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Slipstream

Race a ghost of any run, by anyone. Upload a GPX, share a link, and find out if you're faster.

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The Problem

Runners want something to chase. Training alone means there's nothing to race against.

Whether you're a runner, cyclist, or swimmer, your best performances happen when there's something to chase. A training partner, a rival, a record. But finding someone to compete with at the right time, at the right level? That's rarely possible when you're heading out alone.

Slipstream solves this. Upload a GPX from any Garmin run, share a link, and race the ghost of that run on your next effort. The competition is always there, whenever you are.

How It Works

01

Export your run

Download a GPX file from Garmin Connect on your desktop. Any run, any distance.

02

Upload to Slipstream

Open Slipstream on your phone and upload the file. It pulls the pace data and creates a ghost.

03

Share the link

Slipstream gives you a URL. Send it to yourself or anyone else via iMessage, WhatsApp, or wherever.

04

Race it

Open the link, hit start, and run. One indicator tells you whether you're ahead of the ghost or behind. That's it.

See It In Action

Demo video coming soon

In the meantime, try the live app below

Build Stages

Stage 1

Concept

Defined the core problem and validated that ghost-racing was the right mechanic to solve it.

Stage 2

MVP / Prototype

Built the first working version, GPS tracking, ghost recording, and basic run comparison.

Stage 3, Now

Core Loop Built

Live GPS tracking, ghost racing, real-time position indicator, and run summary are all working. Iterating on the prototype and preparing for select-group testing.

Stage 4, Decision pending

Pivot assessment

The core loop is built and works. The original north star, live GPS multiplayer, is technically achievable but complex to build for uncertain near-term benefit. Currently assessing whether a simpler model, racing real people's real recorded routes, is the right place to focus. The decision will be documented here either way.

What's Next

  • Complete the pivot assessment, simpler recorded-route model vs the original live multiplayer ambition
  • Document the decision clearly, whatever it is
  • If continuing, release to a small select group of runners for first real-world feedback before building further