On the AppStore

latency for iOS turns your iPhone into a real network instrument. Point it at any host or IP and track your connectivity: round-trip times, jitter and loss, a live traceroute drawn hop by hop on a 3D map, and a plain-English verdict on whether a service is actually down or it is just you.

It runs entirely on-device for the network tools and all intelligence features can be toggled off at any time. No account, no sign-in, free.

Download Latency on the AppStore

Modes of operation

Ping

An ICMP ping tool with a live round-trip chart, per-ping log, and running jitter and loss.

• Fixed or continuous sessions: ping a set number of times, or keep going until you stop.
• Configurable count, delay between pings, timeout, and packet size.
• Haptics on start, finish, and timeouts, so you can feel a flaky link without watching the screen.

Traceroute

A visual traceroute drawn live on a 3D map, hop by hop, with numbered pins. It shows exactly where a route slows down or dies, so you can tell your own network from your ISP from something out on the wider internet.

Reachability

One tap runs a staged diagnosis and returns a clear verdict instead of a shrug:

1. Network interface up and usable
2. DNS resolves the name
3. ICMP reaches the host
4. Port 443 accepts a connection
5. A real HTTPS request gets a response

A slow server, a blocked port, or filtered ICMP each show up as a distinct result, so you know which layer is failing.

Latency Intelligence

Context around whatever you are looking at:

• Geolocation for the target and every traceroute hop, placed on the map.
• Network operator (ASN) at a glance: who actually runs the host.
• Trending incidents for major services, and the ability to report an issue yourself.

Widgets

A home and lock screen widget quietly pings a target you choose and shows its latest round-trip time, so a favorite server is one glance away. Bookmarks, history, and a search box that resolves as you type round out day-to-day use.

Reading the numbers

The ping screen reports round-trip time plus three measures of how consistent that time is. They are easy to confuse, so:

Metric	What it means
RTT	Round-trip time: how long one ping takes to go out and come back. Lower is better.
Jitter	Volatility between consecutive pings, the average size of the change from one ping to the next. Low jitter means a steady connection.
Std dev	The overall spread of every sample around the average RTT. It captures general inconsistency across the whole session.
Loss	The percentage of pings that never got a reply.

Jitter vs. Standard Deviation (std dev)

Both describe variability, but not the same way. Jitter is point-to-point: it reacts to how much each ping differs from the one just before it, which is what hurts real-time traffic like calls and games. Std dev is a whole-session figure: it measures how far samples sit from the average overall.

A link can look calm on average yet spike every few seconds. That periodic spike shows up strongly in jitter while barely moving a low std dev, which is exactly why the app shows both.

Alerts

Coming soon

Push notifications when a target you have saved goes down, delivered straight to your device. Like the rest of the app it needs no account: alerts are an in-app purchase tied to your device, so you get a heads-up on your phone without signing up for anything.