Mind Journal Privacy Policy
**Last updated:** July 11, 2026
This Privacy Policy explains how ZHLab AI ("we," "us," or "our") handles your personal information when you use Mind Journal (the "App").
If you do not agree with this policy, please do not use the App. By using the App, you acknowledge that you have read and understood this policy.
1. Scope
This policy applies to:
• The Android version of Mind Journal (Google Play release)
• Backend services connected to the App (https://mind-api.zhlabai.com)
• Data processing related to Google Sign-In, Google Play subscriptions, and AI analysis features
This policy does not apply to third-party services (such as Google and Google Play) that maintain their own privacy policies.
2. Developer and Contact Information
| Item | Details |
| --- | --- |
| App name | Mind Journal |
| Android package name | com.zhlab.ai.mind |
| Developer / operator | ZHLab AI |
| Official website | https://mind.zhlabai.com |
| Privacy policy URL | https://mind.zhlabai.com/privacy |
| Support / privacy contact email | [email protected] |
If you have questions about this policy or wish to access, correct, or delete your data, please email us at the address above. We will respond within a reasonable time.
3. Overview of App Features
Mind Journal is a mood journal and self-awareness tool. Main features include:
• Creating, editing, and deleting mood journal entries on your device
• Creating and managing personal schedules
• AI-powered journal analysis (daily and weekly)
• AI-generated schedule draft suggestions
• Signing in with a Google account to sync Premium membership status
• Purchasing Premium subscriptions through Google Play
• Setting local reminder notifications (e.g., water intake, medication, custom reminders)
**Important notice:** The App is intended for self-awareness, emotional reflection, and life organization only. It is not a substitute for counseling, medical diagnosis, psychiatric treatment, or emergency medical care. If you are at risk of self-harm, harming others, or in immediate danger, contact local emergency services, a trusted person, or qualified medical or mental health professionals right away.
4. Data We Collect
4.1 Data You Provide
| Data type | Purpose | Storage location |
| --- | --- | --- |
| Mood journal text | For you to record, edit, and view; used as input when you trigger AI analysis | Primarily stored locally on your device |
| Schedule items | For you to manage personal tasks and reminders | Primarily stored locally on your device |
| AI analysis results | To display analysis summaries, emotional insights, and action suggestions | Primarily stored locally on your device |
| Reminder settings | To configure water, medication, or custom reminders | Stored locally on your device |
| Language / theme preferences | To adjust App language and appearance | Stored locally on your device |
4.2 Data Collected When You Use Google Sign-In
If you choose "Sign in with Google," we obtain the following through Google OAuth and store it on our servers:
• Google user identifier (Subject ID)
• Email address (if provided by your Google account)
• Display name (if provided by your Google account)
• Profile photo URL (if provided by your Google account)
We use this information to create and identify your account, show sign-in status, sync Premium membership, and support account deletion.
4.3 AI Analysis Data
When you actively request AI analysis, the App sends journal content from your selected date range (text, date, time, and entry ID) to our backend API to generate analysis results.
Our backend also records AI usage logs, such as:
• Anonymous identifier or signed-in user ID
• Request endpoint and task type
• AI provider and model name
• Success status, error messages, and response latency
We do not permanently store full journal content as a separate database field for AI analysis. However, AI providers may temporarily process the journal text you submit while handling your request. See Section 6, "Third-Party Services."
4.4 Subscription and Payment Data
If you purchase a Premium subscription:
• Payment is processed by Google Play; we do not directly collect or store your credit card number or full payment card details
• The App receives information returned by Google Play, such as purchaseToken, product ID, and subscription status
• Our backend stores subscription status, plan type, expiration time, and a summary of Google Play verification results to determine Premium membership
Current Google Play subscription products:
| Product ID | Plan |
| --- | --- |
| premium-monthly | Monthly Premium |
| premium-yearly | Yearly Premium |
| premium-monthly + offer free-trial-5d | 5-day free trial (converts to monthly billing after the trial unless you cancel) |
Actual pricing, currency, and trial terms are determined by Google Play.
4.5 Automatically Generated Identifiers
| Data type | Purpose |
| --- | --- |
| Anonymous identifier (UUID) | To identify your device when not signed in, for AI usage limits, subscription linking, and similar purposes |
| Sign-in session tokens | To maintain sign-in state and refresh access tokens |
| App version information | To check for updates and troubleshoot issues |
4.6 Device Permissions and Actual Use
| Permission | Used? | Description |
| --- | --- | --- |
| Internet (INTERNET) | Yes | Backend API, Google Sign-In, Google Play Billing, AI analysis |
| Camera (CAMERA) | Optional | You may take a photo on the journal edit screen; currently only inserts a local photo marker in text and does not upload photos to our servers |
| Photo library access | Optional | You may pick an image from your library; currently only inserts a local image marker in text and does not upload images to our servers |
| Google Play Billing | Yes | Premium subscription processing |
| Exact alarms / local notifications | Optional | Used to schedule local notifications if you enable reminders |
| Microphone | No (currently) | A UI entry point exists, but voice input is not yet implemented |
| Advertising ID (AD_ID) | No | The App does not use advertising IDs and does not show ads |
5. How We Use Data
We use the data described above only for the following purposes:
• Providing, maintaining, and improving App features
• Running AI journal analysis, weekly reviews, and schedule draft suggestions
• Verifying Google Sign-In and managing accounts
• Verifying Google Play subscriptions and providing Premium benefits
• Enforcing free / Premium usage limits
• Delivering local reminder notifications
• Debugging, security, abuse prevention, and service quality monitoring
• Complying with applicable legal obligations
We do not sell your personal data.
