Terms of Use

Acceptance

By installing or using the Pink Trail iOS app (“Pink Trail”, “the app”), you agree to these Terms of Use. If you do not agree, do not install or use the app.

Pink Trail is published by Danielius Studio LLC, a Wyoming limited liability company at 30 N Gould St, Suite #5280, Sheridan, WY 82801, USA (“we”, “us”).

What Pink Trail is

Pink Trail is a personal motion-artifact app for iPhone. You pick a short video from your own Photos library — a ball in flight, a bird, a thrown object — and Pink Trail runs Apple's Vision framework on-device (VNDetectTrajectoriesRequest) to extract the parabolic trajectory of the moving object. Each entry saves the trajectory polyline, the fitted parabola equation (y = ax² + bx + c), and a single middle-frame thumbnail you can revisit.

Pink Trail is not a video editor, a sports analytics service, a coaching product, or a cloud backup. The fitted parabola is a geometric approximation of the object's motion in the chosen clip and should be treated as a personal artifact, not a measurement instrument.

The app makes no network calls except to Apple's StoreKit for in-app purchases. The Vision pipeline runs entirely on-device. See the Privacy Policy for details.

Photos permission and what we do with it

Pink Trail reads only the short videos you explicitly pick through Apple's system picker. The app does not scan your broader Photos library, does not run any Vision request other than VNDetectTrajectoriesRequest, and does not analyze the contents of frames beyond detecting parabolic motion paths.

License

We grant you a personal, non-exclusive, non-transferable license to use Pink Trail on iOS devices you own or control, subject to Apple's standard App Store Licensed Application End User License Agreement (the “EULA”) which is incorporated by reference: apple.com/legal/internet-services/itunes/dev/stdeula. Where these Terms and the Apple EULA conflict, the Apple EULA controls.

Free window and subscriptions

Pink Trail is free to use for your first three trail entries lifetime, with no payment and no account.

After the third trail, you may unlock unlimited trails with one of three options: Monthly ($4/month with a 14-day introductory offer on the Monthly plan), Annual ($25/year), or Lifetime ($59 one-time). You can buy any tier at any time from the Settings screen.

All payments are processed through Apple's StoreKit and are subject to Apple's standard subscription terms, including auto-renewal. You can manage or cancel subscriptions at any time in the iOS Settings → Apple ID → Subscriptions screen.

The Lifetime tier is a one-time non-consumable purchase. It remains active for as long as Apple keeps Pink Trail available on the App Store under your Apple ID.

Acceptable use

You agree not to reverse engineer, modify, redistribute, or create derivative works of Pink Trail, except to the extent expressly permitted by applicable law. You are responsible for the videos you pick and for ensuring you have the right to use them; the app provides no editing, sharing, or publishing surface, and trails are kept locally for your own personal reflection.

Not a measurement instrument

Pink Trail estimates parabolic trajectories from the frames of a video you pick. The fitted equation is an approximation intended as a personal artifact and visual curiosity. Pink Trail is not a calibrated measurement tool and must not be relied on for sports judging, scientific measurement, ballistic analysis, or any safety-critical application.

Disclaimers

Pink Trail is provided “as is” and “as available”, without warranties of any kind, express or implied, including merchantability, fitness for a particular purpose, and non-infringement.

To the maximum extent permitted by law, Danielius Studio LLC will not be liable for any indirect, incidental, special, consequential, or punitive damages arising from your use of, or inability to use, the app.

Apple as third-party beneficiary

You acknowledge that these Terms are between you and Danielius Studio LLC, not Apple, and that Apple is not responsible for Pink Trail or its contents. Apple is a third-party beneficiary of these Terms and may enforce them against you.

Governing law

These Terms are governed by the laws of the State of Wyoming, USA, without regard to conflict-of-laws principles. Any dispute will be resolved in the state or federal courts located in Sheridan County, Wyoming, except where Apple's EULA requires otherwise.

Changes

We may update these Terms from time to time. Material changes will be reflected in the “Last updated” date at the top. Continued use of Pink Trail after a change constitutes acceptance of the new Terms.

For questions, write to dchalikovasss@gmail.com.