Earlier platform concepts

Earlier ideas for phones and sensors.

We explored how phones, wearables and fixed sensors might share information. None of these ideas is a working safety service.

We're now developing a small device you can clip on. See the current design.

See what we're developing → See the separate game →

What existed or was proposed

The game is separate from the sensor ideas.

Tripwire Recon

Separate free game

Tripwire Recon does not include radar, check-in alerts or safety coverage.

Wearable

We considered a device that could sense heart rhythm, movement and surroundings. It does not exist as a usable safety feature.

Fixed nodes

We considered sensors for places phones might miss. None have been deployed as a product.

Earlier plan

What we had planned to test.

01 · Notice

Test phone sensors

We considered movement, sound and location as possible inputs. Playing the game is not consent to a safety service.

02 · Share

Test links between devices

Our timing method might help nearby devices communicate. It still needs field testing, especially where cellular service is poor.

03 · Alert

Test missed-arrival alerts

We considered a message to a trusted contact after a missed arrival. This feature is not available.

Earlier audiences

Who we had in mind.

People and families

  • Tripwire Recon is a separate game, not a safety service.
  • Walk-Home Radar and related check-in ideas are not available.
  • Any future check-in feature would need a clear privacy review.

Campuses and employers

  • A future test would need voluntary consent and clear privacy limits.
  • We have no campus deployment or dashboard to offer.

Other partners

  • Outdoor sensing would need range and coverage tests. We have no off-grid safety service.
  • We have not announced partner agreements for the earlier network ideas.
  • Contact us with questions.

See what we're developing now.

The proposed device is separate from the ideas described on this page.

See the current design → Get product updates →