As of: 27 April 2026
Welcome to V‑IZ! The terms "we", "us" and "our" refer to V‑IZ. V‑IZ operates this website (v-iz.de), the related web application (app.v-iz.de) and a mobile app for iOS and Android (collectively the "Services"), including all related information, content, features, tools and products. V‑IZ uses various technical interfaces to third-party providers (in particular Stripe for payment processing and subscription management of web purchases, RevenueCat for managing in-app subscriptions, and Supabase for account and data storage), enabling us to provide the Services to you fully and automatically.
The following terms and conditions (these "General Terms and Conditions" or "Terms") govern the contractual relationship between V‑IZ and you as the user.
DEFINITIONS AND ORDER OF PRECEDENCE
For better understanding, the following definitions apply:
(a) "Digital Content" means data that is produced and supplied in digital form (in particular video courses, downloads).
(b) "Digital Services" means services that enable the creation, processing or storage of data in digital form, or access to such data (in particular cloud-based AI analyses, exam simulations).
(c) "Physical Goods" means tangible items that are sent by post (in particular the accompanying book).
In case of conflict, the following order of precedence applies: (1) these Terms, (2) product- or feature-specific special terms (e.g. on the product page), (3) general service descriptions. The privacy notice governs only the data processing.
These Terms become part of the contract by your active consent during the order process or App use. You may view, download and print these Terms at any time at v-iz.de/policies/terms-of-service. Our Privacy Policy applies in addition.
SECTION 1 – ACCESS, ACCOUNT AND SECURITY
1.1 Capacity to Contract: By accepting these Terms, you confirm that you are at least 18 years old or — if you are a minor — that you have the express consent of your legal guardian to use the Services.
1.2 Account Obligations and Automation: Use of the Services requires a user account. You undertake to provide truthful information (in particular a valid e-mail address). Since we handle registration and activation through automated technical services (e-mail magic-link, app-store contract handling), a correct e-mail address is technically essential for performance of the contract.
1.3 No Account Sharing (Single-User License): Access is strictly personal. Sharing access credentials with third parties is prohibited.
1.4 Suspension Procedure (Security Review): In the event of suspected abuse (e.g. account sharing) we are entitled to provisionally suspend access. We evaluate system logs (e.g. timestamps, access logs, device-ID hashes) which serve as significant and traceable indications for our decision. Within a Security Review you have the opportunity to refute the suspicion by submitting a statement and suitable evidence. If the breach is confirmed, in case of serious or repeated violations a permanent suspension follows.
SECTION 2 – OUR PRODUCTS & SYSTEM REQUIREMENTS
2.1 AI Disclaimer: Our App uses Artificial Intelligence (AI). AI-generated content can be flawed ("hallucinations") and is intended exclusively for practice purposes. It does not replace a qualified language teacher.
2.2 Hardware Access: For the AI language trainer, our web application and mobile app require access to your microphone (and, in the mobile app for premium features, additionally to the camera/photo gallery for photo corrections). Before initial access, the browser or operating system (iOS / Android) requests your express permission via the respective system dialog. You may revoke or re-grant this permission at any time in your browser or device settings. Refusal will result in individual functions being unavailable or limited; the remaining features (videos, writing trainer, quizzes) remain available.
2.3 No Guarantee of Success: We do not guarantee success in official examinations (e.g. TELC, Goethe-Institut, ÖSD).
2.4 System Manipulation: The functionality of the Services (in particular exam simulations and the AI trainer) is not guaranteed if you use them through manipulated browser environments or devices with manipulated operating systems (e.g. "jailbreak", "rooting"). We reserve the right to restrict the service on such environments for security reasons.
SECTION 3 – CONCLUSION OF CONTRACT
3.1 Website Purchases (v-iz.de): The contract is concluded with our order confirmation by e-mail or with the activation of your access. With the conclusion of the V‑IZ Subscription, a recurring payment mandate is granted in favour of our payment service provider Stripe.
3.2 In-App Purchases (Apple App Store / Google Play Store): If you purchase additional features or feature-specific subscriptions within our mobile app via the Apple App Store or the Google Play Store, the contract is concluded directly with the respective app-store operator (Apple Distribution International Limited or Google Commerce Limited). Their purchase and subscription terms apply additionally.
SECTION 4 – PRICES AND PAYMENT TERMS
4.1 Prices: All prices stated include applicable statutory VAT. For in-app purchases, the price matrices of the app stores in your local currency apply.
4.2 Payment Methods Website (v-iz.de): For orders via our website, we offer various payment methods, including credit card (Visa, Mastercard, American Express), SEPA Direct Debit, PayPal, Klarna and Apple Pay / Google Pay. Payment processing as well as recurring subscription payments are handled via our payment service provider Stripe (Stripe Payments Europe Limited, Ireland). The payment methods available in the respective order process are transparently displayed before completion of the order.
