Privacy Policy for 꾸런 (kkurun)

Last Updated: December 20, 2025

Effective Date: November 3, 2025

Introduction

Welcome to 꾸런 (kkurun) - "Run Consistently" ("꾸준히 달리기"). We respect your privacy and are committed to protecting your personal data. This privacy policy explains how we collect, use, store, and protect your information when you use our mobile application.

Developer Information:

App Name: 꾸런 (kkurun)
Contact Email: kdevbrother@gmail.com
Operation: This service is operated by a solo developer as a personal project. As such, response times, support availability, and service maintenance may be limited.

By using kkurun, you agree to the collection and use of information in accordance with this policy.

1. Information We Collect

1.1 Personal Information

Phone Number

We collect your phone number for account creation and authentication purposes
Used to uniquely identify your account and enable secure login via OTP (One-Time Password)
Required for using the app

User Profile Information

Display name (nickname)
Profile picture (optional)
User preferences (theme, language, measurement units)

1.2 Activity & Health Data

Running/Walking Records

Distance, duration, pace, speed
Calories burned
Workout date and time
Incline/elevation data (when available)
Workout type (running, walking, etc.)
Manual notes and descriptions

Location Data

GPS coordinates during workouts (if location tracking is enabled)
Used to track routes and calculate distance/pace
Location data is collected only when you start a workout and grant permission
Background location tracking occurs during active workouts only

Workout Images

Screenshots or photos of workout summaries from other fitness apps
Images are uploaded to secure cloud storage
AI processing is used to extract workout data from images (distance, duration, calories, etc.)

1.3 Usage Data

App Usage Analytics

Feature usage patterns
Workout statistics and personal records
Streak information (consecutive workout days)
Challenge room participation (if applicable)

Technical Data

Device type and operating system version
App version
Error logs and crash reports (for debugging)
Network connectivity status

1.4 Camera & Photo Library Access

We request camera access to capture workout screenshots
We request photo library access to upload existing workout images
These permissions are optional but enhance app functionality
Images are used solely for extracting workout data and displaying in your records

1.5 Health Platform Integration

Apple Health (iOS) & Health Connect (Android)

With your explicit permission, 꾸런 can import workout data from:

Apple Health on iOS devices
Health Connect on Android devices

What We Access:

Walking and running workout sessions
Distance traveled during workouts
Calories burned during exercise
Workout duration and timestamps

How We Use This Data:

Display your workout history within the app
Calculate statistics like total distance and personal records
Sync workout data to your 꾸런 account
Provide personalized fitness recommendations based on your activity patterns

Your Control:

Health data access requires your explicit permission
You can revoke access anytime in your device's Settings
You can delete imported workouts from your 꾸런 account

2. How We Use Your Information

We use the collected information for the following purposes:

2.1 Core App Functionality

Authentication: Phone number verification and secure login
Workout Tracking: Recording, storing, and displaying your exercise history
Data Analysis: Calculating personal records, streaks, and statistics
AI Extraction: Processing workout images to automatically extract data using AI technology

2.2 Social Features

Challenge Rooms: Enable participation in group fitness challenges
Leaderboards: Compare progress with other users (anonymized or with explicit consent)
Sharing: Allow you to share achievements with friends

2.3 App Improvement

Analytics: Understand how users interact with the app
Bug Fixes: Diagnose and resolve technical issues
Feature Development: Identify and develop new features based on usage patterns

2.4 Communication

Service Updates: Notify you about app updates, new features, or changes
Support: Respond to your inquiries and provide customer support

2.5 Advertising

Ad Delivery: The app displays advertisements to support free access to our services
Ad Personalization: Usage data may be used to show relevant advertisements
Third-Party Ad Networks: We work with advertising partners who may collect data for ad targeting
Opt-Out: You may have options to limit ad personalization through your device settings

3. Data Storage & Security

3.1 Where Your Data is Stored

Cloud Storage

Your data is stored on secure backend servers using industry-standard encryption
Workout images are stored in S3-compatible cloud storage with secure access controls
Database: PostgreSQL (backend-managed, no direct client access)
Server Location: United States (Railway infrastructure)

Local Storage

Some data is cached locally on your device for offline access and performance
Local cache includes recent workout records
Local data is stored using secure SQLite database

3.2 Security Measures

We implement reasonable security measures to protect your data, taking into account the nature and scope of this solo-operated service:

Encryption in Transit: All data transmitted between your device and our servers uses HTTPS/TLS encryption
Encryption at Rest: Sensitive data is encrypted when stored on our servers
Authentication: JWT (JSON Web Token) based authentication for secure API access
Access Controls: Access controls limit who can access your personal data
Security Reviews: We may periodically review and update our security practices when resources allow

Note: While we strive to protect your data using reasonable measures appropriate for a solo-operated service, no method of transmission or storage is 100% secure. We cannot guarantee absolute security, and security measures may vary based on available resources and technical constraints. You acknowledge that this service is operated with limited resources and accept the associated risks.

