Mozilla TLS Scanner Pricing: Cost-Free Security Analysis (2026)

Pricing overview

The Mozilla TLS Scanner, known formally as the Mozilla TLS Observatory, is provided as a free public service by Mozilla. Its primary objective is to enhance internet security by enabling server administrators and developers to easily check their server-side Transport Layer Security (TLS) configurations against established best practices and Mozilla's own security guidelines for server-side TLS. This service incurs no direct costs for users, distinguishing it from many commercial security scanning solutions.

There are no hidden fees, licensing costs, or usage-based charges associated with utilizing the Mozilla TLS Observatory. The tool is accessible directly via a web interface, requiring no account creation or subscription. This open-source-aligned approach reflects Mozilla's broader mission to promote an open, secure, and accessible internet. Users can submit domains for analysis and receive detailed reports on certificate chains, supported protocols, ciphers, and potential vulnerabilities without any financial commitment. The underlying infrastructure and development are supported by Mozilla's operational budget and community contributions, rather than direct user fees for the scanning service itself.

Plans and tiers

The Mozilla TLS Scanner operates under a single, unified offering: a free-to-use public service. There are no distinctions between different plans, no premium tiers, and no tiered access levels based on payment. All users receive the same level of service and access to all available features through the web interface. This model contrasts with many commercial alternatives that often segment their offerings into basic, standard, and enterprise plans, each with varying capabilities, support levels, and pricing structures.

The absence of tiered plans means that all functionality, including detailed reports on TLS versions, cipher suites, key exchange mechanisms, certificate validity, and potential misconfigurations, is universally available. This simplifies user experience by removing the need to compare feature sets or anticipate future costs for advanced capabilities. The focus remains on providing a consistent and robust TLS scanning service to all internet users, regardless of their budget or organizational size. This singular approach underscores Mozilla's commitment to broad accessibility for security tools.

Free tier and limits

The entire Mozilla TLS Scanner offering functions as a free tier, providing unrestricted access to its core scanning capabilities. Users can submit any public domain for analysis without incurring charges or requiring registration. This comprehensive free access includes detailed reports that cover various aspects of TLS configuration, such as the cryptographic protocols supported (e.g., TLS 1.2, TLS 1.3), the strength of accepted cipher suites, the integrity of the certificate chain, and the presence of common vulnerabilities or misconfigurations. The service aims to align server configurations with current TLS standards and best practices, as outlined by organizations like the IETF.

While there are no explicit hard limits on the number of scans a single user can perform, the service operates under an implicit fair use policy. This policy is designed to prevent abuse and ensure equitable access for all users. Excessive or automated scanning from a single IP address within a short timeframe might lead to temporary rate limiting or IP blocking to maintain service stability and availability. However, for typical individual or organizational use, performing scans for legitimate security assessments, these limits are rarely encountered. The tool is intended for interactive use rather than large-scale automated data collection. Mozilla does not publicly disclose specific rate limits, but consistent and responsible use is encouraged to ensure continued access to the free service.

Real-world cost examples

Given that the Mozilla TLS Scanner is a free service, all real-world cost examples for its direct use converge to zero. There are no scenarios where a user would incur charges for scanning a domain through the Mozilla TLS Observatory web interface. This stands in stark contrast to commercial security services where costs can vary significantly based on subscription tiers, number of scans, frequency, additional features like continuous monitoring, or API access.

• Small Business Website Security Check: A small business needing to verify its website's TLS configuration after a server update can use the Mozilla TLS Scanner to perform a full analysis. The cost for this essential security check is $0.
• Developer Testing a New Deployment: A developer deploying a new web application and wanting to ensure its TLS setup adheres to modern standards can run multiple scans throughout the development and staging phases. Each scan, providing immediate feedback on configuration changes, costs $0.
• IT Administrator Annual Audit: An IT administrator conducting an annual audit of all public-facing company domains to ensure ongoing TLS compliance can utilize the scanner for each domain. The cumulative cost for auditing multiple domains over the year remains $0.
• Educational Purposes: Students or educators learning about network security and TLS can use the tool to analyze various public websites to understand different configurations and their implications. All educational use is performed at no charge.

The only potential indirect costs might involve the time taken by personnel to interpret the scan results and implement necessary changes to their server configurations. However, the tool itself provides actionable insights, reducing the effort required to identify issues. Furthermore, any costs associated with the server infrastructure or bandwidth used to access the web interface would be negligible and absorbed within standard internet access fees, not specific to the Mozilla service.

How the pricing compares

When comparing the pricing of the Mozilla TLS Scanner to its alternatives, it stands out due to its completely free model. Most comparable services in the TLS/SSL analysis and monitoring category adopt a freemium or subscription-based pricing structure, offering more advanced features, higher scan volumes, or API access at a cost.

The Mozilla TLS Scanner distinguishes itself by focusing solely on providing a high-quality, free, web-based tool for server-side TLS configuration assessment. While alternatives like Hardenize offer continuous monitoring and broader security insights at a cost, and ImmuniWeb integrates its scan into comprehensive commercial security services, Mozilla maintains its stance as a public utility. Qualys SSL Labs is perhaps the closest direct competitor in terms of a free, public web-based TLS scanner, often used in conjunction with the Mozilla tool for a multi-perspective assessment. The choice between these tools often depends on whether a user requires basic, on-demand checks (where Mozilla excels at no cost) or desires advanced features like API access, automated monitoring, and broader security posture management, which typically come with a subscription fee from commercial providers.