The TLS, DNS & HTTP inspector for Safari — see the network and security details you'd normally dig for in cURL, Web Inspector, or a CORS tester, in one click. Built-in explanations mean you don't need to already know what HSTS or CSP means.
And it watches your own connection too, from the menu bar, desktop widgets, and Control Center.
View on the Mac App StoreOne click reveals a full breakdown of the current page's connection.
See the resolved server IP address and whether the connection is IPv4 or IPv6. Copy the IP to clipboard with one tap.
View the TLS version in use (1.0–1.3) and the full certificate chain — not just the leaf — with issuer, validity, expiry, and tier labels (Leaf, Intermediate CA, Root CA, Self-signed) so you spot problems instantly. Untrusted or mismatched certificates are flagged with the reason why.
Check CSP, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, and Permissions-Policy — including policies set via HTML meta tags, not just HTTP headers — plus a full HSTS panel with max-age, subdomain coverage, and preload status.
See the site's Cross-Origin Resource Sharing policy at a glance, with risky wildcard-origin-plus-credentials configurations flagged automatically.
See whether the site is served over HTTP/1.1, HTTP/2, or the latest HTTP/3 protocol.
Identify the Autonomous System Number and internet service provider hosting the site, with RFC-accurate scope labels (Private network, Link-local, Loopback, CGNAT) for internal and homelab addresses.
DNS lookup, TCP connect, TLS handshake, and time to first byte — all measured in milliseconds.
Hover or tap-and-hold on any metric for a plain-English explanation — no need to already know what HSTS, CSP, or a TLS handshake means.
Copy a full diagnostic summary in one click — perfect for pasting into a support ticket or chat.
New in 1.5: keep an eye on your own network without opening Safari.
Live latency with a green, amber, or red health dot. Click for your hostname, public and local IPv4/IPv6 addresses (one-click copy), ISP, VPN detection, and whether you're dual stack.
Test any host by TCP connect or HTTP HEAD, set your own amber and red thresholds, and see a sparkline of recent results.
Network shows your hostname and IP addresses. Latency has a large ms figure and a Test Now button. Last Site shows the last site you inspected in Safari, with protocol, TLS, certificate expiry, and timings.
Add the NetInfo Latency control to Control Center or the menu bar. It turns green while your connection is healthy and re-tests when pressed.
NetInfo collects no personal data, never tracks your browsing, and has no servers. All connection data stays on your device. ISP lookups use the public ipapi.co API, and the menu bar and widgets find your public IP using ipify. Read the privacy policy.
Get help, share feedback, and follow NetInfo updates on our Discord server.
Join Discord (opens in a new window)Launch the NetInfo app, then open Safari → Settings → Extensions and enable NetInfo. You may also need to go to Safari → Develop → Allow Unsigned Extensions if using a development build.
Right-click the Safari toolbar → Customise Toolbar, then drag the NetInfo icon into the toolbar.
DNS, TCP and TLS timings are only available on fresh connections. If Safari reuses an existing connection to the server, these values will not be available. Try refreshing the page.
NetInfo works on all HTTPS and HTTP websites. Certificate and TLS details are only available on HTTPS sites.
NetInfo requires macOS 14.6 Sonoma or later. The Control Center control requires macOS 26 or later.
For widgets, right-click the desktop → Edit Widgets and search for NetInfo. For the control, open Control Center → Edit Controls and search for NetInfo Latency. Resize the control to show the latency in milliseconds.
Click the NetInfo item in the menu bar, then the gear → Settings. You can add or remove endpoints, change how often they're tested, turn on Launch at Login, or turn the menu bar item off.