4.3 Payment Methods In-App (Apple App Store / Google Play Store): For in-app purchases, only the payment methods stored in your Apple ID or Google Account apply. Billing is handled directly by the respective app-store operator.
4.4 Recurring Payments (V‑IZ Subscription via Website): By concluding the V‑IZ Subscription you authorise Stripe to debit the monthly subscription amounts in advance from your stored payment method until you cancel the subscription. During the 7-day free trial (Day 1–7) no debit takes place; the first billing happens automatically on Day 8 (see Section 5.1.0). Subsequent billing takes place at the beginning of each new monthly period.
SECTION 4a – RETENTION OF TITLE
For physical goods (e.g. accompanying books), the delivered goods remain our property until full payment of all claims under the contract.
The accompanying book is part of the contract package as a price-controlled textbook (Hueber Verlag, "Schritte plus Neu") and is shown in the package at the legally fixed retail price.
SECTION 4b – SHIPPING AND DELIVERY (PHYSICAL GOODS)
To the extent that your contract includes physical goods (e.g. the accompanying book), shipping is to the delivery address you provided during the order process. The expected delivery times and applicable shipping costs are clearly communicated to you before the conclusion of the order. Detailed information can be found on our separate shipping conditions page.
SECTION 5 – V‑IZ SUBSCRIPTION, IN-APP SUBSCRIPTIONS, ACCOMPANYING BOOKS & REFUNDS
5.1 V‑IZ Subscription (monthly, Website): Access to the video course, AI trainer and all learning features via the web application (app.v-iz.de) is provided as a monthly billing subscription. The price is currently 19,99 € per month (incl. VAT). The subscription renews automatically by one further month at a time until you cancel.
5.1.0 7-Day Free Trial: When you first conclude a V‑IZ Subscription, you start with a 7-day free trial. The conditions in detail:
- Eligibility: The trial is available only once per person and e-mail address. For a later level upgrade (A1 → A2 → B1) or for re-activation after prior cancellation, billing takes place immediately on Day 1 without a trial phase. Eligibility is checked before checkout via a Stripe Customer Lookup and a "had_trial" metadata flag.
- Full access from Day 1: Upon completion of the order, you immediately receive full access to the video course, AI trainer and all learning features. During the 7-day trial no money is debited from your stored card.
- Day 8 — automatic charge (§ 312j Abs. 3 BGB): Unless you cancel beforehand, on Day 8 Stripe automatically charges 19,99 € for the first subscription period from your stored card. You complete your order subject to payment. This auto-charge mechanic is clearly disclosed to you before order completion (cart sub-line, order confirmation).
- 1-click cancellation in the account portal: You can end the trial at any time during the 7 days with a single click in the account portal. Effects: no charge on Day 8, full access remains until the end of Day 7, no refund needed.
- Payment methods during the trial: During the trial flow we accept exclusively card-based payment methods (credit card, Apple Pay, Google Pay, Stripe Link). SEPA Direct Debit and Klarna only become available in the running subscription.
5.1.1 Cancellation: You can cancel your V‑IZ Subscription at any time with one click in the customer portal. There is no minimum contract term. During the 7-day trial: cancellation ends the subscription at the end of Day 7 without any charge. After Day 8 (running subscription): the cancellation takes effect at the end of the already paid billing period; you retain full access to the course until then. Cancellation by e-mail to info@v-iz.de is also possible.
5.1.2 Change Payment Method, Retrieve Invoices: You manage your payment methods and retrieve invoices yourself at any time via the customer portal, which we provide together with our payment service provider Stripe.
5.1.3 Price Changes for Existing Subscriptions: Any price increases for an existing subscription are communicated to you in text form at least 30 days in advance. In this case you have an extraordinary right of cancellation effective at the time of the price change (see Section 22).
5.2 In-App Subscriptions (mobile app via Apple App Store / Google Play Store): Through our mobile app, additional feature-specific subscriptions (e.g. extended AI features, tokens) can be purchased. These subscriptions are independent of the V‑IZ Subscription on the website and are processed exclusively via the respective app store.
- Term and Renewal: In-app subscriptions are concluded with the term selected in the respective app store and renew automatically for the original term unless you cancel at least 24 hours before the end of the running period.
- Management and Cancellation: Management of your in-app subscription (cancellation, payment methods, renewals) takes place exclusively via the subscription management of the respective app store (settings of your Apple or Google account). V‑IZ has no technical access to these processes and cannot cancel or adjust in-app subscriptions for you.
