Legal

Terms of Service

Effective date: 2026-10-12 / Version: v1 (free beta)

Article 1 (Purpose)

This is an unofficial English translation provided for convenience. The Korean version is the legally binding original and prevails in case of any discrepancy. The purpose of these Terms is to set out the conditions and procedures for using the web service and desktop app Thinket (the "Service") provided by the operator of Thinket (the "Operator"), and the matters concerning the rights, obligations, and responsibilities of the user and the Operator.

Article 2 (Definitions)

  1. "Service" means Thinket’s web service and desktop app, which let a user explore and organize conversations with a large language model (LLM) in a tree structure.
  2. "User" means a person who agrees to these Terms and uses the Service.
  3. "Account" means the eligibility to use the Service that a user registers through Google account sign-in.
  4. "Content" means the questions and notes a user enters into the Service, the files a user attaches, and the answers the Service generates in response to them.
  5. "Beta period" means the period during which the Service is trial-operated before its official launch. The Service is currently provided as a free beta.
  6. “API key” means an API authentication key issued to the user by Anthropic, PBC or OpenAI and registered with the Service.

Article 3 (Posting and Amendment of the Terms)

  1. The Operator posts these Terms on the service screen or a linked screen.
  2. The Operator may amend the Terms to the extent that it does not violate applicable law. When amending them, the Operator specifies the effective date and the reason for the amendment and gives notice within the Service from 7 days before the effective date (or, for changes that are unfavorable to the user or material, from 30 days before and also by email). Changes that tidy wording, correct facts, or are not unfavorable to users may apply from the date of posting.
  3. Where the Operator, in the notice under paragraph 2, has also stated that a user who does not object by the effective date will be deemed to agree, a user who continues to use the Service after the effective date of the amended Terms is deemed to have agreed to the amendment. A user who does not agree may stop using the Service and delete the account under Article 12.

Article 4 (Formation of the Use Contract and Eligibility)

  1. The use contract is formed when the user agrees to these Terms and the Privacy Policy and signs in with a Google account. At the time of sign-in (registration), the Operator obtains, together, consent to these Terms and consent to the collection and use of personal data (including the four notified matters under Article 2 of the Privacy Policy).
  2. Only persons aged 18 or older may register for the Service (a measure required by the age requirements in the terms and policies of the external AI providers Google, Anthropic, and OpenAI). Where a person is confirmed to be under 18, the Operator may refuse registration or delete the account.
  3. During the beta period, signing up is completed immediately by signing in with a Google account, with no separate approval step. The Operator registers each account on the access allowlist (the member roster) for management purposes; roster management and duplicate-account checks are based on the email of the Google account. Accounts whose email has not been verified by Google may be refused.
  4. Where a user has registered by wrongful means, such as misappropriating another person’s account, the Operator may terminate the use contract.
  5. During the beta period, the Operator may limit the number of concurrent users (capacity) for service stability and cost control. A user who registers while capacity is full gets an account immediately, but use of the Service begins in order of registration as capacity becomes available; until then the Service shows the user that they are on the waiting list. While waiting, the user can still manage their profile, export their data, and delete their account.

Article 5 (Content of the Service)

  1. The Service provides the following features.
    • A feature to enter questions to an LLM and receive answers created by generative AI
    • A feature to branch, explore, and organize conversations in a tree structure rather than a linear scroll
    • Other features additionally provided by the Operator
  2. Notice and labeling of AI-generated output: The answers provided by the Service are outputs generated by generative artificial intelligence (AI). Pursuant to Article 31 of the Framework Act on the Development of Artificial Intelligence and the Establishment of a Basis for Trust (the AI Framework Act), the Operator gives advance notice through these Terms that the Service is based on generative AI (Article 31(1)), and gives a standing notice on the service screen so that users can clearly recognize that the answers are generative AI output (Article 31(2)). Where a feature to copy, export, or share answers outside the Service is provided, the Operator also indicates on that output that it was generated by generative AI.
  3. Answers generated by AI may be untrue or inaccurate. Users must not treat an answer as the sole basis for important decisions (medical, legal, financial, and the like) and must verify it themselves where necessary.
  4. To improve the quality and features of the Service and to diagnose quality issues on an account (errors, latency, limits), the Operator may collect and analyze usage statistics (the service-usage statistics under Article 1 of the Privacy Policy and account-linked service-usage records: feature-usage history, usage patterns, and the like), and may use feedback and inquiries submitted by users to improve the Service and to respond. Question and answer text and node titles are not included in these usage statistics. The specific items, legal basis, processing methods, and the way users may request suspension of processing follow Articles 1, 2, 7, and 9 of the Privacy Policy.

