New · Just Run

Treadmill
Smart Speed

Your treadmill already knows how fast you’re running. This tells Zwift — no foot pod, no calibration, no sensor taped to your shoe.

Download on the App Store Get it on Google Play

Treadmill Smart Speed connected, showing 8.0 mph, a 7:30 per mile pace, six speed presets in two rows and 2% incline

Just Run: a runner in an orange top on a park path, 12:42 into a run at 6.2 mph, 1.32 miles estimated at a 9:40 per mile pace, with the speed buttons and presets below

Just past the first mile in Just Run: a “1 mi, split 09:38” banner above the runner and confetti on the path

Just Run’s list of all runs, newest first, each with its date, time, pace and distance in miles; one is marked “free run ended”

The summary of a 3.13-mile run: 30 minutes, a 9:35 per mile pace and 6.3 mph on average, a box to match the treadmill’s distance, and an Export TCX file button

Treadmill Smart Speed showing 5.6 mph and a 10:42 per mile pace, with the speed source reading “Apple Watch · receiving”

Treadmill Smart Speed showing 5.6 mph and a 10:42 per mile pace, with the speed source reading “Arm band · estimating”

The “Getting connected” help sheet: start pairing in Zwift, look for this iPhone by its own name, wait for the pill to turn green, then where the speed comes from

“Thanks for buying the original”: a purchase of the old paid app covers everything in this version, for life

Treadmill Smart Speed on Android showing 10.0 km/h and a 6:00 per km pace, six speed presets in two rows and 2% incline

Treadmill Smart Speed on Android reading a Bluetooth treadmill: 10.4 km/h, a 5:46 per km pace and 2% incline, with the source reading “Treadmill · Home Treadmill”

Just Run on Android: a runner on a park path, 12:41 into a run at 10.0 km/h, 2.12 km estimated at a 6:00 per km pace

Set your speed, and Zwift sees it

What it does

Treadmill Smart Speed sends your running speed to any app that reads a standard Bluetooth foot pod. It speaks the same protocol the expensive sensors do, so as far as Zwift is concerned you are wearing one.

Give it your speed by hand to match the treadmill, which is the most accurate, or let it read a treadmill that already talks Bluetooth. On iPhone, the phone’s motion sensor or an Apple Watch can estimate it instead, which saves you a step at the cost of some precision.

It also broadcasts incline, which Zwift picks up when the gradient is above zero. On iPhone, the Apple Watch app sends your heart rate to Zwift too.

No app to send the speed to? Just Run, the last choice on the speed source list, records the run on the phone alone. Set the speed to match the treadmill and run through a 3D park, as a man or a woman, with a gate, your split and a burst of confetti at every kilometre or mile. The last 50 runs are kept on the phone with their time, distance and pace. The distance is worked out from the speed you set, so you can match it to the treadmill’s display afterwards, then export the run as a TCX file to share or save.

Setting it up with Zwift

Open Treadmill Smart Speed on your phone.
Start Zwift on your other device.
In Zwift, go to the run pairing screen.
Pair with your phone. Zwift lists it under the phone’s own Bluetooth name, not the app’s.
Start running.
Match the speed in the app to your treadmill’s speed.

The details

PlatformiPhone and Android phones, with an Apple Watch app. The iPhone app runs on iPad, but is not designed for it.
RequiresiOS 17.0 or later
Apple Watch requireswatchOS 9.0 or later
Android requiresAndroid 14 or later
Works withZwift, and anything that reads a Bluetooth foot pod
Just RunRecords a treadmill run on the phone alone, with nothing to connect. Keeps the last 50 runs and exports them as TCX files.
AccountNone. There is no sign-in.
StatusLive

Treadmill
Smart Speed

Setting it up with Zwift

TKD Guide

TKD Quiz

Up the Ranks

TreadmillSmart Speed

Setting it up with Zwift

TKD Guide

TKD Quiz

Up the Ranks

Treadmill
Smart Speed