Privacy Policy

Last Updated: January 26, 2026

1. Introduction

This Privacy Policy explains how Ballistics.rs and the ballistics-engine software collect, use, and protect your data. We are committed to transparency about our data practices.

2. Local Software (No Data Collection)

Privacy by Default: When using the ballistics-engine CLI without the --online flag, no data is collected or transmitted. All calculations happen locally on your device.

The open source ballistics-engine library and CLI perform all physics calculations locally. No network connections are made, no data is sent anywhere, and no information about your usage is collected.

3. Online Service Data Collection

When you explicitly opt-in by using the --online flag, your calculation requests are sent to our cloud API. This section details exactly what data is collected.

3.1 Data Collected

The following data is automatically logged when you make an online API request:

Trajectory Parameters

Parameter	Example
Ballistic coefficient (value and type)	0.27, G7
Bullet mass	140 grains
Bullet diameter	0.264 inches
Muzzle velocity	2875 fps
Target distance	1000 yards
Zero distance	100 yards
Wind speed and direction	5 mph, 90 degrees
Temperature	32 F
Pressure	27.29 inHg
Humidity	45%
Altitude	2506 feet
Latitude/Longitude (if provided)	36.6, -115.2
Weather model settings	enable_weather_zones, wind_shear_model

Technical Data

Data	Example
IP Address	71.34.16.147
Client Version (User Agent)	ballistics-cli/0.13.25
Timestamp	2026-01-26T18:29:59Z
Request latency	343ms
Response status	200 OK

3.2 How Data Is Used

Your data is used solely for service delivery:

Processing your trajectory calculation request
Returning the calculated results to your client
Maintaining operational logs for debugging and service reliability

We do NOT use your data for:

Training or improving machine learning models
Sharing with third parties
Marketing or advertising
Building user profiles
Any purpose other than delivering your calculation

3.3 Data Retention

Request logs are retained for 30 days and are then automatically deleted by Google Cloud Platform's log lifecycle management. We do not maintain any permanent database of your trajectory calculations.

3.4 Data Location and Security

The online service is hosted on Google Cloud Platform (Google Cloud Run) in the United States. All data is transmitted over HTTPS encryption. Our infrastructure is subject to Google Cloud's security measures and certifications.

4. Opting Out

You have complete control over whether any data is sent to our servers:

Don't use --online: Simply omit the flag to use only local calculations
Build without online feature: cargo install ballistics-engine --no-default-features

The local physics solver provides accurate trajectory calculations without any network communication.

5. Third-Party Services

Our online service uses the following third-party infrastructure:

Google Cloud Platform: Cloud Run hosting and Cloud Logging

We do not use any third-party analytics, advertising, or tracking services in our API.

6. Your Rights

You have the right to:

Choose not to use the online service
Request information about data we may have logged (within the 30-day retention period)
Contact us with privacy concerns

7. Changes to This Policy

We may update this Privacy Policy from time to time. We will note the date of the last update at the top of this page.

8. Contact

For privacy-related questions or concerns, contact us at:

Email: email@tinycomputers.io
Website: tinycomputers.io

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