- Refunds: We cannot technically directly process refunds for in-app purchases. Please address refund requests directly to Apple or Google.
5.3 Accompanying Books (one-time purchase): The Hueber accompanying books ("Schritte plus Neu") associated with the course are offered separately from the subscription as a one-time purchase and can optionally be purchased as physical books (shipping to Germany and Austria, see shipping conditions) or as a digital Hueber activation code (by e-mail, worldwide). The purchase of the books is not recurring; no separate cancellation is required. The books belong to you permanently, regardless of the status of your subscription.
5.4 Chargebacks: In the case of chargebacks that, after our justified review, are not justified by an actual deficiency of the service, we are entitled to suspend the account provisionally until the claim is clarified. You have the right to set out your view in text form; we review your statement within a reasonable period. If the chargeback is justified (e.g. due to a fault on our part), we lift the suspension immediately and refund any amounts overpaid.
5.5 Right of Withdrawal and Trial-Cancel Mechanic: Consumers have a statutory right of withdrawal. For the V‑IZ Subscription, the 1-click trial-cancel mechanic according to Section 5.1.0 additionally applies during the first 7 days. All details on deadlines, the early expiry of the right of withdrawal for digital services (V‑IZ platform, § 356 Abs. 4 BGB) and digital content (Hueber code, § 356 Abs. 5 BGB) as well as on the 14-day right of withdrawal for physical accompanying books (§ 312g BGB) can be found in our separate Withdrawal Policy.
SECTION 6 – INTELLECTUAL PROPERTY
6.1 Rights of Use: You receive a simple, non-transferable right of use for personal, non-commercial use of the provided content for the duration of the contract. Screen recordings, recordings as well as the duplication or transfer of content to third parties are prohibited.
6.2 Prohibition of Circumvention: The circumvention of technical protection measures (DRM, access restrictions, authentication) is prohibited and may lead to immediate suspension of the account.
SECTION 7 – TECHNICAL INFRASTRUCTURE
To perform the contract we use various service providers, in particular Stripe (payment processing and subscription management for web purchases), Supabase (database, authentication and backend), RevenueCat (management of in-app subscriptions in the mobile app), Resend (transactional e-mails such as order confirmations, login links and invoices), Netlify (hosting of the website) and AI providers (e.g. OpenAI) for speech and text analyses in our AI trainer features. Details on data-protection processing and international transfers can be found in our Privacy Policy.
SECTION 8 – LINKS FROM THIRD PARTIES
Our Services may contain links to external websites whose content is the responsibility of third parties. We have no influence over the content of these websites; liability is excluded.
SECTION 9 – RELATIONSHIP WITH STRIPE
Stripe Payments Europe Limited (Ireland) handles payments and the management of recurring subscription payments for us. Stripe is not a contractual partner for the services offered by V‑IZ; all contractual relationships via v-iz.de exist exclusively between you and V‑IZ. Payment processing itself is additionally subject to Stripe's terms of use.
SECTION 10 – DATA PROTECTION
The processing of your personal data takes place in accordance with our Privacy Policy.
SECTION 11 – COMMUNITY GUIDELINES
In our community areas (e.g. forum, Discord group, comment functions) rules of respectful interaction apply. The following are in particular prohibited:
- hate speech, discrimination, insults towards other users or staff;
- racist, sexist, extremist or incitement-related content;
- spam, phishing, advertising for other services;
- publication of personal data of third parties without their consent;
- distribution of copyright-protected materials of third parties.
For violations we provide the following sanctions depending on severity: (1) notice/warning, (2) temporary exclusion from the community areas, (3) for repeated or severe violations, permanent suspension of the account. In the case of a justified permanent suspension due to violation of these guidelines, no claim for refund of amounts already paid arises.
SECTION 12 – AVAILABILITY
We strive for the highest possible availability of the Services and aim for an availability of at least 95% on annual average. Excluded from this are:
- scheduled maintenance windows (where possible outside common usage hours);
- outages of third-party providers (hosting, payment processors, AI APIs) for which we are not responsible;
- events of force majeure;
- impairments on the user's side (e.g. internet connection, end device).
100% availability is not assured. Short-term impairments do not give rise to a refund claim.
SECTION 13 – PROHIBITED USES
The following are in particular prohibited:
- reverse engineering, decompiling, disassembling the App or platform;
- crawling, scraping or automated reading of our content;
- use of bots, scripts or other automated tools that are not expressly provided for by us;
- account sharing or transferring access credentials to third parties;
- multiple registrations with the aim of using the 7-day free trial multiple times (see Section 5.1.0 Eligibility);
- circumvention of technical access or protection measures;
- downloading, duplicating or sharing content outside the intended mechanisms;
- use of the Services for unlawful purposes.
