studysapuri.jp

We performed a comprehensive analysis of studysapuri.jp on 2026-06-30. The website returned an HTTP 200 status code with a server response time of 31894ms. The page is served over HTTP/2 protocol with Gzip compression enabled, achieving approximately 60.0% size reduction. The total page weight is 137 KB, and the site is served behind a CDN (Content Delivery Network). The website uses a secure HTTPS connection with a valid SSL certificate issued by Amazon (DV type). The connection is encrypted using TLS 1.3 with the TLS_AES_128_GCM_SHA256 cipher suite and sha256WithRSAEncryption signature algorithm. The certificate covers 1 domain(s) (Subject Alternative Names) and expires on 2026-11-17, which is 140 days from now. The security headers analysis reveals a score of 0/100 (poor). No security headers are configured, which is a significant security concern. However, the site is missing Content-Security-Policy, Strict-Transport-Security (HSTS), X-Frame-Options, X-Content-Type-Options, Referrer-Policy, and Permissions-Policy, which could expose the site and its users to cross-site scripting (XSS), clickjacking, and other web-based attacks. Our technology detection scan identified 8 technologies across 8 categories powering studysapuri.jp. The detected stack includes Next.js media, React, Webpack, Google Analytics 4, Google Tag Manager, Google Ads, Optimizely, and Marketo. The site uses Next.js as its primary framework (version media). The UI is built with React. Based on our comprehensive analysis of domain age, SSL configuration, email authentication, security headers, and blacklist status, studysapuri.jp receives an overall trust score of 66/100, classified as "Likely Safe".

After conducting a thorough safety and legitimacy analysis, studysapuri.jp receives a trust score of 66/100, which places it in the "Likely Safe" category. This score is calculated by evaluating multiple factors including SSL certificate validity, domain registration history, email authentication protocols, security header configuration, and blacklist status across major threat intelligence databases. The analysis identified several positive trust signals: a valid HTTPS connection protecting data in transit, a valid SSL certificate issued by Amazon with 140 days until expiration, SPF (Sender Policy Framework) email authentication preventing email spoofing, and DMARC email authentication with a quarantine policy. Areas of concern include: the absence of a Content-Security-Policy header, which leaves the site more vulnerable to cross-site scripting (XSS) attacks, no X-Frame-Options header, which could allow the site to be embedded in malicious iframes (clickjacking), missing Referrer-Policy, potentially leaking URL information to third parties, the domain's WHOIS information is hidden behind a privacy service, making it harder to verify the owner's identity, and DNSSEC is not enabled, leaving DNS queries vulnerable to spoofing attacks. While these issues don't necessarily indicate malicious intent, they represent areas where the website's security posture could be improved. We checked studysapuri.jp against 8 major blacklist databases including Google Safe Browsing, Phishtank, Urlhaus, Openphish, Dnsfilter, Spamhaus Dbl, Surbl, and Virustotal. The domain passed all 8 checks with a clean status, meaning it has not been flagged for phishing, malware distribution, spam, or other malicious activities by any of the tested threat intelligence providers.

Our technology detection engine scanned studysapuri.jp and identified 8 distinct technologies across 8 categories. This analysis is performed by examining HTTP response headers, HTML source code patterns, JavaScript library fingerprints, CSS framework signatures, and DNS records. Framework: Next.js (version media) — provides the application framework and routing for studysapuri.jp. UI Library: React — handles the user interface rendering and component management for studysapuri.jp. Build Tool: Webpack — bundles and optimizes the JavaScript and CSS assets for studysapuri.jp. Analytics: Google Analytics 4 — tracks visitor behavior and provides traffic insights for studysapuri.jp. Tag Manager: Google Tag Manager — manages marketing and analytics tags without code changes for studysapuri.jp. Advertising: Google Ads — handles advertising pixel tracking and conversion measurement for studysapuri.jp. A/B Testing: Optimizely — enables experimentation and conversion optimization for studysapuri.jp. Marketing: Marketo — provides marketing automation capabilities for studysapuri.jp. We also extracted the following tracking identifiers: Google Tag Manager container GTM-MPMN76D. These IDs can be used to identify other websites operated by the same organization.

