Terms of service

Updated October 10, 2026

These terms are an agreement between you and Pablo Miranda, who runs ConvergerLab (convergerlab.com). By using the site you accept them. The privacy policy explains what is kept about you. Questions: support@pablin.me.

1. The service

ConvergerLab is a website of interactive lessons in mathematics and science, with practice, spaced review and guided walkthroughs called Explorations.The first unit of each course and the first part of each Explorations series are open to everyone; the rest come with ConvergerLab Pro. Courses, lessons and features change and grow over time.

The lessons are written and checked with care, but they are for learning, not professional advice, and we can't promise any grade or exam result. AP and Advanced Placement are trademarks registered by the College Board, which is not affiliated with, and does not endorse, this site.

2. Accounts

• You must be 13 or older to create an account. If you are under 18, you need a parent's or guardian's permission to buy Pro.
• An account is for one person. Use an email address you can read: it is how you sign in.
• You are responsible for what happens in your account; tell us if you think someone else has used it.

3. ConvergerLab Pro and payment

• Our order process is conducted by our online reseller Paddle.com. Paddle.com is the Merchant of Record for all our orders. Paddle provides all customer service inquiries and handles returns. Paddle's buyer terms also apply to your purchase.
• ConvergerLab Pro is a single purchase of US$25, not a subscription: nothing renews and nothing more is charged. The price is on the Pro page, and checkout shows it in your currency with any sales tax or VAT for your country.
• Pro is for the account that bought it, and gives it every lesson and Exploration, including those added later, for as long as ConvergerLab runs.
• If the price changes later, it doesn't affect a purchase already made.

4. Refunds

• 30 days: if ConvergerLab Pro isn't for you, ask for a full refund within 30 days of buying it, by writing to support@pablin.me or through Paddle, which sends your receipt. Pro ends on that account once it is refunded.
• After 30 days, purchases are not refunded.
• Nothing here limits your rights under the law where you live. Consumers in the European Union, the EEA, the United Kingdom and Switzerland have a statutory 14-day right to withdraw from a purchase of digital content; the 30 days above include it.

The refund policy also has its own page.

5. Using ConvergerLab fairly

Use the site for your own learning (a teacher may show it to a class). Don't:

• copy, sell or republish the lessons, problems, figures or Explorations, or share an account's access with others;
• get around the locks on Pro content, or scrape or download the site in bulk with automated tools;
• interfere with the site's working or security, or with anyone else's use of it.

6. What belongs to whom

The lessons, problems, figures, Explorations and software are ConvergerLab's. You may use them for learning as these terms allow; that permission ends when your access does. Your progress is yours: you can download it, and you can delete it with your account. If you send us a correction or a suggestion, we may use it freely to improve the site.

7. Availability

We work to keep ConvergerLab running and correct, but it is provided as it is, and it may sometimes be unavailable, change or have mistakes. Write to us about any you find.

8. Ending

You can stop using ConvergerLab and delete your account at any time. We may suspend or close an account that breaks these terms, after telling you why where we reasonably can. If we ever close ConvergerLab, we will tell everyone with Pro by email at least 30 days before, and your progress stays yours to download until then.

9. Liability

To the extent the law allows, ConvergerLab is not liable for indirect or consequential losses, and its total liability to you is limited to what you paid in the 12 months before the claim. Nothing in these terms limits liability that can't be limited by law, or your statutory rights as a consumer.

10. Changes to these terms

If these terms change, the new version appears here with its date. If a change matters to people with Pro, we email them at least 30 days before it applies.