duolingo.com

Duolingo.com appears to be a well-established online platform, with a high likelihood of being a legitimate and safe destination for users. The domain's trust score of 63 and verdict of "Likely Safe" suggest a strong reputation, backed by its impressive metrics, such as a fast response time of 17,610 milliseconds and a 200 OK status code. The domain's use of HTTPS and gzip compression further reinforces its secure nature, making it an attractive option for users seeking online learning resources.

Duolingo's trust score of 63 is a testament to its strong reputation. The domain's verdict of "Likely Safe" is supported by its minimal risk of malware, phishing, or other malicious activities. The presence of a valid SSL certificate, issued by Amazon, adds an extra layer of security, ensuring that sensitive data remains protected. Furthermore, the domain's compliance with DMARC and SPF protocols demonstrates a commitment to email authentication and anti-spam measures, further enhancing its trustworthiness.

Duolingo's technology stack is comprised of five distinct technologies, including React, Webpack, Google Tag Manager, reCAPTCHA v3, and Amazon CloudFront. This diverse array of tools suggests a sophisticated and modern approach to web development, allowing for efficient and scalable deployment of the platform. The use of React and Webpack indicates a focus on front-end development, while Google Tag Manager and reCAPTCHA v3 provide additional layers of security and analytics. Amazon CloudFront, meanwhile, enables content delivery and distribution across the globe.

duolingo.com delivers its homepage in 17610ms (server response time), which is considered slow by industry standards. The total page weight is 11 KB, and we detected 49 resource requests loading assets from 5 third-party domains. A high number of third-party domains can significantly impact page load time due to additional DNS lookups and TLS handshakes required for each domain. The website uses Gzip compression for text-based assets, achieving an estimated 60.0% reduction in transfer size. This reduces bandwidth usage and improves page load times, especially for visitors on slower connections. Asset minification status: 0 out of 2 CSS files and 0 out of 9 JavaScript files are minified. Minifying the remaining 11 unminified file(s) could further reduce page weight by 10-30% for those assets. Minification is a best practice that reduces download sizes without affecting functionality. The site is served through a Content Delivery Network (CDN), which caches static assets at edge servers around the world. This means visitors from different geographic regions receive content from the nearest edge server, significantly reducing latency. CDN usage is particularly important for websites with a global audience, as it can reduce page load times by 40-60% for distant visitors. From an environmental perspective, each page view of duolingo.com produces approximately 0.01g of CO₂, earning a carbon rating of A. This places the website among the cleanest on the web, demonstrating efficient use of server resources and optimized content delivery. For reference, the average web page produces about 0.5g of CO₂ per page view. The page weight of 11 KB is the primary factor in this calculation. Core Web Vitals data from the Chrome User Experience Report (CrUX) is not available for duolingo.com. This typically means the site doesn't have enough real-world Chrome user traffic to generate statistically significant field data, or the domain is not included in the CrUX dataset. Core Web Vitals (LCP, INP, CLS) are important Google ranking factors that measure real user experience.

Duolingo's infrastructure appears to be well-organized and scalable, with a single IP address (98.95.113.153) serving as the primary entry point. The domain's MX record points to Google Workspace, indicating a reliance on cloud-based email services. The registrar information remains null, suggesting that the domain may not be actively managed or updated. However, the presence of SPF and DMARC protocols implies a commitment to email security and authentication.

The homepage of duolingo.com contains 1 word of visible text content. This is a relatively short page — adding more descriptive content could improve search engine visibility. The page is structured with 0 H2 headings, 0 H3 headings, 0 H4 headings. The link structure consists of 0 internal links pointing to other pages on the same domain and 0 external links pointing to third-party websites. There are 9 external JavaScript files, 2 CSS stylesheets, and 1 iframes on the page. The site implements the following web standards and features: Progressive Web App (PWA) manifest (enabling app-like installation). Notable missing features: XML Sitemap, robots.txt, and Schema.org structured data. Adding these could improve search engine discoverability and rich result eligibility.

Duolingo's page size is relatively small, at 11KB, which suggests an optimized approach to content delivery. The domain's word count is a mere 1, indicating a concise and focused approach to content creation. The absence of images on the main page may be a deliberate design choice, prioritizing speed and simplicity over visual appeal. The title "Duolingo" is straightforward and to the point, providing a clear indication of the domain's purpose. Overall, Duolingo's SEO strategy appears to prioritize speed, security, and content focus, making it an attractive option for users seeking online learning resources.