Terms of Service

1. WHO WE ARE

SulekhaDD AB Registration number (organisationsnummer): 559597-8635 VAT number: SE559597863501 Address: Kungälv, Sweden Email: dubu@sulekhadd.app

Email is the fastest and most reliable way to reach us, and we use it for all questions, complaints, content corrections and legal notices relating to the app.

2. WHO CAN USE DŪBU

2.1 Minimum age. You must be at least 16 years old to create a Dūbu account. If you are in India, you must be at least 18 years old, or have verifiable consent from a parent or legal guardian, as required by Indian data protection law.

2.2 One account per person. You may hold only one Dūbu account. Creating multiple accounts — including to obtain additional free quiz attempts, additional free tokens, or additional leaderboard entries — is a breach of these Terms.

2.3 Account security. Sign-in to Dūbu uses Google Sign-In. You are responsible for keeping your Google account secure and for activity that takes place under your Dūbu account.

2.4 Where you may use Dūbu. You may not use Dūbu where doing so would break the law that applies to you.

3. YOUR ACCOUNT

3.1 Creating an account. Dūbu uses Google Sign-In through Firebase Authentication. We store a minimal user record (your user id, display name, email, device model and app version) so the app can sync your progress and purchases across devices.

3.2 Your display name is visible to others. If you take part in Arena quizzes, your display name and score appear on leaderboards visible to other users. Your display name is taken from the Google account you sign in with, and Dūbu does not currently let you set a different one. If you do not want that name shown to other users, do not take part in Arena — practice study and quizzes are private.

3.3 Closing your account. You may sign out or delete your account from within the app at any time. Deleting your account is explained in our Privacy Policy, including what happens to your data.

3.4 Our right to suspend or close an account. We may suspend or close an account, with or without notice depending on the seriousness of the matter, where we have reasonable grounds to believe that you have:

• broken these Terms, including the acceptable use rules in section 8;
• manipulated quizzes, leaderboards or the token system, including through multiple accounts, automated play, or modified versions of the app;
• extracted or redistributed our content in bulk;
• abused refunds or chargebacks; or
• used Dūbu unlawfully.

3.5 What happens to what you have paid for. Suspending or closing an account does not remove what you have paid for. Deck unlocks and unused tokens stay on the account.

• If we lift a suspension, your unlocks and your balance are available again in full.
• If a closure is permanent, we will refund the unused portion of any purchase where the law requires it, and will consider a refund in good faith in other cases. The account and its data are then deleted as described in our Privacy Policy.

3.6 Appeal. If we suspend or close your account, we will tell you why. You may contest the decision by writing to dubu@sulekhadd.app, and we will review it and reply within 14 days.

4. YOUR LICENCE TO USE DŪBU

4.1 What you get. We grant you a personal, limited, revocable, non-exclusive and non-transferable licence to install and use Dūbu on devices you control, for your own study. The licence lasts as long as your account, and ends when your account ends.

4.2 What the licence does not allow. You may not:

• copy, modify, translate or create derivative versions of the app software;
• rent, lend, sell, sublicense or otherwise transfer your access;
• extract, scrape, or systematically copy the app's content, in bulk or otherwise, whether manually or by automated means;
• use bots, emulators, modified clients, or any other means to automate play or interfere with quizzes and leaderboards; or
• remove or obscure any notices of ownership, attribution or licensing.

4.3 Reverse engineering. You may not reverse engineer, decompile or disassemble the app, except to the extent that applicable law gives you that right and prevents us from restricting it — in particular, rights relating to interoperability under EU law.

5. STUDY CONTENT — IMPORTANT DISCLAIMER

This section is important. Please read it.

5.1 Where the content comes from. The study cards, quizzes, facts and explanations in Dūbu are compiled from publicly available sources, including Wikipedia and other open references.

5.2 How the content is produced. Our content is prepared with the assistance of automated tools, including AI-based drafting and translation, and is reviewed by us before publication. We tell you this because we think you should know how the material you study was made.

