Terms of Service

1. About these terms

These Terms of Service govern your access to and use of Björn, a language-learning service operated by Musefuel AB (company registration number 559080-8720) ("Björn," "we," "our," or "us").

By creating an account, accessing the service, or using any Björn feature, you agree to these Terms. If you do not agree, do not use the service.

2. Eligibility

Björn is intended for users who are at least 16 years old. You may not use the service if you are under 16.

If you use Björn on behalf of a business or other organization, you represent that you have authority to bind that organization to these Terms.

3. Learning with Björn

Björn offers daily lessons, text and voice conversations, roleplay, pronunciation feedback, grammar practice, vocabulary and flashcards, imports, learning statistics, personalized coaching and AI Pen Pals. Features and limits differ by platform, plan and device.

Pen Pals are fictional AI characters. Their replies and enclosures are generated, and delivery delays are simulated. They are not human correspondents, and letters are not sent through a postal service. Virtual stamps have no cash or postal value. Response times and generated content can vary.

Björn Translate uses your existing Björn account. Its app-specific terms and privacy notice explain its use alongside these account terms.

4. The Björn Chrome extension

The Björn Chrome extension lets you look up words on websites you visit, save them to your Björn decks and, if you turn it on, get writing help in text fields. It uses your Björn account, so these terms apply to it. The extension is free to install. The AI it uses counts toward your plan's usage limits, as the same features do on the website.

The extension works on websites run by others. Their terms still apply when you use them, and we are not responsible for their content. Some websites, editors and browser pages don't let extensions read or change text, so it won't work everywhere.

Writing help is off until you turn it on. The extension changes text in a field only when you choose a suggestion, and never submits forms or sends messages for you. Check text before you send or publish it.

Don't use the extension on material you aren't allowed to share with third parties, such as confidential work documents. You can turn it off for any website from its popup, or remove it from Chrome at any time.

You install the extension from the Chrome Web Store, whose terms also apply to the installation. We update the extension through the store, as described under Availability and service changes.

5. Accounts and authentication

You must provide accurate and current information when creating an account and keep your account credentials secure.

• You are responsible for activity that occurs under your account.
• You must promptly notify us if you believe your account has been accessed without authorization.
• We may support sign-in methods such as email codes, Google, and Sign in with Apple.

6. Subscriptions and purchases

The offer and checkout show the price, currency, billing period and relevant plan or purchase limits. Web purchases are processed through the provider shown at checkout, currently Polar. Purchases through the iOS app are billed by Apple, with RevenueCat helping synchronize entitlements.

Subscriptions renew automatically unless canceled through the purchase source before its renewal deadline. You can manage web billing through the available billing controls and Apple purchases through Apple subscription settings. Contact hey@heybjorn.com if you need help identifying or managing your purchase.

Canceling renewal normally leaves access available until the end of the paid period shown by your purchase source. Deleting your account removes account access and is a separate action. Deleting a Björn account does not cancel an Apple subscription.

Extra credits provide the usage described at purchase. Any applicable usage limits, validity period or expiration must be disclosed with the offer. Mandatory consumer rights apply to both subscriptions and credits.

7. Withdrawal, refunds and problems with the service

If you are an EEA consumer purchasing at a distance, you generally have a 14-day right to withdraw from the contract, starting when the contract is concluded. Exceptions and the consequences of starting supply depend on whether the purchase is a digital service or digital content and on the express requests and acknowledgments given at checkout.

Starting to use an ongoing subscription does not by itself remove every withdrawal right. Where you expressly request that a service start during the withdrawal period, a proportionate charge may apply as permitted by law. For digital content supplied immediately, the withdrawal right is lost only when the applicable legal conditions, including express consent and acknowledgment, are met.

To tell us you wish to withdraw, email hey@heybjorn.com with a clear statement and enough information to identify your purchase. You may use an applicable statutory withdrawal form, but it is not required. For purchases billed by Apple or another seller, use its refund process as well; we can help identify the correct route.

Outside statutory rights, refunds follow the purchase terms presented by the seller. No statement that credits are non-refundable overrides a legal entitlement to a refund.

If the service is faulty or not supplied as agreed, contact us. Depending on applicable law, you may be entitled to correction, a price reduction or termination and a refund. Nothing in these terms limits mandatory consumer remedies.

