TETHRDPACE
You never run alone

Your people.Your pace.

Every race becomes a tethrd experience — voice drops from your crew at every mile, an AI pacer that reads your run, and live cheers from the people running with you in spirit.

Get early accessHear a voice drop
5:42/mi
AI-paced, in real time
12
crew cheering you on
9:41● ▬ ▮
● Live · Mile 18Chicago Marathon
5:42
min / mi
On pace
M
Maya · Mile 18
"You've got this"
How it works

Three steps to a race that carries your people with you.

01

Build your crew

Invite the people whose voice you'd want at mile 20. Family, coach, running club — up to twelve.

02

They record a drop

Short voice notes tagged to a mile, a split, or a moment. The wall gets softer when it's your best friend or family on the other side.

03

Run tethrd

Voice drops unlock at each mile. Cheers land on your wrist or in your ear. You are never out there alone.

Voice drops

Their voice, exactly when the wall hits.

Your crew records short messages ahead of time. Each one unlocks at the mile you assign — so mile 20 comes with your best friend telling you to hold on.

Schedule drops by mile, split, or heart-rate zone
Auto-mixed under your music, never jarring
Surprise drops your crew can send mid-race
Drop timeline · 26.2
MI 5
Dad — "Settle in, you trained for this"
MI 13
Coach — "Halfway. Bank nothing, stay smooth"
MI 20
Maya — "This is your mile. Go."
MI 26
The whole crew — cheering you home

The whole run, tethrd to the people who matter.

Four ways you stay connected
▮▮

Voice drops

Pre-recorded messages from your crew unlock at every mile marker. Their voice, exactly when you need it.

AI pacer

Reads your effort in real time and nudges your pace — negative splits without the mental math.

Live cheers

Your people follow along and send bursts of encouragement that land on your wrist mid-stride.

Training plans

Build to race day with plans that adapt to your weeks — and keep your crew in the loop the whole way.

+9
"At mile 23 my sister's voice came through. I forgot my legs. I just ran. That's the whole thing — they were with me."
Priya R. · Chicago Marathon, 3:58 PR

Run your next race tethrd.

Get early access and bring your people with you at every mile.

Get early access