5.3 Dūbu is a study aid, not official material. Dūbu is a study and reference aid only. It is not official government material. It is not affiliated with, endorsed by, approved by, licensed by, accredited by, or produced by any government, ministry, migration or immigration authority, examination board, testing provider, educational institution, or other public or official body in any country.

5.4 Names of authorities and tests. Where the app names an authority, official test, institution or public body, that name is used only to identify the subject you are studying. It does not imply any association with, sponsorship by, or approval from that organisation.

5.5 No guarantee of outcomes. We do not guarantee that the content is complete, current, or free from error, and we make no guarantee about any citizenship test result, examination outcome, application decision, or other outcome you may pursue.

5.6 Official sources are what count. Official requirements, test questions, procedures, fees and eligibility rules are set solely by the competent authorities of the country concerned and can change at any time. Always rely on those official sources for binding information.

5.7 Tell us if something is wrong. We review and correct content on an ongoing basis. If you believe something is inaccurate or out of date, please tell us at dubu@sulekhadd.app. We aim to acknowledge content reports within 5 working days and to correct confirmed errors in the next content release.

5.8 Corrections and suggestions you send us. If you send us a correction, suggestion or idea about the app or its content, you allow us to use it without restriction and without payment. We will not identify you as its source unless you ask us to.

6. PURCHASES AND PAYMENTS

6.1 What is on sale. Two things in Dūbu can be paid for: deck unlocks, which are permanent, and tokens, which are consumable. Around a third of our decks are free and stay free.

6.2 How payment works. All purchases are processed by the app store you downloaded Dūbu from — currently Google Play Billing. We never receive or store your card details. Prices shown are provided by the store for your region and include applicable taxes.

6.3 Prices are always shown in real money. Wherever tokens can be spent in the app, we show what the item costs in tokens and what those tokens cost in your local currency. We will not design purchase flows that hide or obscure the real cost of anything.

Deck unlocks

6.4 A purchased deck unlock is tied to your account and is restored for free whenever you reinstall or update the app. Updating Dūbu is always free and never removes access to content you have already unlocked.

6.5 Deck prices, whether in money or in tokens, may change over time. A change never affects a deck you have already unlocked.

Tokens

6.6 What tokens are. Tokens are a prepaid in-app credit used to pay for quiz attempts and other features inside Dūbu. They are not money, not electronic money, and not a payment instrument.

6.7 Tokens never expire. Tokens stay on your account for as long as your account exists, however you obtained them.

6.8 Tokens cannot be cashed out or transferred. Tokens have no value outside Dūbu. They cannot be exchanged for money, sold, gifted, or moved between accounts.

6.9 Spending tokens. A token is consumed when you use it. Consumed tokens are not refundable, except where the law gives you a right to a refund — for example, where the feature you spent them on did not work.

6.10 Your token balance is global. Your balance is the same wherever you are and whichever study country you select in the app. Switching study country never resets, splits or converts your balance.

6.11 If you close your account. Unused tokens are lost when you delete your own account. Please spend your balance first. This does not affect any refund right you have by law.

6.12 If we withdraw a feature you could spend tokens on. See section 10.3.

6.13 No random purchases. Everything you can buy in Dūbu has a known, fixed outcome. We do not sell loot boxes, mystery packs, or any item whose contents are randomised.

6.14 Rewards are not purchases. Tokens you earn — for example from the daily Arena — are granted at our discretion under section 7 and are not something you have bought.

6.15 Price changes. We may change the price of token packs. Changes apply only to future purchases. Where we materially change or withdraw a pack, we will give notice in the app.

7. ARENA AND LEADERBOARDS

7.1 How Arena works. Arena is a daily competitive quiz. Your first attempt at each Arena quiz is free. Further attempts cost tokens. Your best score counts — a replay can only improve your position, never worsen it.

7.2 Leaderboards. Leaderboards are per study country. Your display name and score are visible to other users on the board you are ranked on.

