NetJolt docs: network tools and what they do

Captive-portal detective Coming soonAvailable now

Tells you whether you are online or stuck behind a hotel, airport or cafe login page. Shows the portal URL and redirect chain, opens the login page, and re-checks when you close it.

When to use it

Hotel wifi won't connect, the airport wifi login page does not appear, or wifi says connected but there is no internet.

macOS

Yes

iOS / iPadOS

Coming soon (not yet in the released iOS app)

Android

Coming soon (not yet in the released Android app)

Good to know

Three public plain-HTTP probes with a 2-of-3 vote. The login page opens in the system browser view, never an embedded web view.

Read the full captive-portal detective guide →

Who's on My WiFi and new-device alerts Coming soonAvailable now

A roster of devices on your network with names, manufacturers and first/last seen, plus a notification when something new joins.

When to use it

You want to know who is connected to your wifi, or you found an unknown device on your network.

macOS

Yes (needs the optional scan helper)

iOS / iPadOS

Coming soon (not yet in the released iOS app)

Android

Coming soon (not yet in the released Android app)

Good to know

Devices whose hardware address is hidden by the OS appear in the roster but never trigger alerts.

Read the full who's on my wifi and new-device alerts guide →

AI-assisted network diagnosis Coming soonAvailable now

A Why is my network bad? button that gathers the signals NetJolt already measures (latency, loss, signal, channel congestion, DNS) and returns a plain-English diagnosis with prioritised fixes.

When to use it

Why is my wifi slow? Why is my video call bad?

macOS

Yes

iOS / iPadOS

Coming soon (not yet in the released iOS app)

Android

Coming soon (not yet in the released Android app)

Good to know

Three paths: your own OpenAI-compatible endpoint (you supply the URL and key, stored in the system keychain), a Share for analysis button that builds a prompt you can paste into ChatGPT or Claude, or an offline rules engine that needs no network. Nothing is sent until you tap a button. The snapshot leaves out your public IP, SSID/BSSID, hostnames, MAC addresses and other devices.

MTR (continuous traceroute) Coming soonAvailable now

Traceroute that keeps running: every hop on the path gets a ping each second, with live loss and latency per hop.

When to use it

Packet loss or lag that only shows up sometimes, and you need to see which hop is responsible.

macOS

Yes

iOS / iPadOS

Coming soon (not yet in the released iOS app)

Android

Coming soon (not yet in the released Android app)

Good to know

Loss is cumulative since the run started, like the classic mtr tool.

WHOIS / RDAP lookup Coming soonAvailable now

Look up who registered a domain or IP: registrar, created/expires dates, nameservers, status, abuse contact, and for IPs the network name, CIDR and ASN.

When to use it

Checking when a domain expires, who owns an IP address, or where to send an abuse report.

macOS

Yes (RDAP, with WHOIS text fallback)

iOS / iPadOS

Coming soon (not yet in the released iOS app)

Android

Coming soon (not yet in the released Android app)

Good to know

RDAP is the modern, structured replacement for WHOIS. macOS can also fall back to the system whois command.

TLS certificate inspector Coming soonAvailable now

Shows a host's full certificate chain: subject, issuer, validity dates and days to expiry, alternative names, key and signature algorithm, TLS version and cipher suite.

When to use it

Checking that a certificate is valid, finding out when it expires, or debugging a self-signed or expired certificate. Works on non-HTTP ports too.

macOS

Yes

iOS / iPadOS

Coming soon (not yet in the released iOS app)

Android

Coming soon (not yet in the released Android app)

Good to know

Warns amber within 30 days of expiry and red once expired.

Subnet / IP calculator Coming soonAvailable now

Enter an IPv4 address and prefix to get the network and broadcast address, usable host range and count, wildcard mask and supernet. Fully offline.

When to use it

Planning or checking a subnet.

macOS

Yes

iOS / iPadOS

Coming soon (not yet in the released iOS app)

Android

Coming soon (not yet in the released Android app)

NTP time-sync check Coming soonAvailable now

Measures your clock offset and round-trip delay against NTP servers such as time.apple.com, pool.ntp.org and time.google.com.

When to use it

Logins, certificates or sync failing because the clock is wrong.

macOS

Yes

iOS / iPadOS

Coming soon (not yet in the released iOS app)

Android

Coming soon (not yet in the released Android app)

Good to know

A one-shot diagnostic, not a time daemon.

HTTP header inspector Coming soonAvailable now

Makes one request and shows the status, every redirect, response headers and a timing breakdown. GET by default, HEAD optional, up to 10 redirects.

When to use it

Debugging redirects, caching headers or slow first byte.

macOS

Yes

iOS / iPadOS

Coming soon (not yet in the released iOS app)

Android

Coming soon (not yet in the released Android app)

Good to know

Separate from HTTP Latency, which samples repeatedly over time.

IPv6 parity Coming soonAvailable now

An Auto / IPv4 / IPv6 toggle on ping, traceroute and DNS so you can tell whether a problem affects only one address family.

When to use it

A site loads over one family but not the other.

macOS

Yes

iOS / iPadOS

Coming soon (not yet in the released iOS app)

Android

Coming soon (not yet in the released Android app)

Good to know

Auto prefers an IPv6 address when one exists.

ARP table viewer Coming soonAvailable now

Reads the system's existing ARP / neighbor cache and lists IP, MAC, manufacturer, interface and state, flagging incomplete entries and possible duplicate MACs.

When to use it

Seeing what your machine already knows about the local network, or investigating a duplicate address.

macOS

Yes

iOS / iPadOS

No

Android

Coming soon (not yet in the released Android app)

Good to know

A passive read. Duplicate MACs are shown as a hint, not as spoofing detection.

SNMP browser Coming soonAvailable now

Walk a device's SNMPv2c tree from a host in the Network Scanner: names, uptime and interface tables. Read-only.

When to use it

Inspecting a switch, router, printer or NAS that speaks SNMP.

macOS

Yes

iOS / iPadOS

No

Android

No

Good to know

The community string is held in memory only and never stored.

Per-process bandwidth Coming soonAvailable now

Live per-application network usage, updated every second.

When to use it

Finding out which app is eating your bandwidth.

macOS

Yes (macOS direct download)

iOS / iPadOS

No

Android

No

Packet capture Coming soonAvailable now

Live capture on a chosen interface with presets (all traffic, ARP, DNS, this host), pause, a drop counter, and export to a .pcap file for Wireshark.

When to use it

When you need to see the packets themselves.

macOS

Yes (macOS direct download; needs the scan helper)

iOS / iPadOS

No

Android

No

Advanced scans: SYN, ICMP and OS fingerprint Coming soonAvailable now

Raw-packet scans that find hosts and open ports more thoroughly than a standard scan, and guess device operating systems.

When to use it

A standard scan misses hosts or ports.

macOS

Yes (needs the scan helper)

iOS / iPadOS

No

Android

No

Good to know

Sending raw packets needs root, so macOS asks you once to approve the NetJolt scan helper.

Health timeline, trends and alerts Coming soonAvailable now

A scrollable history of connection changes, ping, speed tests and call-quality results with 30 days of history, rule-based trend detection and alerts.

When to use it

Working out when a problem started and whether it is getting worse.

macOS

Yes

iOS / iPadOS

Coming soon (not yet in the released iOS app)

Android

Coming soon (not yet in the released Android app)

Good to know

Fixed rules over rolling windows, not machine learning.