For violations we reserve the measures under Section 14.
SECTION 14 – TERMINATION
14.1 Ordinary Termination: You may cancel the V‑IZ Subscription (website) at any time pursuant to Section 5.1.1; it ends at the end of the already paid billing period. You cancel in-app subscriptions pursuant to Section 5.2 directly in the respective app store. One-time purchases (e.g. accompanying books) are fully performed upon delivery or upon provision of the activation code and end accordingly.
14.2 Extraordinary Termination / Suspension by V‑IZ: We may extraordinarily terminate a contract or suspend access for important reasons. Important reasons are in particular significant or repeated violations of these Terms (e.g. account sharing, violation of community guidelines, prohibited uses pursuant to Section 13). Before a permanent suspension you will receive — except in cases of particularly severe violations or imminent danger — a warning and an opportunity to comment.
14.3 Consequences of Termination: In the case of an extraordinary termination for which you are responsible (in particular for violation of these Terms), no claim for refund of amounts already paid for the remaining period arises. This does not apply if the termination is our responsibility; in this case we will refund you the proportionate amount for the unused period.
14.4 Extraordinary Termination by You: Your right to extraordinary termination for important reasons remains unaffected.
SECTION 15 – STATUTORY LIABILITY FOR DEFECTS (WARRANTY)
For the purchase of physical goods as well as digital products and services via our web shop, the statutory liability for defects (warranty) applies. A guarantee for passing official examinations (e.g. TELC, Goethe-Institut, ÖSD) through use of our Services is expressly not assumed. Use of the practice tools is therefore at your own risk.
SECTION 16 – LIMITATION OF LIABILITY
16.1 Unlimited Liability: We are liable without limitation for intent, gross negligence and for injury to life, body or health and under the Product Liability Act.
16.2 Cardinal Obligations: For slight negligence, we are liable only for breach of essential contractual obligations (cardinal obligations). Liability is in this case limited to typical, foreseeable damage.
16.3 Exclusion: Insofar as legally permissible, any further liability is excluded.
SECTION 17 – INDEMNIFICATION
You shall indemnify V‑IZ against justified claims of third parties arising from your culpable violation of these Terms or applicable law. We will inform you of such claims without undue delay.
SECTION 18 – SEVERABILITY CLAUSE
Should individual provisions of these Terms be or become invalid in whole or in part, the validity of the remaining provisions remains unaffected. The statutory provision shall apply in place of the invalid provision.
SECTION 19 – ENTIRE AGREEMENT
These Terms, together with the Withdrawal Policy, the Privacy Policy and any product-specific special terms, govern the entire legal relationship between you and V‑IZ. There are no oral side agreements.
SECTION 20 – ASSIGNMENT
An assignment of your rights and obligations under this contract to third parties requires our prior written consent. V‑IZ may transfer rights and obligations under this contract to a legal successor in the context of a transfer of business; your right to extraordinary termination remains unaffected in this case.
SECTION 21 – APPLICABLE LAW AND JURISDICTION
German law applies under exclusion of the UN Convention on Contracts for the International Sale of Goods.
For consumers: The statutory places of jurisdiction apply. Mandatory consumer protection provisions of your country of habitual residence within the EU remain unaffected (Art. 6 Rome I Regulation).
For merchants, legal entities under public law or special funds under public law: The exclusive place of jurisdiction for all disputes from this contract is Mannheim.
SECTION 22 – CHANGES TO THE TERMS
22.1 Material Changes: Material changes to these Terms, in particular those that shift the contractual balance to your disadvantage (e.g. noticeable price increases, reduction of the scope of services), require your express consent.
22.2 Other Changes: Other changes, in particular clarifying changes or those required for legal, technical or regulatory reasons, will be communicated to you in text form (e.g. by e-mail) at least 30 days before they take effect. You may object to the changes in text form before they take effect. In the event of an objection, we may end the contract effective at the time the changes take effect, insofar as continuation without the change is unreasonable for us; in this case, we will refund amounts already paid proportionately for the unused period.
22.3 Notice in the Change Notification: We will inform you separately of the right to object and the consequences in the change notification.
SECTION 23 – CONTACT INFORMATION
V‑IZ Video-Integrationszentrum
Owner: Fuat Karacocuk
S 3, 2A
68161 Mannheim
Germany
E-mail: info@v-iz.de
SECTION 24 – DISPUTE RESOLUTION
The European Commission provides a platform for online dispute resolution (ODR) which you can find here: https://ec.europa.eu/consumers/odr/. We are neither willing nor obliged to participate in dispute resolution proceedings before a consumer arbitration board.