We have implemented comprehensive security and privacy protections at both the technical and policy levels:

1. Step 1: AES-256 Military-Grade Encryption — Kuailian Accelerator employs the globally recognized AES-256 symmetric encryption standard, widely adopted by governments and military institutions worldwide. All data transmitted through Kuailian is encrypted with 256-bit keys, ensuring that even if data packets are intercepted, it would take billions of years to brute-force decrypt them. Whether you're on public WiFi or a home network, your communication remains within an absolutely secure encrypted tunnel at all times.
2. Step 2: Strict No-Logs Policy — Kuailian Accelerator solemnly commits to never recording, tracking, or selling any user internet activity data. Our privacy policy has been reviewed by third-party auditing bodies, explicitly stating that we do not collect browsing history, connection timestamps, IP address logs, DNS query records, or any information that could be linked to personal identity. This means even if legally compelled, we cannot provide user activity data because we never stored it in the first place.
3. Step 3: Multi-Layered Security Protection — Beyond encryption and no-logs policy, Kuailian deploys DNS leak protection, IPv6 leak protection, and WebRTC leak prevention. When a connection drops unexpectedly, the built-in Kill Switch instantly blocks all network traffic, preventing accidental exposure of unencrypted data. These protective layers work together to create a comprehensive privacy shield for worry-free usage in any network environment.
4. Step 4: Proprietary Communication Protocol — Kuailian uses a self-developed proprietary protocol rather than open-source alternatives. The advantages include: protocol signatures are not publicly known, making them harder to identify and block; we can rapidly iterate protocol versions in response to evolving security threats. This protocol has been validated through over 2000 days of stable operation across 100+ countries.
5. Step 5: Regular Security Audits & Transparency Reports — We regularly commission independent third-party security firms to conduct comprehensive penetration tests and security audits of our systems, with results published on our website. We also release periodic transparency reports disclosing government data request volumes and our handling of them, giving users clear insight into how we protect their rights.
6. Step 6: User-Controlled Privacy Settings — The Kuailian client offers extensive privacy customization options, allowing users to flexibly adjust encryption strength, protocol type, Kill Switch behavior, and more. We believe true privacy protection means returning control to the user, enabling personalized privacy configurations tailored to each individual's usage scenarios.

Kuailian Accelerator is committed to full-platform coverage. Here's a detailed device compatibility guide:

1. Step 1: Verify Your OS Version — Kuailian fully supports Windows 10/11, macOS 12+, iOS 15+, Android 10+, and mainstream Linux distributions (Ubuntu, Debian, Fedora, etc.). We recommend updating your OS to the latest version for optimal compatibility and performance. Each platform client is specifically optimized to leverage native OS features for enhanced connection efficiency.
2. Step 2: Download the Platform-Specific Client — Visit the Kuailian website download center, and the system will automatically detect your OS and highlight the recommended version. Windows users get .exe installers, macOS users download .dmg images, iOS users are directed to the App Store, Android users can download APK directly or via Google Play, and Linux users can choose .deb or .rpm packages — ensuring everyone gets the correct version effortlessly.
3. Step 3: One Account for All Devices — After registering one Kuailian account, you can log in across all supported devices without purchasing separate accounts. Simultaneous device limits vary by plan, with basic plans supporting at least 3 concurrent devices and premium plans supporting more. Your preferences and connection history sync automatically across devices upon login.
4. Step 4: Browser Extension Support — Beyond standalone clients, Kuailian offers Chrome and Firefox browser extensions for users who only need browser-level acceleration. Extensions are lightweight, consume minimal resources, and are ideal for temporary use or users concerned about system permissions. They use the same AES-256 encryption as the full client.
5. Step 5: Smart TV & Router Compatibility — For advanced users, Kuailian provides a dedicated Android TV version and configuration guides for mainstream router firmware (OpenWrt, Merlin, etc.). Deploying Kuailian at the router level enables one-stop acceleration coverage for all connected devices in your home, including gaming consoles and smart home devices that cannot install clients directly.