Article 6 (Notice on Processing by External AI)

  1. The questions entered by a user and the related conversation context are transmitted to and processed by an external AI service provider in order to generate answers. Signed-in use relies, depending on the model the user selects, on Google LLC’s Gemini API, Anthropic, PBC’s API (Claude models), or OpenAI OpCo, LLC’s API (GPT models) (server location: United States for all), and the demo (trial use without signing in) relies on OpenAI OpCo, LLC’s API (server location: United States). However, if the selected provider is temporarily unable to respond, the question is processed by the default model (Google Gemini API), and the synthesis feature, which weaves several conversations into a document, uses the Google Gemini API.
  2. Under Google’s paid-tier API policy, the content entered by users is not used to train Google’s AI models or to improve its products, and the Operator uses that paid-tier API. Inputs and outputs sent to the Anthropic API and the OpenAI API are likewise not used to train each provider’s models.
  3. The primary storage of user data (account information and the original conversation content) is domestic (the Seoul region), and the details of the outsourcing of personal data processing, overseas transfer, and the Operator’s conversation access policy follow the Privacy Policy.
  4. Where a user registers their own API key and selects a “Anthropic API (your key)” or “OpenAI API (your key)” model, questions, attached files, and the conversation context needed to generate answers are transmitted with the user’s key to that provider (the API of Anthropic, PBC or of OpenAI, servers located in the United States) and processed in the user’s own provider account. In that case the user, as a party to the terms agreed with that provider (such as its terms of use and usage policies), is responsible for complying with them, and processing at the provider follows those terms and the user’s account settings. Details follow Article 4, paragraph 4 of the Privacy Policy. The same applies, with the same responsibility, where the user receives answers in the desktop app through Claude Code or Codex CLI installed on the user’s own device, which are processed in the user’s own provider account. This paragraph applies only to models used with the user’s own API key or tools on the user’s device; Claude and GPT models provided by the Operator are governed by paragraph 1.

Article 7 (Free Beta and Usage Limits)

  1. During the beta period, the Service is provided free of charge.
  2. For stable operation, the Operator may set per-account, daily usage limits (for example, a cap on the number of questions per day), and those limits may change according to operating conditions. The limits and any changes to them are displayed within the Service.
  3. The Operator may introduce paid plans in the future. Upon any move to a paid service, the Operator gives advance notice of its content and conditions and does not charge automatically without the user’s separate consent.
  4. Charges for questions asked with an API key, and for the web searches they involve, are billed to the user’s Anthropic or OpenAI account; the Operator does not bear or pay them on the user’s behalf. The spend shown by the Service is an estimate based on token counts, and the actual amount follows that provider’s billing. The Service’s daily spending limit is an auxiliary feature to help the user and does not limit the provider’s billing, so users are advised to also set a spend limit (budget) in the Anthropic Console or on the OpenAI platform. Registering an API key does not waive the service fees under paragraph 3, which apply separately.

Article 8 (Limitations of the Service During the Beta Period)

  1. Because the Service is in trial operation during the beta period, the Operator gives users advance notice that the following may occur.
    • Temporary or permanent suspension of the Service
    • Loss or reset of data, such as stored conversations
    • Addition, change, or removal of features without notice
  2. Users are advised to separately keep, on their own, important content that needs to be preserved.
  3. Where data loss or a service change is anticipated, the Operator endeavors to give advance notice to a reasonable extent.

Article 9 (Obligations of the User)

  1. A user must not engage in the following acts.
    • Acts that violate applicable law or these Terms
    • Misappropriating another person’s personal data or account, or infringing another person’s rights (such as copyright)
    • Using automated means (bots, scripts, and the like) to circumvent usage limits or to place an abnormal load on the Service
    • Attempting to generate illegal or harmful content by circumventing the safeguards of the Service or the external AI
    • Reverse-engineering or crawling the Service, or obstructing its operation
  2. Where a user violates any of the above items, the Operator may restrict use or delete the account after prior notice (or after-the-fact notice in urgent cases).
  3. A user must register only API keys that the user was issued or is authorized to use, and must manage the registered key themselves. If a key is suspected of having leaked, the user must revoke it immediately in the Anthropic Console or on the OpenAI platform and also delete it from the Service. The Operator takes measures to store registered keys securely (Article 8 of the Privacy Policy).
  4. Requests to suspend, and requests to resume, the reproduction and transmission of content that infringes the copyright or other rights of others are received by the recipient designated by the Operator under Article 103(4) of the Korean Copyright Act. The recipient is the Thinket Operator, reachable at support@thinket.ai (with "[Copyright report]" in the subject line). The Operator suspends or resumes the reproduction and transmission of content in accordance with the procedures set by that Act and its Enforcement Decree, and may terminate the use of accounts that repeatedly infringe the rights of others.

Article 10 (Rights in Content)

  1. The rights in the content entered by a user belong to that user. You represent and warrant that you have the rights and permissions needed to provide the content you enter or attach, and you are responsible for ensuring that it does not violate applicable law or these Terms.
  2. The user grants the Operator the right to use the content to the extent necessary to provide the Service (storage, display, transmission to the external AI, backup, and the like). This right is limited to the purpose of providing the Service.
  3. The rights to use AI-generated answers belong to the user to the extent permitted by applicable law and the external AI provider’s policy. However, the legal status of generative AI output may vary depending on statutes and case law.
  4. The rights in the Service’s software, design, trademarks (including the name Thinket), and the like belong to the Operator.

Article 11 (Change and Suspension of the Service)

  1. The Operator may change or suspend all or part of the Service as required for operational or technical reasons.
  2. Where the Service is discontinued, the Operator gives notice within the Service at least 30 days in advance and endeavors to provide a reasonable means for users to download or move their content.

Article 12 (Termination of the Contract and Account Deletion)

  1. A user may terminate the use contract (delete the account) at any time. Terminate it yourself using “Delete account” in the account menu within the Service, or send a request to the contact point (email) in Article 16 and the Operator will handle it without delay. Deleting an account also removes it from the access allowlist (member roster); to use the Service again you must sign up anew with a Google account, and previous data is not restored.
  2. When an account is deleted, the user’s data, such as stored conversation content, is deleted in accordance with the procedure set out in the Privacy Policy.

Article 13 (Disclaimer of Warranties)

  1. During the beta period, the Service is provided "as-is". The Operator does not warrant the completeness, accuracy, fitness for a particular purpose, or uninterrupted operation of the Service.
  2. The Operator does not warrant the accuracy, legality, or usefulness of AI-generated answers.

Article 14 (Limitation of Liability)

  1. Except where there is intent or gross negligence on the Operator’s part, the Operator is not liable for damage incurred by a user due to the following.
    • Suspension, change, or discontinuation of the free beta service, or loss of data
    • Errors in AI-generated answers and judgments a user makes in reliance on them
    • Grounds attributable to the user, or force majeure such as a natural disaster
    • Charges incurred with Anthropic or OpenAI through the user’s use of an API key, damage caused by the user’s negligent management of the key (including leakage), and outages or policy changes of Anthropic’s or OpenAI’s services
  2. Even where the Operator is liable, the scope of compensation is limited to the minimum extent permitted by applicable law, taking into account the nature of a service provided free of charge.
  3. This provision is not construed as excluding mandatory statutory provisions to the disadvantage of the consumer.

Article 15 (Governing Law and Jurisdiction)

  1. The law of the Republic of Korea applies to disputes concerning these Terms and use of the Service.
  2. Where a dispute arises and litigation is filed, the competent court is determined in accordance with the Civil Procedure Act.

Article 16 (Contact)

For inquiries about the Service and these Terms, please contact us below.

Addendum

These Terms take effect on 2026-10-12. (Revised 2026-10-12: the separate copyright infringement notice page was removed, and the reporting sentence in Article 9 paragraph 2 was moved to Article 9 paragraph 4, which now designates the recipient under Article 103(4) of the Korean Copyright Act and sets out the procedure. As there is no change unfavorable to users, this revision takes effect on the date of posting. The previous edition took effect on 2026-10-05. Second revision of 2026-10-05: the operator entry in Article 16 was corrected to two co-operators and the contact email changed to support@thinket.ai; as a correction of facts, it takes effect on the date of posting. First revision of 2026-10-05: the desktop app was included in the Service in Article 1 and Article 2 item 1; Article 3 paragraphs 2 and 3 now set out how changes are announced and the conditions for deemed consent; Anthropic and OpenAI were added to the basis of the age requirement in Article 4 paragraph 2; Article 6 paragraphs 1 and 4 now cover processing when the selected provider cannot respond, the synthesis feature, and Claude Code and Codex CLI in the desktop app; and the term in Article 5 paragraph 4 was aligned with the Privacy Policy. The previous edition took effect on 2026-10-02. As there is no change unfavorable to users, this revision takes effect on the date of posting, and users are notified by email. Revised 2026-10-02: as signed-in users can now select Claude models (Anthropic) and GPT models (OpenAI) provided by the Operator, Article 6 paragraphs 1, 2, and 4 were supplemented and OpenAI’s entity name was corrected to OpenAI OpCo, LLC. The previous edition took effect on 2026-09-27. This revision takes effect on the date of posting. Revised 2026-09-27: for the feature of receiving answers with the user’s own Anthropic or OpenAI API key, Article 2 item 6 (definition of API key), Article 6 paragraph 4 (external AI used with the user’s own API key), Article 7 paragraph 4 (charges for API key use), and Article 9 paragraph 3 (key management obligations) were added, and Article 14 paragraph 1 was supplemented. The previous edition took effect on 2026-09-11. This revision takes effect on the date of posting, and users at the time are notified individually.)