Effective date: 24 May 2026
These Terms of Service (“Terms”) govern your use of the Charles mobile application (“Charles”, “the App”) and all related services provided by:
ViaVia UG (haftungsbeschränkt) Marchgrabenplatz 4 80805 München, Germany
Commercial Register: Amtsgericht München, HRB 308987 Managing Director: Klemen Kocic Email: info@viavia.travel
By downloading, installing, or using the App, you agree to these Terms. If you do not agree, do not use the App.
Charles is an AI-powered strength training application that generates personalised training plans based on your fitness assessment. The App provides:
You must be at least 13 years of age to use Charles. If you are between 13 and 17 years of age, you confirm that you have the consent of a parent or legal guardian to use the App. We reserve the right to request proof of age or parental consent at any time.
New users are eligible for a 7-day free trial of Charles Pro. The trial provides full access to all features. If you do not cancel before the trial period ends, your subscription will automatically begin and you will be charged.
Charles Pro is available at the following prices:
Prices are inclusive of applicable VAT. Actual prices may vary by country and currency based on App Store or Play Store pricing.
We may change subscription prices with at least 30 days’ advance notice. Price changes do not affect the current billing period. You will be notified of any price changes before they take effect, and continued use after the change constitutes acceptance of the new price. If you do not agree to the new price, you may cancel your subscription before the change takes effect.
Refunds for in-app purchases and subscriptions are handled by the respective app store according to their refund policies:
We do not process refunds directly for store-billed purchases.
As a consumer in the European Union, you have the right to withdraw from the contract within 14 days without giving any reason. The withdrawal period begins on the day the contract is concluded.
To exercise your right of withdrawal, inform us by a clear statement (e.g., email to info@viavia.travel) of your decision to withdraw.
Upon withdrawal, we will refund all payments received from you without undue delay and no later than 14 days from the day we received your withdrawal notice. We will use the same means of payment you used for the original transaction.
For digital content not delivered on a physical medium: You expressly consent to us beginning contract performance before the withdrawal period expires, and you acknowledge that you lose your right of withdrawal once performance has begun (ss 356 Abs. 5 BGB).
We will provide you with confirmation of this consent on a durable medium (email) after contract conclusion.
For digital services: The withdrawal right expires when the service has been fully performed, provided we began performance with your express prior consent and your acknowledgment that the withdrawal right expires upon full performance (ss 356 Abs. 4 BGB).
IMPORTANT: Please read this section carefully.
You retain all rights to the data you provide through the App, including your assessment responses, workout logs, and feedback. By using the App, you grant us a limited, non-exclusive, worldwide licence to process your data solely to provide the App’s functionality to you.
We do not claim ownership of your data. We do not sell your data to third parties. We do not use your data for advertising purposes.
Your assessment data and training history are processed by AI (Google Gemini API) to generate and refine your training plans. Only data necessary for plan generation is transmitted to the AI model. No personally identifiable information (such as your email address or name) is sent to the AI. For full details, see our Privacy Policy.
You can delete your account and all associated data at any time through the Account section of the App. Upon deletion, all your personal data is permanently removed, subject to legal retention obligations as described in our Privacy Policy.
The App, including its design, user interface, code, logos, training methodologies, exercise programming logic, brand elements, and all documentation, is owned by ViaVia UG and protected by copyright and other intellectual property laws. You may not copy, modify, distribute, decompile, reverse engineer, or create derivative works from any part of the App.
Exercise demonstration animations and data used in Charles are licensed from third-party providers. These materials are provided for your personal, non-commercial use within the App only. You may not download, redistribute, or use these materials outside of the App.
If you provide us with suggestions, ideas, or feedback about the App, you grant us a non-exclusive, royalty-free, worldwide licence to use, modify, and incorporate such feedback into the App without obligation to you.
You may not:
We are liable without limitation for:
For slight negligence (leichte Fahrlassigkeit) in the breach of material contractual obligations (Kardinalpflichten), our liability is limited to the foreseeable, typically occurring damages. Material contractual obligations are those whose fulfilment is essential for the proper execution of the contract and on whose compliance the contractual partner may regularly rely.
Beyond the cases described in sections 12.1 and 12.2, liability for slight negligence is excluded.
This limitation of liability also applies to our legal representatives, employees, and vicarious agents (Erfullungsgehilfen).
To the extent permitted by applicable law, you agree to indemnify and hold harmless ViaVia UG, its directors, employees, and agents from and against any claims, damages, losses, liabilities, costs, and expenses (including reasonable legal fees) arising out of or related to:
This indemnification obligation does not apply to the extent that you are not responsible for the relevant breach or violation.
We strive to maintain the App’s availability but do not guarantee uninterrupted access. We may temporarily suspend the App for maintenance, updates, security patches, or circumstances beyond our control. We will provide advance notice where reasonably possible.
We reserve the right to modify, update, or discontinue features of the App at any time. Material changes to core functionality will be communicated with reasonable notice.
These Terms are governed by the laws of the Federal Republic of Germany, excluding the UN Convention on Contracts for the International Sale of Goods (CISG).
For consumers: Mandatory consumer protection provisions of your country of residence apply where they provide greater protection. You may bring proceedings in the courts at your place of residence or before the courts of Munich.
For businesses: The exclusive place of jurisdiction is Munich, Germany (AG München for claims up to EUR 5,000; LG München I for claims above EUR 5,000).
The European Commission provides an Online Dispute Resolution (ODR) platform at https://ec.europa.eu/consumers/odr. We are neither obliged nor willing to participate in dispute resolution proceedings before a consumer arbitration board.
We may modify these Terms with at least 30 days’ advance notice via email or in-app notification. If you do not agree to the modified Terms, you may terminate your account before they take effect. Continued use of the App after the effective date constitutes acceptance of the modified Terms.
If any provision of these Terms is found to be invalid or unenforceable by a court of competent jurisdiction, the remaining provisions remain in full force and effect. The invalid provision shall be replaced by a valid provision that most closely reflects its economic intent.
These Terms, together with our Privacy Policy and Impressum, constitute the entire agreement between you and ViaVia UG regarding your use of the App and supersede all prior agreements and understandings.
For questions about these Terms:
ViaVia UG (haftungsbeschränkt) Marchgrabenplatz 4 80805 München, Germany Email: info@viavia.travel