← Back to Home

TENNAI Privacy Policy

Last Updated: 02.12.2025

1. Introduction

TENNAI ("we", "our", "us") respects your privacy and is committed to protecting your personal data. This Privacy Policy explains how we collect, use, store, and protect information about you when using our mobile application and web service TENNAI (Tennis Technique Analysis Assistant).

By using our services, you agree to the terms of this Privacy Policy.

2. Information We Collect

2.1. Video Files

We collect video files that you upload to the application for tennis stroke technique analysis:

• Videos of your tennis strokes (forehand, backhand, serve)
• Formats: MP4, AVI, MOV
• Maximum file size: 100 MB

Important: Video files may contain images of you and other people present in the frame. By uploading videos, you confirm that you have the right to use such images and the consent of all persons depicted in the video.

2.2. Analysis Results

We save the results of your stroke analysis, including:

• Calculated KPIs (Key Performance Indicators)
• Comparison with ATP reference values
• Personalized recommendations for technique improvement
• Analysis metadata (analysis date, stroke type, processing time)

2.3. Application Usage Data (Firebase Analytics)

When using the mobile application, we automatically collect the following data through Firebase SDK:

Application Events:

• Video upload
• Analysis start
• Viewing analysis results
• Viewing recommendations
• Video deletion
• Other actions in the application

Technical Data:

• Device type and operating system
• Application version
• Device identifier (Device ID)
• Application usage time
• Feature usage frequency

Important: Firebase Analytics uses anonymized data and does not collect personal information that directly identifies you.

2.4. Technical Data

We automatically collect technical information to ensure service operation:

• Unique video identifier (video_id)
• Operation timestamps
• Error logs (if technical issues occur)
• Service performance data

3. How We Use Collected Information

3.1. Primary Use Purposes

We use the collected information for the following purposes:

1. Stroke Technique Analysis:

• Processing uploaded video files
• Calculating KPIs and comparing with reference values
• Generating personalized recommendations

2. Service Improvement:

• Analyzing application usage data (Firebase Analytics)
• Identifying problems and errors
• Performance optimization
• Developing new features

3. Technical Support:

• Resolving technical issues
• Processing user requests
• Ensuring service security

4. Data Storage

4.1. Storage Location

Your data is stored on Google Cloud Platform (GCP) servers:

• Data may be stored in various regions depending on configuration

4.2. Storage Security

We apply the following security measures:

• Data encryption during transmission (HTTPS/TLS)
• Role-based access control
• Regular security updates
• Monitoring for unauthorized access

5. Data Sharing with Third Parties

5.1. Google Cloud Platform

We use Google Cloud Platform services for data storage and processing:

• Google Cloud Storage — file storage
• Cloud Run — request processing
• Firebase — analytics and monitoring

Data is transferred in accordance with Google's Privacy Policy and GCP Terms of Use.

5.2. Firebase Analytics

Firebase Analytics collects anonymized data about application usage. This data is used:

• To analyze application feature usage
• To improve user experience
• To identify technical issues

Firebase Analytics does not transfer data that personally identifies you.

5.3. Other Third Parties

We do not sell or transfer your personal data to third parties for marketing purposes.

We may disclose your data only in the following cases:

• As required by law or court order
• To protect our rights and security
• In case of merger, acquisition, or asset sale (with user notification)

6. Your Rights

6.1. Data Management in the Application

You can manage your data directly in the application:

• View uploaded videos
• View analysis results
• Delete videos and associated data

6.2. Disabling Analytics

You can disable analytics data collection through your device settings:

• iOS: Settings → Privacy → Analytics → Disable "Share iPhone Analytics"
• Android: Settings → Google → Ads → Disable ad personalization

Please note that disabling analytics may affect our ability to improve the application.

7. Children's Data Protection

Our services are not intended for children under 13 years of age (or 16 years in the EU). We do not knowingly collect personal data from children without parental or guardian consent.

If you are a parent or guardian and believe your child has provided us with personal data, please contact us to delete such information.

8. International Data Transfer

Your data may be processed and stored on servers located outside your country of residence. By using our services, you agree to the transfer of your data to other countries, including but not limited to the United States (where Google Cloud Platform servers are located).

We ensure that such data transfer complies with applicable personal data protection legislation.

9. Changes to Privacy Policy

We may periodically update this Privacy Policy. We will notify you of significant changes:

• Through in-app notification
• By email (if you provided an address)
• By publishing an updated version on our website

The last update date is indicated at the beginning of the document. We recommend periodically reviewing this Privacy Policy.

10. Data Security

We apply reasonable technical and organizational measures to protect your data from unauthorized access, alteration, disclosure, or destruction:

• Data encryption during transmission
• Role-based access control
• Regular security audits
• Monitoring for suspicious activity

However, no method of data transmission over the Internet or electronic storage method is 100% secure. We cannot guarantee absolute security of your data.

11. Contact

If you have questions, comments, or requests regarding this Privacy Policy or the processing of your personal data, please contact us:

Email: contact@tennai.app

12. Consent

By using our services, you confirm that you have read and understood this Privacy Policy and agree to the processing of your data in accordance with its terms.

If you do not agree with the terms of this Privacy Policy, please do not use our services.

---

Note: This Privacy Policy is prepared taking into account the requirements of GDPR (General Data Protection Regulation of the EU) and Russian personal data protection legislation (Federal Law 152-FZ). If you are in another jurisdiction, additional requirements of local legislation may apply.