7.3 One board, one day. Your leaderboard entry is tied to the study country you had selected when the quiz opened. You can be ranked on one board per day.

7.4 Rewards. We may grant tokens to top-ranked players. Reward amounts, ranks and eligibility conditions are shown in the app and may change. Rewards are limited to one per user per day, however many boards you appear on, and may require a minimum number of participants on the board.

7.5 Fair play. You must not use automated play, modified clients, multiple accounts, shared accounts, or any other method of gaining an unfair advantage.

7.6 If we suspect manipulation. We may remove an entry, withhold a reward, void a board, or act under section 3.4. We will tell you if we do, and section 3.6 applies.

7.7 No entry fee is required. You can take part in Arena every day without paying anything.

8. ACCEPTABLE USE

8.1 The basic rule. Use Dūbu to study. Do not use it in a way that harms other users, harms us, or breaks the law.

8.2 Content. You must not extract, scrape, copy or redistribute our content in bulk, or resell access to it. Section 4.2 sets out the full limits of your licence.

8.3 Fair play. You must not manipulate quizzes, leaderboards, rewards or the token system. Section 7.5 sets out what this means in Arena.

8.4 Your display name. Your display name is visible to other users on leaderboards. It must not be obscene, hateful, harassing, or an impersonation of another person, a public official, a government body or us. We may remove a name that breaks this rule and ask you to change it in your Google account.

8.5 Security. You must not probe, scan or test the security of the app or our systems, interfere with their operation, attempt to access another user's account or data, or introduce malicious code.

8.6 Payments. You must not abuse refunds or chargebacks, or use payment methods you are not authorised to use.

8.7 Misrepresentation. You must not present Dūbu, or content taken from it, as official government material or as endorsed by any authority. Section 5 explains why this matters.

8.8 Reporting a problem. If you see a display name or any other behaviour that breaks this section, tell us at dubu@sulekhadd.app. We aim to look at reports within 5 working days.

8.9 What happens if you break this section. We may act under section 3.4, including removing an entry, withholding a reward, or suspending or closing the account. Section 3.5 explains what happens to what you have paid for, and section 3.6 gives you a right of appeal.

9. INTELLECTUAL PROPERTY AND SOURCE MATERIAL

9.1 What is ours. The Dūbu app, its software, design, brand and our original writing, editing, question design and selection are owned by SulekhaDD AB.

9.2 What is not ours. Much of our factual material derives from Wikipedia and other open sources. That material remains the property of its respective authors and is used under its own licence — most Wikipedia text is available under the Creative Commons Attribution-ShareAlike licence, and images may carry different licences again.

9.3 Attribution. Where content derives from a licensed source, we identify the source and its licence in the app, and we make derived text available on the same terms where the licence requires it. Our own original material and the app itself are not covered by those licences.

9.4 If you think we have got attribution wrong, please tell us at dubu@sulekhadd.app and we will correct it.

10. AVAILABILITY, CHANGES AND DISCONTINUATION

10.1 Availability. We work to keep Dūbu available, but we do not promise uninterrupted service. Maintenance, outages and problems at our providers can interrupt it.

10.2 Changes to the app. We may add, change or remove features so long as the change is reasonable and does not materially reduce what you have paid for. Where a change is material, we will give you notice in the app in advance.

10.3 If we withdraw something you paid for. If we permanently remove a deck you have unlocked, or a feature you can spend tokens on, and there is no equivalent replacement, we will credit you back what you paid for it — in tokens or in money — or refund it, at your choice, unless the law requires more.

10.4 If we discontinue Dūbu. If we decide to stop running the app, we will give at least 90 days' notice in the app and by email, stop selling tokens immediately, and give you a reasonable period to use what you have. Where you cannot reasonably use an unused balance in that period, we will refund it as required by law and will consider a refund in good faith otherwise.

11. YOUR CONSUMER RIGHTS

11.1 Your statutory rights stand. If you are a consumer in the EU/EEA, you have rights under mandatory law that these Terms do not limit or replace.

