Your body, in real time.

What it does

• Connect your OBU

  Pair the Onboard Unit in your washable V2K shirt over Bluetooth and start capturing straight away.

• Accurate body data

  Sensors embedded in the textile record your training metrics — no traditional chest strap, no hassle.

• Session management

  Start and end training sessions in the app so everything is recorded from the moment you begin.

• Train in the right zones

  Use accurate heart rate and vital data to keep training intensity matched to your goals.

• Visualize your performance

  Weekly, monthly and yearly overviews turn each session into clear, readable charts.

• Track your history

  A full log of past sessions, so you can watch recovery patterns and progress over months and years.

Android calls this “installing from an unknown source.” It's a supported, built-in flow — you're just telling the phone you trust this file.

1. 1

   Download the APK

   Tap Download APK. Your browser may warn that this kind of file can harm your device — that message appears for anything downloaded outside the Play Store. It's safe to keep.

2. 2

   Allow installs from your browser

   Open Settings → Apps → Special access → Install unknown apps (on some phones, Settings → Security). Pick the browser you downloaded with and turn on “Allow from this source.”

3. 3

   Open the file

   Tap V2K.apk from your notification shade or your Downloads folder to start the installer.

4. 4

   Approve the install

   Android may say “Play Protect doesn't recognize this developer.” Tap Install anyway — this appears for every app not yet on the Play Store and doesn't mean anything is wrong.

5. 5

   Open V2K

   Launch the app, pair your sensor over Bluetooth, and you're ready to record.

For support or feedback, reach out to us at support@v2kgear.com

Everything V2K can ask your device for, in full. Android requests each one in context, when the feature that needs it runs — so you can decline anything your setup doesn't use.

• Location

  • Approximate location (network-based)
  • Precise location (GPS and network-based)

• Photos / Media / Files

  • Read the contents of your USB storage
  • Modify or delete the contents of your USB storage

• Storage

  • Read the contents of your USB storage
  • Modify or delete the contents of your USB storage

• Camera

  • Take pictures and videos

• Wi-Fi connection information

  • View Wi-Fi connections

• Other

  • View network connections
  • Pair with Bluetooth devices
  • Access Bluetooth settings
  • Full network access
  • Control Near Field Communication
  • Run at startup
  • Draw over other apps
  • Control vibration
  • Prevent device from sleeping

Questions

Is it safe to install this way?

Yes. Sideloading is Android's supported way to install apps from outside the Play Store. The warnings you'll see are generic and appear for every non-store app.

Why isn't it on the Play Store yet?

We're finishing store review. This page is how invited testers and clients get access in the meantime; it'll move to the stores once approved.

Do I need the V2K shirt?

The app pairs with the V2K smart textile (and its OBU) to record your training data. You can explore the interface without one, but live readings need the hardware.

Which devices are supported?

Android 12 and newer with Bluetooth, on phone or tablet. An iOS build is coming too.

Why does it ask for so many permissions?

Bluetooth and location are what Android requires to find and pair your OBU; The rest are requested only where a feature needs them. Android asks in context, and you can decline anything you don't use.

How do I update later?

We'll email you when a new build is ready. Download and install it over the current one — your recordings stay in place.