8. Usage limits and acceptable learning use

Your plan may have limits on activities, storage or voice usage. Applicable limits are described in the plan or feature. Generous usage or unlimited learning descriptions do not authorize automated consumption, resale or abuse, and do not override specific limits disclosed for a feature.

Do not share individual paid access across users, scrape the service, bypass limits or use automated requests to consume disproportionate resources. We may apply proportionate restrictions to protect service reliability and prevent fraud or abuse.

9. Acceptable use

You may not use Björn to:

• violate law or third-party rights;
• harass, threaten, exploit, or abuse others;
• submit malicious code or interfere with service security or availability;
• attempt unauthorized access, reverse engineer protected parts of the service, or bypass limits;
• generate or store unlawful, harmful, or infringing content through the service.

10. AI, voice, and third-party services

Björn relies on third-party providers for important parts of the service, including AI generation, transcription, speech generation, hosting, payments, email delivery, video, and platform billing.

These providers may include OpenRouter, its model providers, ElevenLabs, Apple, RevenueCat, Polar, Amazon Web Services, Resend, Google Sign-In, and YouTube.

AI-generated output can be inaccurate, incomplete, unexpected, or inappropriate. Björn is an educational tool, not a source of professional advice or guaranteed factual accuracy.

11. Your content and intellectual property

You retain ownership of the content you submit to Björn, such as saved words, notes, flashcards, lesson input, pronunciation submissions, Pen Pal letters, and other learning materials. You must have the rights needed to upload or import material, including decks and third-party content.

You grant us a limited, non-exclusive, worldwide license to host, process, reproduce, adapt, transmit, and store that content only as needed to provide the features you use, personalize your learning, secure the service and support you. This license does not replace the legal bases and rights described in our Privacy Policy.

Björn, our branding, our software, and our original service content remain our property or the property of our licensors.

12. Privacy

Our Privacy Policy explains how we process your information, including recordings, letters and learning memories, and how to exercise your data protection rights. Agreeing to these terms does not provide blanket consent to optional marketing or unrelated processing.

13. Suspension, termination, and deletion

You may stop using Björn at any time. We may suspend or terminate access if you violate these Terms, misuse the service, create legal risk, or threaten service integrity or other users.

You may delete your account in Björn Translate (open Account and choose Delete account) or by contacting hey@heybjorn.com. Some information may still be retained where required for billing, tax, accounting, security, fraud prevention, dispute resolution, or other legal reasons.

14. Availability and service changes

We maintain and update Björn to fix problems, improve compatibility and security, meet legal requirements and develop learning features. Temporary interruptions can occur, including when a provider is unavailable. This does not remove our obligations under applicable consumer law.

For paid digital services, changes beyond those needed to maintain conformity will be made only where permitted by the contract and applicable law, for a valid reason, and without additional cost unless you agree otherwise. We will give clear information about changes and advance notice on a durable medium, such as email, where required.

If a change negatively affects your access or use beyond a minor extent, you retain applicable rights to terminate without charge or other remedies. Price changes will be communicated before they apply, with an opportunity to cancel renewal. We will not use a terms update to retrospectively remove rights relating to an existing purchase.

15. Educational limitations

AI replies, translations, pronunciation scores and Coach suggestions can be inaccurate or inappropriate. Check information before relying on it. Björn provides learning practice, not professional advice, an official proficiency certificate or a guarantee of a particular learning outcome.

Third-party videos, maps and other material may change or become unavailable. Their use remains subject to applicable rights and platform terms. These limitations do not exclude statutory guarantees that apply to the service you purchased.

16. Limitation of liability

To the maximum extent permitted by law, Musefuel AB and its affiliates, officers, employees, contractors, and licensors will not be liable for indirect, incidental, special, consequential, exemplary, or punitive damages, or for loss of profits, revenue, goodwill, use, or data, arising from or related to your use of Björn.

Nothing in these Terms excludes liability that cannot be excluded under applicable law.

17. Governing law

These Terms are governed by the laws of Sweden, without regard to conflict-of-law rules. Mandatory consumer protection rights that apply in your country of residence remain unaffected where required by law.

18. Changes to these terms

We may update these terms to reflect changes in the service or law. We will communicate material changes and their effective date through the service or by email in advance where required. Where a change requires your agreement, we will obtain it. Your rights concerning changes to paid services are described above.

19. Contact

Musefuel AB (559080-8720)

Email: hey@heybjorn.com