Effective Date · April 7, 2026

This Privacy Policy applies to all mobile applications published by Ink & Iron Apps ("we", "us", "our"), including but not limited to MatCalc, LibraryIQ, and any future applications distributed under the Ink & Iron Apps brand. This policy explains what information we may collect, how we use it, and your choices regarding your data.

Information We May Collect

Depending on the app and features you use, we may collect the following types of information:

Account Information

Some of our apps allow or require you to create an account or sign in using third-party authentication providers (such as Google Sign-In, Apple Sign-In, or email/password). When you sign in, we may collect:

• Your name and email address
• Profile photo (if provided by the authentication provider)
• A unique user identifier

This information is used solely to identify your account and provide personalized features within the app.

User-Generated Content

Some of our apps allow you to create, store, and manage content such as lists, notes, preferences, settings, and calculation history. This content may be stored:

• Locally on your device — accessible only to you and deletable by clearing app data or uninstalling the app
• In the cloud — synced to secure cloud services (such as Firebase or Supabase) to enable features like backup, sync across devices, or sharing

Usage and Analytics Data

Some of our apps may use analytics services to help us understand how users interact with our apps and to improve the user experience. This may include:

• App usage patterns (screens viewed, features used)
• Device information (model, operating system version, screen size)
• Crash reports and performance data
• General location data (country or region level, not precise location)

We may use third-party services for analytics and crash reporting, including but not limited to Google Analytics for Firebase and Firebase Crashlytics.

Advertising Data

Some of our apps may display advertisements provided by third-party ad networks. These networks may collect:

• Advertising identifiers (such as Google Advertising ID)
• General device and usage information
• Ad interaction data (impressions, clicks)

We do not sell your personal information to advertisers. Third-party ad networks operate under their own privacy policies.

How We Use Your Information

We use the information we collect to:

• Provide, maintain, and improve our apps
• Authenticate your identity and manage your account
• Sync your data across devices where applicable
• Analyze usage patterns to improve the user experience
• Diagnose technical issues and fix bugs
• Display relevant advertisements where applicable
• Comply with legal obligations

Data Sharing

We do not sell your personal information. We may share your information only in the following circumstances:

• Service providers — with trusted third-party services that help us operate our apps (e.g., cloud hosting, analytics, authentication providers), subject to their own privacy policies
• Legal requirements — when required by law, regulation, legal process, or governmental request
• Safety — to protect the rights, property, or safety of Ink & Iron Apps, our users, or the public

Data Security

We take reasonable measures to protect your information from unauthorized access, alteration, disclosure, or destruction. However, no method of transmission over the internet or electronic storage is completely secure, and we cannot guarantee absolute security.

Data Retention

We retain your information for as long as your account is active or as needed to provide you services. You may delete your account and associated data at any time through the app or by contacting us. Locally stored data can be deleted by clearing the app's data or uninstalling the app.

Your Choices

• Account deletion — you can request deletion of your account and associated data by contacting us
• Local data — you can clear locally stored data through your device settings
• Analytics opt-out — where available, you can opt out of analytics collection through the app's settings
• Ad personalization — you can reset your advertising identifier or opt out of personalized ads through your device settings

Children's Privacy

Our apps are not directed at children under the age of 13. We do not knowingly collect personal information from children under 13. If you believe we have collected information from a child under 13, please contact us and we will promptly delete it.

Third-Party Links and Services

Our apps may contain links to third-party websites or integrate with third-party services. We are not responsible for the privacy practices of these third parties. We encourage you to review their privacy policies.

Changes to This Policy

We may update this Privacy Policy from time to time. Any changes will be posted on this page with an updated effective date. We encourage you to review this page periodically. Your continued use of our apps after changes constitutes acceptance of the updated policy.

Contact Us

If you have any questions about this Privacy Policy or wish to exercise your data rights, please contact us at:

Email: privacy@inknironapps.com