6. Third-Party Services
The App uses the following third-party services, which may process data under their own policies:
| Third party | Purpose | Data that may be involved |
| --- | --- | --- |
| Google / Google Sign-In | Account sign-in | Email, name, profile photo, Google user ID |
| Google Play / Google Play Billing | Subscription payment and verification | Purchase token, subscription status, Google account transaction information |
| Google Play Developer API | Backend subscription verification | Subscription token, product ID, expiration time |
| DeepSeek (AI model provider) | Mood journal AI analysis | Journal text and analysis prompts you actively submit |
Please review the official privacy policies of these third parties:
• Google Privacy Policy: https://policies.google.com/privacy
• Google Play Terms of Service: https://play.google.com/about/play-terms/
7. Data Storage Locations and Retention
7.1 Stored on Your Device
The following data is stored locally on your phone or tablet by default (localStorage / Preferences):
• Mood journal entries
• AI analysis results
• Schedule data
• Reminder settings
• Anonymous identifier
• Sign-in session (if signed in)
Uninstalling the App usually deletes local data, though results may vary depending on your device backup settings.
7.2 Stored on Our Servers
Our servers may store:
• Google sign-in account information
• Premium subscription status
• AI usage logs (without permanently archiving full journal content)
• Sign-in refresh tokens (until sign-out, expiration, or account deletion)
We retain data only for as long as necessary to fulfill the purposes described above. After account deletion, related cloud account data will be removed or de-identified, except where retention is required by law.
8. Data Sharing
We do not sell personal data to third parties. We may share data only in the following situations:
• **Service providers:** such as AI model providers and cloud hosting providers, and only as needed to provide the service
• **Google:** for sign-in, payment, and subscription verification
• **Legal requirements:** court orders or lawful requests from competent authorities
• **Protection of rights:** to prevent fraud, abuse, security incidents, or harm to persons
9. Data Security
We use reasonable technical and organizational measures to protect data, including:
• Encryption in transit (HTTPS / TLS)
• Server-side access controls
• Hashed storage of Google Play subscription tokens
• Management of sign-in tokens and refresh tokens
However, no method of transmission or storage over the internet is 100% secure.
10. Your Rights and Choices
Depending on your jurisdiction, you may have the following rights:
10.1 Access, Correction, and Deletion
• **Local data:** You can edit or delete journal entries, schedules, and reminders in the App
• **Cloud account data:** You can use "Delete account" in Settings; this removes account data from our servers and cannot be undone
• **Google Sign-In:** You can sign out at any time
10.2 Choosing Not to Provide Data
• You can use basic features without signing in with Google
• You can choose not to purchase Premium
• You can choose not to use AI analysis
• You can decline optional permissions such as camera or notifications
10.3 Subscription Management
Premium subscriptions are managed by Google Play. You can go to Google Play → Payments & subscriptions → Subscriptions to cancel, restore, or request refunds in accordance with Google policies.
11. Children's Privacy
The App is not designed for children under 13, and we do not knowingly collect personal data from children under 13.
If you are a parent or guardian and believe a child has provided data without consent, please contact us and we will help delete the relevant data.
12. International Data Transfers
Our backend and AI services may be located outside your country or region. By using the App, you understand that your data may be transferred across borders and protected under this policy and applicable law.
13. Sensitive Information Notice
You may record highly personal or sensitive information in your journal, such as emotions, stress, relationships, or health-related feelings. Please:
• Decide for yourself whether specific content is appropriate to enter
• Understand that AI analysis sends selected journal text to our backend and AI providers for processing
• Use caution on shared devices regarding sign-in and screen lock
14. Changes to This Policy
We may update this policy due to feature changes, legal requirements, or operational needs. Updates will be posted on this page or announced in the App, and the "Last updated" date will be revised. For material changes, we will notify you in a reasonable manner.
15. Governing Law and Disputes
This policy is interpreted and applied under the laws of your applicable jurisdiction. If you have concerns about data processing, please contact us first; we will address your request in good faith.
16. Contact Us
If you have any questions about this Privacy Policy, please contact us at: