Terms of Service

Last updated: September 7, 2026

1. Purpose

These Terms govern your use of Cantilena (the “Service”), an AI text-to-speech product operated by Spatzen (the “Company”), and the rights and responsibilities between you and the Company.

2. Accounts

① You must provide accurate account information and keep it up to date. ② You are responsible for safeguarding your credentials; contact us if you suspect unauthorized use. ③ You may close your account through the in-app flow. On closure, the account, unused complimentary credits, and access to the Service end. Closure does not limit any refund claim for paid credits under applicable law or the Refund Policy. ④ We may restrict or terminate accounts that violate these Terms, the Refund Policy, or applicable law.

3. Nature of the Service

① Cantilena is a text-to-speech SaaS. It generates speech from text you enter, using synthetic AI voices that the Service provides or that you design inside the Service. ② The Service does not provide voice cloning. You cannot upload a recording of a real person to reproduce or imitate that person’s voice. ③ The Service is not for cloning or impersonating celebrities, public figures, politicians, or any other real person. ④ Voice-design prompts that name a real person and ask the Service to speak like that person are prohibited. We may refuse or limit those requests. ⑤ Outputs are AI-generated synthetic audio, not recordings of a real person. Files may include operational metadata (file ID, created-at, and similar). You may not remove or alter it. ⑥ Features, pricing, and credits follow in-product notices and the paid-checkout terms. ⑦ If we need to change or discontinue features, we will give reasonable prior notice, except for urgent outages, security issues, or legal reasons. If a material change makes paid credits hard to use, we will take steps such as refunding remaining paid credits under applicable law and the Refund Policy. ⑧ Per-request character limits are an operational control for cost and abuse. They do not make copyright infringement or illegal use lawful.

4. AI outputs and use scope

① Audio and related outputs are produced automatically by AI models. ② We do not guarantee pronunciation, prosody, naturalness, accuracy, or completeness. ③ Review outputs before use or distribution, especially for broadcast, ads, or official communications. ④ Audio you lawfully generate and download may be used for personal and commercial purposes within these Terms, applicable law, and third-party rights — including YouTube, social media, ads, paid content, and narration. The same applies to signup-bonus credits. We do not warrant exclusivity, copyright subsistence, or non-infringement. ⑤ You may not resell, rent, or transfer outputs, credits, or accounts, or provide outputs as training data for a similar TTS service. ⑥ You are primarily responsible for your inputs and how you use outputs. That does not remove duties the Company still has under applicable law.

5. User content and third-party rights

① You must have the lawful right and authority to use the text, prompts, and other materials you submit. ② You may not submit third-party copyrighted works (books, articles, scripts, paid content, or someone else’s writing) without permission. ③ You may not submit another person’s name, likeness, voice, publicity rights, trademarks, or personal data without lawful authority, or use the Service for impersonation or deepfakes. ④ If a rights holder reports infringement or we find it, we may limit generation, delete files, or suspend the account. Reports: in-app support or cantilena.spatzen@gmail.com. ⑤ We may store, transmit, and process inputs and outputs as needed to provide the Service, for security, incident response, abuse prevention, and records. We do not train our own AI models on your personal data. If that changes, we will disclose it in the Privacy Policy or a consent screen.

6. Prohibited use and enforcement

You must not: ① Clone voices, upload a real person’s audio, or impersonate a real person (including celebrities and public figures) ② Use voice-design prompts that name a real person and ask the Service to sound like them ③ Use the Service for fraud, phishing, threats, illegal activity, hate speech, illegal sexual content, or deceptive content ④ Violate law or infringe others’ rights, including deepfakes ⑤ Disrupt the Service or abuse systems ⑥ Use another person’s account or payment method without authorization We may refuse or limit requests through automated or human review, and suspend accounts for serious or repeated violations. If we receive a lawful request for a criminal investigation, prosecution, trial, or other grounds set by law, we may provide account information, contact details, generation/download records, and file identifiers, limited to what is necessary.

7. Paid credits and payment methods

① Paid credits are prepaid digital units. Deduction rules follow in-product guidance. ② Customers in Korea may pay in KRW via Kakao Pay. For those purchases the Company is the seller, and the listed KRW price includes VAT. ③ When the Company offers Paddle checkout to international customers, the Paddle contracting entity for the buyer’s location is the Merchant of Record (seller / authorised reseller). It charges you, handles related tax, and issues the receipt. The Company is the Supplier of the product and Service. Paddle purchases are also subject to the Paddle Buyer Terms and Paddle Refund Policy. ④ The default method may follow your location; you may switch if the Service allows it. ⑤ USD (and other non-KRW) prices may be shown excluding tax. Tax may be added at checkout depending on your location. The checkout amount is controlling.

8. Withdrawal and refunds

Refunds depend on the payment method. See the Refund Policy. ① Kakao Pay (KRW): under Korea’s e-commerce consumer law, you may request withdrawal within 7 days of payment for unused paid credits. Used credits may be excluded because supply of digital content has begun. ② Paddle: Paddle is the seller. Whether a refund or withdrawal is available, and for how long, depends on the buyer’s country or region, applicable consumer law, and the Paddle Refund Policy. Even where no statutory withdrawal right applies, Paddle may approve a discretionary refund under its policy. Once use of the digital content or service has started, statutory withdrawal may be limited depending on the buyer’s location, applicable law, and any consent given during checkout. Refunds of Paddle charges are processed through Paddle. ③ Verified duplicate or erroneous charges are cancelled in full. Kakao Pay cancellations are handled by the Company; Paddle cancellations are handled through Paddle.

9. Content review

We may review text and prompts automatically or manually to reduce fraud, illegal use, impersonation, hate, and rights infringement. We may refuse generation or restrict accounts. Review does not catch every unlawful or infringing use in advance.

10. Limitation of liability

① To the extent permitted by law, we are not liable for failures caused by force majeure, network issues, or third-party AI/infrastructure outages. ② Except for willful misconduct or gross negligence, our liability related to AI output quality, errors, or misuse is limited as allowed by applicable law. ③ This article does not apply to liability arising from our willful misconduct or gross negligence, or to liability that cannot be limited or excluded under applicable law.

11. Changes

We may update these Terms for legal or product changes. Material updates will be announced in the Service or by registered email before they take effect. Continued use after an update means you accept the revised Terms, unless applicable law says otherwise.

12. Governing law

These Terms are governed by the laws of the Republic of Korea. Disputes between you and the Company are subject to the courts with jurisdiction under civil procedure rules. Purchase-contract disputes for Paddle transactions may be handled between you and Paddle under the Paddle Buyer Terms. Contact in-app support or cantilena.spatzen@gmail.com.