Terms of use

1. Agreement

These terms are an agreement between you and UMRATECH (“we”, “us”) for the use of Data Cleaning Exercises at datacleaningexercises.com (the “Service”). By creating an account, buying a plan or otherwise using the Service, you accept these terms and our privacy policy. If you don't accept them, don't use the Service.

If you use the Service on behalf of an organisation, you confirm that you're allowed to accept these terms for it.

2. The Service

Data Cleaning Exercises is an educational service for learning data cleaning. It provides lessons, a glossary, practice exercises with fictional datasets, a visual workspace, SQL and Python workspaces, automatic checking of your answers against the exercise rules (including on datasets you don't see), progress tracking, a certificate of completion for finishing every exercise and, on eligible plans, an AI tutor.

The Service teaches skills. It is not a data-processing service for real or confidential data, and it isn't professional, legal or employment advice. Completing exercises doesn't amount to a professional qualification or accreditation and doesn't guarantee any job outcome.

3. Eligibility and accounts

• You must be at least 16 years old, or the minimum age of digital consent where you live if higher. To buy a plan you must be an adult where you live or have a parent's or guardian's permission.
• Some exercises work without an account; saving progress, Pro content and the AI tutor require one.
• Give accurate account information and keep your sign-in details secure. You're responsible for activity under your account. Tell us promptly if you think someone else has accessed it.
• Accounts are personal. Don't share your account or let others use your plan. Team and classroom access is available on request through the contact form.

4. Free and paid plans

The Free plan includes the free starter exercises, the daily challenge, all lessons and the glossary. Paid plans add access to every exercise; Pro plans also include the AI tutor. What each plan includes and its current price are shown on the pricing page at the time you buy.

• Pro (monthly or annual) is a subscription. It renews automatically at the end of each billing period at the then-current price until you cancel.
• Lifetime learning is a one-time payment for access to all exercises, including new exercises published while the Service is offered. It doesn't include the AI tutor. “Lifetime” means for as long as we operate the Service, not for an unlimited time if the Service is closed.

Prices are shown in US dollars. Taxes such as VAT or sales tax may be added at checkout depending on where you live.

5. Payment, renewal and price changes

• Payments are taken by our payment processor when you buy and, for subscriptions, at the start of each renewal period. You authorise these charges to your chosen payment method.
• If a renewal payment fails, we and our payment processor may retry it. If it still can't be collected, your plan may end and your account will return to Free.
• We may change subscription prices. We'll tell you at least 30 days before a new price applies to your subscription, and you can cancel before it takes effect.
• Your invoices are available from Billing.

6. Cancellation and refunds

• Cancel any time from Billing. Your subscription won't renew, and you keep access until the end of the period you've paid for.
• 14-day refund on your first purchase. If you're not satisfied, contact us within 14 days of your first payment for a plan and we'll refund it in full. This applies once per customer.
• Apart from that, renewal payments and partial periods aren't refunded, except where the law requires otherwise or we decide to make an exception.
• If you live in the UK or the EU, you have a legal right to cancel a digital service within 14 days of purchase. You agree that access starts immediately; the 14-day refund above applies in any case.

When a paid plan ends, your completed progress stays in your account. Pro exercises and the AI tutor become unavailable until you subscribe again.

7. The AI tutor

• The tutor explains concepts, gives hints and helps you find mistakes. It is designed not to give complete solutions.
• Its answers are generated automatically and can be wrong or incomplete. Only the answer check decides whether your work is correct, and the tutor can't change grades, plans or access.
• Pro plans include a monthly allowance of tutor turns, shown on the pricing page. The allowance resets at the start of each calendar month (UTC), including on annual plans, and unused turns don't carry over. A fair-use limit on processing per month also applies, so very long or unusual requests may end the allowance early.
• Don't put real personal or confidential data into tutor questions. What the tutor receives is described in the privacy policy.