Downloading and installing Kuailian Accelerator is straightforward. Please follow these steps:

1. Step 1: Visit the Official Website — Always download from the official Kuailian website (kuailian.com) to ensure you get genuine, secure, and untampered client software. Never download from third-party sites, forum links, or unverified QR codes, as these may contain bundled malware or adware. The official site uses HTTPS encryption — verify the lock icon in your browser's address bar to confirm a secure connection throughout the download process.
2. Step 2: Select Your Platform's Download Option — Scroll down to the download section on the homepage or click "Download Center" in the top navigation bar. You'll see download cards for Windows, macOS, iOS, Android, and Linux. The system auto-detects your OS and highlights the recommended card. Click the download button to begin. The latest version number and update time are displayed below each platform card.
3. Step 3: Complete the Installation Wizard — After downloading, Windows users double-click the .exe file and follow the installation wizard — we recommend checking "Create desktop shortcut" for quick access. macOS users drag the Kuailian icon from the .dmg into the Applications folder. iOS users complete installation automatically via the App Store. Android users need to enable "Install unknown apps" in system settings before installing the APK, and should disable it afterward for device security. The entire installation typically takes under one minute.
4. Step 4: Register or Log In — Upon first launch, you'll see a clean login/registration interface. New users can register using email or phone number — only basic information and a password are needed, with no sensitive personal data required. Existing users simply enter their credentials; a "Remember password" option is available for convenience. Registration automatically grants free trial access without any extra steps.
5. Step 5: One-Click Connect and Start Using — After logging in, a prominent connect button appears in the center of the main interface. Click it, and Kuailian automatically selects the optimal server node and establishes an encrypted connection — usually within 3 seconds. Once connected, the interface displays the current node location, connection duration, and real-time speed. All your traffic now flows through a secure encrypted tunnel. To switch nodes, manually select a target country or region from the server list.

Kuailian Accelerator is built around a "one-click connect" design philosophy. Here's a detailed daily experience overview:

1. Step 1: Minimalist Interface Design — Kuailian's main interface follows a "less is more" design principle, eliminating all unnecessary complexity. Upon opening the app, you see only a large connect button, a network status indicator, and a clean node selection entry. No cluttered settings menus, no jargon-filled configuration panels — even first-time users can understand how to operate it within 5 seconds, achieving truly zero-learning-curve usability.
2. Step 2: Intelligent Automatic Node Selection — Kuailian's built-in smart acceleration engine automatically analyzes your current network environment when you click connect, comprehensively evaluating latency, load, bandwidth, and other metrics across server nodes to match you with the optimal one in milliseconds. No manual speed testing or complex network topology knowledge is needed. The system continuously monitors connection quality and auto-switches nodes when necessary for the best experience.
3. Step 3: Rich Scenario Adaptations — Kuailian is deeply optimized for different usage scenarios. When watching videos, it prioritizes high-bandwidth nodes and enables dedicated streaming acceleration channels. For online gaming, it optimizes latency paths and reduces packet jitter. For remote work, it prioritizes connection stability with long-duration keep-alive mechanisms. All scenario optimizations happen automatically in the background based on traffic pattern recognition.
4. Step 4: Flexible Manual Configuration — For advanced users, Kuailian offers rich manual configuration options. You can manually select servers in specific countries or cities, adjust encryption protocol types, and configure auto-start and auto-connect preferences. All advanced settings include clear explanatory text to help users understand each option's purpose. This "smart by default, controllable for pros" design serves diverse user needs.
5. Step 5: Continuous Background Optimization — Kuailian's technical support team monitors global server node status 24/7, regularly expanding capacity and optimizing routes. The client automatically receives backend-pushed node updates and protocol upgrades — no manual updates needed to enjoy continuously improving service quality. If issues arise, the built-in "One-Click Diagnostics" feature quickly identifies common problems and suggests solutions, with detailed tutorials available in the Help Center.

Kuailian offers flexible plan options and a reassuring refund guarantee. Here's a detailed purchasing and after-sales guide:

