Terms of Service for ChemLab: Periodic Table

Effective date: November 7, 2026
Last updated: November 7, 2026

These Terms of Service ("Terms") are an agreement between you and AppMaven ("we", "us") for the ChemLab: Periodic Table Android app (the "App", package name com.appmaven.chemlab) and its updates. By installing or using the App you agree to these Terms and to our Privacy Policy. If you do not agree, please do not use the App.

Your use of the App is also subject to the Google Play Terms of Service and Google Play policies. Where they conflict with these Terms on distribution or on purchases made through Google Play, Google Play's terms apply to those matters.

1. Eligibility

The App is intended for users aged 13 and over (or the minimum age of digital consent in your country, if higher). If you are under the age of majority where you live, use the App only with the permission of a parent or legal guardian. To make in-app purchases you must be allowed to use the payment method, or have a parent's or guardian's permission. Teachers and schools may use the App and the worksheets it creates for teaching.

2. License to use

If you follow these Terms, we grant you a limited, personal, non-exclusive, non-transferable, revocable license to install and use the App on devices you own or control, for personal or educational, non-commercial purposes. You may print and share worksheets you create with the App with your own students or study group. All rights not expressly granted are reserved by AppMaven and its licensors.

3. Things you may not do

• Copy, modify, distribute, sell, rent or sublicense the App or any part of it, or republish its data set or content as a competing product.
• Reverse engineer or decompile the App, except where applicable law allows this despite this restriction.
• Tamper with or bypass advertising, in-app purchases or free-plan limits to obtain features you did not buy.
• Use the App in a way that breaks the law or infringes the rights of others.

4. In-app purchase (ChemLab Pro)

All chemistry tools stay free. The optional ChemLab Pro upgrade is a one-time purchase processed by Google Play Billing; it is not a subscription and does not renew. Pro removes ads and the free-plan limits: unlimited worksheets (the free plan allows 3 per day), PDF export of worksheets, full history (up to 500 items instead of the last 30) and the light theme. The features included are those described in the App at the time of purchase. Payments are handled by Google; we do not receive or store your payment card details. Prices are shown on Google Play and in the App, may include taxes and may differ by country.

4.1 Restoring Pro

Pro is linked to the Google account you used to buy it. You can use "Restore purchases" in the App, for example after reinstalling it or on another device signed in to the same Google Play account. If a purchase is refunded or no longer appears in your Google Play account, the App may return to the free plan.

4.2 Refunds

Purchases are made through Google Play, and refund requests follow Google Play's refund process. We cannot issue Google Play refunds directly. Nothing in these Terms limits consumer rights you have under laws that cannot be waived.

5. Advertising

If you do not have Pro, the App shows ads from Google AdMob: ads when you open or return to the App, full-screen ads that may appear when you leave a chemistry tool, and native ads within some screens. Where the law requires it, the App asks for your advertising privacy choices through Google's User Messaging Platform, and you can change them later from the Profile screen. Ads are provided by third parties, and we are not responsible for their content or for the products they promote. How advertising uses data, and the choices you have, are described in the Privacy Policy.

6. Educational content and lab safety

• The periodic table, element data, ions, solubility rules, electron configurations, calculators, equation balancer, reaction predictor and worksheets are provided for learning and reference only. They are simplified models and may contain errors, omissions or values that differ from other sources. Check important values against your textbook, teacher or an authoritative reference.
• The reaction predictor uses general textbook rules. A predicted product does not mean a reaction is safe, will happen in practice, or should be tried. The App does not provide instructions for carrying out experiments, and nothing in it is safety, medical or professional advice.
• Never handle chemicals or attempt reactions based on the App. Practical chemistry should only be done in a proper laboratory, with the right protective equipment, following the safety data sheets and the supervision of a qualified teacher or professional.
• Worksheets and answer keys are generated automatically. Teachers should review them before giving them to students.

7. Your data

The App has no account and no cloud sync. Favorites, history, worksheet counts, theme and other settings are stored on your device. Depending on your Android backup settings, app data may be included in your device backup to your own Google account; we do not control or access that backup. If you uninstall the App, clear its data, or change or lose your device, local data may be lost and we cannot restore it. The App uses Firebase Analytics to understand how features are used, as described in the Privacy Policy.

8. Updates and availability

We may release updates and add, change or remove features or content. Some updates may be needed to keep using the App. We may suspend or discontinue the App, in whole or in part, to the extent permitted by law. We do not guarantee that the App will always be available or free of errors.

9. Intellectual property

The App and its content, including code, design, illustrations, text, worksheet templates and the ChemLab name and logo, belong to AppMaven or its licensors and are protected by intellectual property laws. Scientific facts themselves are not owned by anyone. The App is built with Flutter and includes third-party components, such as the Google Mobile Ads SDK, Google User Messaging Platform, Google Play Billing (through the in_app_purchase plugin), Firebase Analytics and open-source libraries and fonts, which remain the property of their owners and are used under their licenses.

10. Disclaimer of warranties

To the maximum extent permitted by law, the App is provided "as is" and "as available", without warranties of any kind, express or implied, including accuracy of content, fitness for a particular purpose and non-infringement. Some jurisdictions do not allow certain exclusions, so some of them may not apply to you.

11. Limitation of liability

To the maximum extent permitted by law, AppMaven is not liable for indirect, incidental, special or consequential damages, for loss of data, for exam or grading results, or for any injury or damage resulting from attempting experiments or handling chemicals, arising from your use of or inability to use the App. Our total liability for all claims relating to the App is limited to the greater of the amount you paid for in-app purchases in the App in the 12 months before the claim, or USD 10. Nothing in these Terms excludes liability that cannot be excluded by law, such as liability for fraud, or for death or personal injury caused by negligence.

12. Suspension and termination

You may stop using the App at any time by uninstalling it. We may suspend or end your access to the App or some features if you seriously break these Terms, commit fraud, or where the law requires it. Sections that by their nature should continue, including sections 6, 7, 9, 10, 11 and 13, survive termination. Termination does not entitle you to a refund except where required by law.

13. Governing law and disputes

These Terms are governed by the laws of the Socialist Republic of Vietnam, without regard to conflict-of-law rules. Subject to mandatory consumer protection laws of your country of residence that let you bring proceedings locally, disputes relating to these Terms or the App will be handled by the competent courts of Vietnam. If you are a consumer in the EEA or UK, this choice of law does not take away the protection of the mandatory laws of your country.

14. Changes to these Terms

We may update these Terms. When we make material changes we will update the date above and, where appropriate, give notice in the App or on the store listing. If you keep using the App after the changes take effect, the updated Terms apply. If you do not agree, please stop using the App.

15. Other terms

These Terms and the Privacy Policy are the whole agreement between you and AppMaven about the App. If any part is found unenforceable, the rest remains in effect. Not enforcing a provision is not a waiver of it.

• Google Play Terms of Service
• Google Terms of Service

Contact

Developer: AppMaven
App: ChemLab: Periodic Table (com.appmaven.chemlab)
Email: hacong86@gmail.com
Support: appmavenstudio.com/support

Related: Privacy Policy · App page