TLS Check
TLS Check is an open-source Firefox WebExtension that performs TLS and HTTP security analysis locally for visited HTTPS pages. It helps users inspect transport security and related HTTP protections directly in the browser.
Overview
5 featuresTLS Check is a Browser DevTools & extensions project. It focuses on checking the TLS configuration and HTTP security of HTTPS pages without sending analysis data to a remote service. TLS Check is an open-source project aimed at privacy-conscious web users and security professionals. TLS Check is open source under the Open Source license. It runs on the web and embeddable surfaces.
Behind TLS Check is sagittarius-a, and it first shipped in 2026. Among its 5 catalogued features are TLS analysis, HTTP analysis, and local processing.
Summary written by a language model from the project’s public pages.
- TLS analysis
- HTTP analysis
- Local processing
- HTTPS inspection
- Firefox integration
Built with & integrations
Trust & compliance
Indexing history
1What PulseGate has recorded for this listing
Frequently asked questions about TLS Check
- What is TLS Check?
- TLS Check focuses on checking the TLS configuration and HTTP security of HTTPS pages without sending analysis data to a remote service. It is catalogued under Browser DevTools & extensions on PulseGate.
- Who should use TLS Check?
- TLS Check is an open-source project built for privacy-conscious web users and security professionals.
- Does TLS Check have a free plan?
- Yes — TLS Check is open source under the Open Source license and free to use.
- What platforms does TLS Check run on?
- TLS Check runs on the web and embeddable surfaces.
- Is TLS Check still maintained?
- Unverified. TLS Check has not been re-checked since it entered the index, so there is no finding either way — and only a positive finding would say otherwise.
- What are alternatives to TLS Check?
- Similar projects tracked by PulseGate include HTTPS+ Checker, TLS Lens, and IndicateTLS.HTTPS+ CheckerTLS LensIndicateTLS
- Who develops TLS Check?
- TLS Check is developed by sagittarius-a.
- When did TLS Check launch?
- TLS Check first shipped in 2026.
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