1. Step 1: Choose Plan Duration Based on Your Needs — Kuailian offers four plans: 7-day trial, monthly, quarterly, and annual. First-time users are encouraged to start with the 7-day trial (only ¥9.9) to fully experience all features before committing long-term. For ongoing needs, the monthly plan (¥29/month) suits short-term flexibility, the quarterly plan (¥69/quarter) balances flexibility with savings, and the annual plan (¥199/year) offers the greatest savings at roughly ¥0.55 per day — the best value for long-term users.
2. Step 2: Compare Core Benefits Across Plans — All plans include global node acceleration, smart routing, AES-256 encryption, and full platform support. Quarterly and above plans additionally include dedicated acceleration lines, while the annual plan exclusively offers multi-protocol support and 24/7 priority technical support. If you have higher network quality requirements (e.g., cross-border e-commerce, remote work), the annual plan is recommended for the most complete service experience and optimal value.
3. Step 3: Choose Payment Method and Complete Subscription — Kuailian supports multiple payment methods including Alipay, WeChat Pay, UnionPay, and international credit cards (Visa/Mastercard). All payments are processed through PCI-DSS compliant encrypted channels, ensuring your payment information remains secure. Subscription activation is immediate upon payment, and you can check remaining duration and usage records anytime in the client. Electronic invoices are available for all transactions, and enterprise users can request VAT专用发票 for reimbursement purposes.
4. Step 4: Understand the Refund Guarantee Policy — Kuailian provides a reassuring refund guarantee. First-time subscribers enjoy a 7-day no-questions-asked refund right — if you're unsatisfied within 7 days of subscribing, contact customer service for a full refund, processed back to your payment account within 3-5 business days. For subscriptions beyond 7 days, if service quality issues prevent normal usage, you may contact customer service to negotiate a prorated refund based on remaining days. User satisfaction is always our top priority.
5. Step 5: Enterprise Bulk Purchase Solutions — For team or enterprise bulk purchases, Kuailian offers dedicated enterprise plans with unified management dashboards, bulk account allocation, usage analytics, and dedicated account managers. Enterprise purchases also qualify for tiered discounts — the larger the order, the lower the unit price. Contact the enterprise sales email listed on our website or call our business cooperation hotline, and our account managers will customize a solution and complete the procurement process within one business day.

If you experience slow or unstable connections, please follow these steps to systematically troubleshoot and resolve the issue:

1. Step 1: Check Your Local Network Baseline — Before troubleshooting Kuailian, first verify your local network is functioning normally. Disconnect Kuailian and directly访问 several common websites to test baseline speed and stability. If your local network already has speed or packet loss issues, Kuailian's acceleration may be affected. Try restarting your router, moving closer to the WiFi source, or switching to a wired connection to improve baseline quality before reconnecting Kuailian for comparison testing.
2. Step 2: Manually Switch Server Nodes — While Kuailian's smart routing is efficient, occasional sudden load spikes on a particular node may cause speed degradation. Try manually selecting a different node from the server list in the client. Prioritize geographically closer nodes (typically lower latency) or nodes marked as "Dedicated Line" for higher quality. Different nodes have varying real-time load levels — trying several often quickly identifies the current optimal connection, making this the most direct and effective method for resolving temporary speed issues.
3. Step 3: Adjust Encryption Protocol Type — Different encryption protocols have varying strengths in network penetration, speed, and anti-interference capabilities. Kuailian's client supports multiple protocol switching — try changing protocol types in the settings. In regions with stricter network environments, try protocols with higher obfuscation levels. For scenarios prioritizing maximum speed, select lightweight encryption protocols to reduce computational overhead. Protocol changes require reconnection to take effect; test each protocol for 3-5 minutes to evaluate actual performance.
4. Step 4: Use the Built-in Diagnostic Tool — Kuailian's client includes a "One-Click Diagnostics" feature that automatically detects common network environment issues including DNS configuration anomalies, firewall blocks, and proxy conflicts. After running diagnostics, the system generates a detailed report with targeted resolution suggestions. For example, if DNS resolution issues are detected, the system will suggest flushing your DNS cache or changing DNS server addresses, guiding you through each step without needing to search for solutions independently.
5. Step 5: Check Device Resource Usage — If your device is simultaneously running numerous bandwidth-intensive or system-resource-heavy programs (large file downloads, video conferences, system updates, etc.), Kuailian's connection performance may be affected. Close unnecessary background applications, especially other network proxy or VPN software (running multiple network proxy tools simultaneously causes conflicts). Additionally, regularly clearing browser caches and updating Kuailian to the latest version helps maintain optimal connection status.
6. Step 6: Contact 24/7 Technical Support — If issues persist after trying the above steps, don't hesitate to contact Kuailian's official technical support team. We provide round-the-clock service 24/7. Reach us via the website's online chat, official email, or the "Contact Support"入口 in the client. When submitting, include your account information, problem description, troubleshooting steps already attempted, and diagnostic report screenshots. This helps support engineers quickly pinpoint the root cause and provide precise solutions, typically with a response time under 30 minutes.