studysapuri.jp delivers its homepage in 31894ms (server response time), which is considered slow by industry standards. The total page weight is 137 KB, and we detected 181 resource requests loading assets from 55 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 12 JavaScript files are minified. Minifying the remaining 14 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 studysapuri.jp produces approximately 0.07g 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 137 KB is the primary factor in this calculation. Core Web Vitals data from the Chrome User Experience Report (CrUX) is not available for studysapuri.jp. 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.

studysapuri.jp resolves to the IPv4 address 18.165.140.2, but does not support IPv6. IPv6 adoption is increasingly important as IPv4 address space becomes exhausted, and some ISPs and regions are transitioning to IPv6-only connectivity. The domain has 4 A record(s) configured. The domain name system is managed by 4 name servers: ns-1499.awsdns-59.org, ns-1882.awsdns-43.co.uk, ns-220.awsdns-27.com, and ns-629.awsdns-14.net. Having 4 name servers provides good redundancy — if one fails, the others can continue serving DNS queries. The choice of name servers often indicates the DNS hosting provider or CDN service being used. Email for studysapuri.jp is handled by amazonaws.com with 1 MX records configured: inbound-smtp.ap-northeast-1.amazonaws.com. Multiple MX records provide failover redundancy — if the primary mail server is unavailable, email will be routed to the next available server. SPF (Sender Policy Framework) is configured, which specifies which mail servers are authorized to send email on behalf of this domain. This helps prevent email spoofing and improves email deliverability. DMARC (Domain-based Message Authentication, Reporting and Conformance) is configured with a quarantine policy — a moderate setting, directing unauthorized emails to spam/junk folders. DKIM was not detected. Without DKIM, recipients cannot cryptographically verify that emails claiming to be from this domain are authentic. DNSSEC is not enabled for studysapuri.jp. While not critical for most websites, DNSSEC adds an important security layer by ensuring DNS responses haven't been tampered with during transit. Enabling DNSSEC is recommended for domains handling sensitive data or financial transactions.

The homepage of studysapuri.jp contains 211 words of visible text content. This is a relatively short page — adding more descriptive content could improve search engine visibility. The page is structured with 6 H2 headings, 0 H3 headings, 0 H4 headings. The page includes 20 images. 7 images (35%) are missing alt text attributes, which is a significant concern for both accessibility and SEO. Screen readers rely on alt text to describe images to visually impaired users, and search engines use alt text to understand image content. Only 65% of images have proper alt text — we recommend adding descriptive alt attributes to all images. The link structure consists of 65 internal links pointing to other pages on the same domain and 60 external links pointing to third-party websites. There are 12 external JavaScript files, 2 CSS stylesheets, and 0 iframes on the page. The site implements the following web standards and features: XML Sitemap (helps search engines discover all pages) and robots.txt (controls search engine crawling behavior). Notable missing features: Schema.org structured data. Adding these could improve search engine discoverability and rich result eligibility. The website has social media presence across 2 platforms: Twitter (@studysapuri_hi) and Youtube (@studysapuri1). An active social media presence is a positive trust indicator and helps build brand awareness and customer engagement.

The title tag for studysapuri.jp is good at 25 characters: "【公式】スタディサプリ｜大人の英語も、受験勉強も。". The length is acceptable, though it may be slightly truncated in some search result displays. The meta description is 98 characters (well-optimized): "小中高校生向けに、4万本以上のプロ講師の授業動画が見放題！分かりやすいと評判の「神授業」だから短時間でギュッと効率的に成績アップが目指せる！塾や予備校・通信教育を圧倒的に下回る料金でご提供します。". Google typically displays up to 155-160 characters of the meta description in search results. A compelling meta description with a clear call-to-action can significantly improve click-through rates from search results. The canonical url is correctly set to https://studysapuri.jp/, preventing duplicate content issues, the page language is declared as ja, the meta robots directive is set to index, and a favicon is configured. Open Graph meta tags are configured with 4/4 recommended fields: OG title ("【公式】スタディサプリ｜大人の英語も、受験勉強も。..."), OG description, OG image (social sharing thumbnail), OG type (website). These tags control how the page appears when shared on Facebook, LinkedIn, and other social media platforms that support the Open Graph protocol. A Twitter Card of type summary_large_image is configured, which controls how links appear when shared on Twitter/X. The "summary_large_image" type displays a large image preview, which typically generates higher engagement rates than the basic card type.