8. Acceptable use

Use the Service only for learning and only in lawful ways. In particular, you must not:

• try to access hidden datasets, expected answers, other users' data or any part of the Service you aren't authorised to access;
• submit code designed to attack, overload, escape or probe the systems that run answers, or to make network connections, mine cryptocurrency or run anything unrelated to the exercise;
• interfere with or disrupt the Service, bypass rate limits, usage allowances or access controls, or use automated means to access it at volume;
• copy, scrape, resell or republish exercises, lessons, datasets, hints or solutions, or build a competing product from them;
• share your account, or share Pro content with people who don't have access;
• upload or paste real personal, confidential or unlawful data, or content that infringes anyone's rights.

Answers obtained by breaking these rules don't count, and we may reset the affected progress.

9. Your content and our content

Your content. You keep the rights in the code, pipelines and messages you write. You give us a limited permission to store, run and process them as needed to provide the Service, for example to check your answers, save your drafts and answer tutor requests.

Our content. The Service, including its lessons, exercises, datasets, hints, software and design, belongs to us or our licensors. While your account is in good standing, we give you a personal, non-exclusive, non-transferable licence to use it for your own learning. Datasets marked as downloadable may be used for personal and classroom practice with attribution to Data Cleaning Exercises. All other rights are reserved.

Feedback. If you send us suggestions, we may use them without obligation to you.

Product and tool names mentioned in the Service belong to their owners and are used only to describe compatibility. We aren't affiliated with or endorsed by them.

10. Availability and changes

We work to keep the Service available and accurate, but it may sometimes be interrupted for maintenance or for reasons outside our control. We may change, add or retire features, exercises and lessons. If we remove something that is a main part of a paid plan, we'll offer you a fair alternative or a pro-rata refund of any prepaid period you can no longer use.

11. Suspension and termination

You can stop using the Service and delete your account at any time. Deleting your account doesn't cancel an active subscription automatically, so cancel it in Billing first.

We may suspend or close an account that seriously or repeatedly breaks these terms, or where we must do so by law. Where reasonable, we'll warn you first and give you a chance to fix the problem. If we close your account without a breach by you, we'll refund any prepaid period you can no longer use.

12. Disclaimers

The Service is provided for education. Apart from the commitments in these terms and the rights you have by law, we provide it “as is” and don't promise that it will be uninterrupted or error-free, that every lesson, exercise or tutor answer is complete or suitable for a particular purpose, or that it will lead to a particular result. Nothing in these terms limits rights you have as a consumer that can't be limited by contract.

13. Limitation of liability

To the extent the law allows, we aren't liable for indirect or consequential losses, or for loss of profits, revenue, data or opportunities, arising from your use of the Service. Our total liability to you for all claims relating to the Service is limited to the greater of the amount you paid us in the 12 months before the claim arose and US $50.

Nothing in these terms excludes or limits liability for death or personal injury caused by negligence, for fraud, or for anything else that can't be excluded or limited by law.

14. Governing law and disputes

These terms are governed by the laws of the country in which UMRATECH is established. If a dispute arises, please contact us first so we can try to solve it informally. If you're a consumer, you also benefit from the mandatory consumer protections of the country where you live and may bring proceedings in your local courts.

15. Changes to these terms

We may update these terms, for example when we add features or when the law changes. We'll show the new effective date at the top, and for significant changes we'll give you at least 30 days' notice by email or in the Service. If you don't agree with a change, you can cancel before it takes effect; continuing to use the Service afterwards means you accept the updated terms.

16. General

These terms and the privacy policy are the whole agreement between you and us about the Service. If a court finds part of them unenforceable, the rest stays in effect. If we don't enforce a right straight away, we can still enforce it later. You may not transfer your rights under these terms; we may transfer ours to a business that takes over the Service, provided your rights aren't reduced.

17. Contact

Questions about these terms, billing or refunds: email support@umratech.com or use the contact form.