11.2 Right of withdrawal. You normally have 14 days to withdraw from a purchase of digital content. Because deck unlocks and tokens are made available to you immediately, we ask you at the point of purchase to expressly consent to immediate delivery and to acknowledge that you lose your right of withdrawal once delivery begins. If you do not give that consent, the purchase does not proceed.

11.3 Faults and conformity. Under the Swedish Consumer Sales Act (konsumentköplagen, 2022:260) and the Act on consumer protection for digital content and digital services (2022:255), what we sell you must conform to what was agreed, and we must supply updates needed to keep it in conformity. These obligations are not excluded or limited by section 12. If something you paid for does not work, contact us at dubu@sulekhadd.app and we will put it right.

11.4 Refunds. Refunds through the store follow that store's refund policy. That is separate from, and does not replace, your statutory rights against us.

11.5 If we cannot agree. Contact us first at dubu@sulekhadd.app — we aim to reply within 14 days. If we cannot resolve it, you can refer the matter to:

• Allmänna reklamationsnämnden (ARN), Box 174, 101 23 Stockholm, Sweden — arn.se. We undertake to take part in ARN proceedings and to follow ARN's recommendations. ARN charges a fee to file and only examines claims above a minimum value, which is higher than the price of most purchases in Dūbu — so please raise the matter with us first, as we would rather resolve it directly than have you pay to be told the claim is too small to hear.
• ECC Sverige (ecc.se), if you live in another EU country, Norway, Iceland or the UK.
• Your local consumer authority or the courts.

The EU Online Dispute Resolution platform closed on 20 July 2025 and is no longer available.

12. LIABILITY

12.1 Dūbu is provided as it is, and we do not give guarantees beyond those in these Terms and those you have by law.

12.2 To the extent permitted by law, we are not liable for indirect or consequential loss, or for loss arising from your reliance on study content contrary to section 5.

12.3 What we do not limit. Nothing in this section limits: your rights under section 11; liability for death or personal injury caused by negligence; liability for fraud; or any other liability that cannot be limited under Swedish or EU law.

13. INDEMNITY

If someone brings a claim against us because you have used Dūbu unlawfully, infringed their intellectual property or other rights, or seriously breached section 4.2 or section 8 (Acceptable Use), you agree to reimburse us for the loss we actually suffer as a direct result. This does not apply to anything caused by our own act or omission, it does not require you to conduct our defence, and it does not apply where you acted as a consumer without fault. We will tell you promptly of any such claim and will not settle it without giving you a chance to comment.

14. APP STORES AND THIRD-PARTY TERMS

Dūbu is distributed through app stores. The terms of the store you downloaded the app from, and its billing and refund rules, apply alongside these Terms. Those stores are not parties to these Terms and have no obligations to you under them. The app also incorporates third-party software and services provided under their own licences.

15. CHANGES TO THESE TERMS

15.1 We may update these Terms. When we make a material change, we will increase the version number and ask you to review and accept the updated Terms before continuing to use the app, giving you at least 30 days' notice of the change where the change is material and not required by law.

15.2 If you do not accept. You may decline and stop using Dūbu. If you decline, you may ask us within 90 days to refund the unused portion of anything you have paid for, and we will do so unless the change was required by law and does not disadvantage you.

15.3 Every version of these Terms is listed in the changelog below.

16. GOVERNING LAW

These Terms are governed by the laws of Sweden. If you are a consumer, the mandatory consumer-protection rules of your country of residence continue to apply and you keep the right to bring proceedings there. Disputes may otherwise be brought before the competent courts of Sweden.

17. CONTACT

SulekhaDD AB, 44244 Kungälv, Sweden Registration number 559597-8635 · VAT SE559597863501 Questions, complaints and content corrections: dubu@sulekhadd.app

VERSION HISTORY

Version 1.0 — 30-08-2026 — First published version of these Terms.