ch = curl_init($url);
+        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
+        curl_setopt($ch, CURLOPT_TIMEOUT, 10);
+        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 5);
+        
+        $response = curl_exec($ch);
+        $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
+        $curlError = curl_error($ch);
+        curl_close($ch);
+        
+        if ($curlError || $httpCode >= 500) {
+            return [
+                'success' => false,
+                'error' => 'Postcode service niet bereikbaar, vul straat en woonplaats zelf in',
+                'details' => $curlError,
+                'http_code' => 503
+            ];
+        }
+        
+        if ($httpCode >= 400) {
+            return [
+                'success' => false,
+                'error' => self::translateErrorMessage($response, $httpCode),
+                'http_code' => $httpCode
+            ];
+        }
+        
+        $data = json_decode($response, true);
+        
+        // Transform openpostcode.nl response to match postcode.tech format
+        $transformedData = self::transformOpenPostcodeResponse($data);
+        
+        return [
+            'success' => true,
+            'data' => $transformedData,
+            'http_code' => 200
+        ];
+    }
+    
+    /**
+     * Transform openpostcode.nl response to match postcode.tech format
+     *
+     * openpostcode.nl returns:
+     * - postcode, huisnummer, straat, buurt, wijk, woonplaats, gemeente, provincie, latitude, longitude
+     *
+     * postcode.tech returns:
+     * - postcode, number, street, city, municipality, province, geo (lat, lng)
+     *
+     * @param array $data
+     * @return array
+     */
+    private static function transformOpenPostcodeResponse(array $data): array
+    {
+        return [
+            'postcode' => $data['postcode'] ?? '',
+            'number' => $data['huisnummer'] ?? '',
+            'street' => $data['straat'] ?? '',
+            'city' => $data['woonplaats'] ?? '',
+            'municipality' => $data['gemeente'] ?? '',
+            'province' => $data['provincie'] ?? '',
+            'geo' => [
+                'lat' => $data['latitude'] ?? null,
+                'lng' => $data['longitude'] ?? null
+            ]
+        ];
+    }
+    
+    /**
+     * Translate API error messages to user-friendly Dutch messages
+     *
+     * @param string $response Raw API response
+     * @param int $httpCode HTTP status code
+     * @return string User-friendly error message in Dutch
+     */
+    private static function translateErrorMessage(string $response, int $httpCode): string
+    {
+        $decoded = json_decode($response, true);
+        $apiError = ($decoded && isset($decoded['error'])) ? strtolower($decoded['error']) : '';
+        
+        // Map common API error messages to Dutch user-friendly messages
+        if (strpos($apiError, 'huisnummer not found') !== false ||
+            strpos($apiError, 'house number not found') !== false ||
+            strpos($apiError, 'number not found') !== false) {
+            return 'Dit huisnummer is niet gevonden bij deze postcode. Controleer het huisnummer of vul het adres handmatig in.';
+        }
+        
+        if (strpos($apiError, 'postcode not found') !== false ||
+            strpos($apiError, 'invalid postcode') !== false) {
+            return 'Deze postcode is niet gevonden. Controleer de postcode of vul het adres handmatig in.';
+        }
+        
+        if (strpos($apiError, 'invalid') !== false) {
+            return 'Ongeldige invoer. Controleer de postcode en het huisnummer.';
+        }
+        
+        if ($httpCode === 404) {
+            return 'Adres niet gevonden. Controleer de postcode en het huisnummer of vul het adres handmatig in.';
+        }
+        
+        if ($httpCode === 429) {
+            return 'Te veel verzoeken. Probeer het later opnieuw of vul het adres handmatig in.';
+        }
+        
+        // Default message
+        return 'Adres niet gevonden. Vul straat en woonplaats handmatig in.';
+    }
 }
diff --git a/index.html b/index.html
index 60029b8..8d1d088 100644
--- a/index.html
+++ b/index.html
@@ -200,10 +200,25 @@
                         </template>
                     </select>
                 </div>
+                <div x-show="recommendedOptions.length > 0" x-cloak class="mt-8 space-y-3">
+                    <p class="text-[10px] font-black text-red-500 uppercase tracking-widest italic px-2 text-center">
+                        Wellicht ook interessant</p>
 
+                    <template x-for="u in recommendedOptions" :key="u.id">
+                        <div
+                            class="flex items-center justify-between p-4 border rounded-2xl bg-slate-50 hover:bg-white transition-all shadow-sm">
+                            <span class="text-xs font-bold text-slate-700"
+                                x-text="u.name + ' (€' + u.price + ')'"></span>
+                            <button @click="toggleUpsell(u)" :class="isInCart(u.id) ? 'bg-red-500' : 'bg-green-600'"
+                                class="text-white px-6 py-2 rounded-xl text-[10px] font-black uppercase shadow-md"
+                                x-text="isInCart(u.id) ? 'Verwijder' : 'Voeg toe'">
+                            </button>
+                        </div>
+                    </template>
+                </div>
                 <div class="mt-8 border-t pt-6">
                     <h2 class="font-bold mb-4 text-slate-400 uppercase text-[10px] tracking-widest italic text-center">
-                        Extra's</h2>
+                        Voeg extra product toe</h2>
                     <div class="flex gap-2">
                         <!-- Custom searchable dropdown for extra products -->
                         <div class="relative flex-1" x-data="{ openExtra: false }" @click.away="openExtra = false">
@@ -244,22 +259,7 @@
                     </div>
                 </div>
 
-                <div x-show="recommendedOptions.length > 0" x-cloak class="mt-8 space-y-3">
-                    <p class="text-[10px] font-black text-red-500 uppercase tracking-widest italic px-2 text-center">
-                        Aanbevolen</p>
 
-                    <template x-for="u in recommendedOptions" :key="u.id">
-                        <div
-                            class="flex items-center justify-between p-4 border rounded-2xl bg-slate-50 hover:bg-white transition-all shadow-sm">
-                            <span class="text-xs font-bold text-slate-700"
-                                x-text="u.name + ' (€' + u.price + ')'"></span>
-                            <button @click="toggleUpsell(u)" :class="isInCart(u.id) ? 'bg-red-500' : 'bg-green-600'"
-                                class="text-white px-6 py-2 rounded-xl text-[10px] font-black uppercase shadow-md"
-                                x-text="isInCart(u.id) ? 'Verwijder' : 'Voeg toe'">
-                            </button>
-                        </div>
-                    </template>
-                </div>
             </div>
 
             <div class="col-span-12 lg:col-span-3">
diff --git a/js/components/forms.js b/js/components/forms.js
index 0a6e052..d56794f 100644
--- a/js/components/forms.js
+++ b/js/components/forms.js
@@ -58,8 +58,8 @@ const FormsComponent = {
                         const data = await ApiService.lookupPostcode(this.form.postcode, this.form.houseno);
                         
                         if (data.street) {
-                            this.form.street = data.street.toUpperCase();
-                            this.form.city = data.city.toUpperCase();
+                            this.form.street = data.street;
+                            this.form.city = data.city;
                         } else if (data.error) {
                             this.addressError = data.error;
                         } else {