4. Data Sharing & Disclosure

4.1 Third-Party Services

We use the following third-party services that may process your data:

AI Image Processing

Provider: Google Gemini API
Purpose: Extract workout data from images
Data Shared: Workout images only
Privacy Policy: Google Privacy Policy

Cloud Storage

Provider: Cloudflare R2
Purpose: Store workout images
Data Shared: Images uploaded by you
Privacy Policy: Cloudflare Privacy Policy

Backend Infrastructure

Provider: Railway
Purpose: Host application servers and database
Data Shared: All data collected by the app
Privacy Policy: Railway Privacy Policy

4.2 When We Share Data

We may share your data in the following circumstances:

With Your Consent

When you explicitly choose to share workout achievements
When you join challenge rooms with other users

For Legal Compliance

If required by law, court order, or government regulation
To protect our rights, privacy, safety, or property
To enforce our Terms of Service

Business Transfers

In the event of a merger, acquisition, or sale of assets, your data may be transferred to the new owner

Aggregated/Anonymized Data

We may share aggregated, anonymized statistics that cannot identify you individually

4.3 What We Never Do

We NEVER sell your personal data to third parties
We NEVER share your location data without your explicit consent
We NEVER use your data for advertising purposes outside the app

5. Your Privacy Rights

5.1 Access & Control

You have the following rights regarding your data:

Access Your Data

View all your workout records, profile information, and settings within the app

Modify Your Data

Edit your profile information, workout records, and preferences at any time

Delete Your Data

Request deletion of specific workout records
Request complete account deletion (see Section 5.2)

Export Your Data

Request a copy of your data in a portable format (contact support)

5.2 Account Deletion

You can request deletion of your account and all associated data:

Contact us at kdevbrother@gmail.com
We will attempt to delete your account as soon as practicable, but given this is a solo-operated service, deletion may take longer due to technical constraints, backup systems, limited resources, or other operational factors
Deleted data includes:
- Phone number and profile information
- All workout records and statistics
- Uploaded images
- Challenge room participation history

Note: Some data may be retained for legal compliance, fraud prevention, or technical reasons. Due to the nature of backup systems and solo operation, complete deletion may not be immediate and may take a reasonable period of time.

5.3 Opt-Out Options

Location Tracking

Disable location permissions in your device settings
Note: This will limit workout tracking functionality

Camera/Photo Access

Disable camera/photo permissions in your device settings
Note: You won't be able to upload workout images

Analytics

[IF APPLICABLE: Instructions for opting out of analytics]

6. Data Retention

Active Accounts

We retain your data for as long as your account is active, or as otherwise required by law

Inactive Accounts

Accounts inactive for an extended period may be flagged for deletion at our discretion
We may, but are not obligated to, notify you before any deletion occurs
Due to the solo-operated nature of this service, inactive account management may vary

Deleted Accounts

Upon account deletion request, we will attempt to delete your data as soon as practicable
Complete deletion may take time due to backup systems, technical constraints, or operational limitations inherent in solo operation
Some data may be retained for longer periods in backup systems, for legal compliance, or for technical reasons
Aggregated, anonymized data may be retained indefinitely

7. Children's Privacy

kkurun is not intended for users under the age of 13 (or applicable age in your region). We do not knowingly collect personal information from children. If you believe a child has provided us with personal data, please contact us immediately, and we will take steps to delete such information.

8. Changes to This Privacy Policy

We may update this privacy policy from time to time to reflect:

Changes in our data practices
New features or services
Legal or regulatory requirements

How We May Notify You:

Updated "Last Updated" date at the top of this policy (this is the primary method of notification)
We may, but are not obligated to, provide in-app notifications for significant changes
We may, but are not obligated to, send email notifications if we have your email and choose to do so

Your Continued Use:

Continued use of the app after changes become effective constitutes acceptance of the updated policy, regardless of whether you received notice of the changes
You are responsible for reviewing this policy periodically to stay informed of any updates

10. Contact Us

If you have questions, concerns, or requests regarding this privacy policy or your data:

Email: kdevbrother@gmail.com

Note: This is a solo-operated service. While we will attempt to respond to inquiries when possible, we make no guarantees regarding response times or availability. Response times may vary significantly and are not guaranteed. Due to limited resources, some requests may take longer to process or may not be immediately addressed.

11. Consent

By using kkurun, you consent to:

The collection and use of information as described in this privacy policy
The transfer and storage of your data as described
The use of cookies and similar technologies (if applicable)

If you do not agree with this privacy policy, please do not use the app.

Version History:

v1.1 - [December 20, 2025] - Added Health Platform Integration section (Apple Health & Health Connect)
v1.0 - [November 3, 2025] - Initial privacy policy

KKURUN - Privacy Policy