Skip to content
日本語EN

Privacy Policy

1. The short version

This box summarizes the Privacy Policy in plain language. The full policy below controls if there is any difference.

  • We do not sell Personal Data, and we do not use it for targeted advertising or cross-context behavioral advertising.
  • We collect only what we need to run KenteiPro, such as account details, support messages, payment status, and usage and security information, depending on the features you use. Payment providers handle card details, and we do not store full card numbers.
  • We do not use your content or Personal Data to train models, or let a provider train on it, without your separate, explicit opt-in.
  • On request, we will give you your data, correct it, export it, and delete it, subject to the limited records we must keep.
  • Your data may be processed in the United States and other countries where our providers operate. We take appropriate safeguards where law requires them and will tell you which on request.
  • You must be at least 21. We do not offer, market, or target KenteiPro in the European Union, the European Economic Area, the United Kingdom, or Switzerland.
  • We will give advance notice of material changes to this policy.

2. Operator and scope

KenteiPro is a product operated by Algodyne Corporation, a Delaware corporation. In this Privacy Policy, KenteiPro refers to the product and Services, and Algodyne, we, us, or our refers to Algodyne Corporation.

This Privacy Policy explains how Algodyne collects, uses, shares, protects, and retains Personal Data when people use KenteiPro websites, applications, accounts, support channels, and related services.

This policy does not apply to third-party websites or services that Algodyne does not control, including payment providers, sign-in providers, and integrations. Those services have their own privacy notices.

3. Regions we do not serve

Algodyne does not offer, market, or target the Services in the European Union, the European Economic Area, the United Kingdom, or Switzerland, and has not appointed a representative in any of them.

Algodyne does not block sign-ups. If you register for or use the Services from the European Union, the European Economic Area, the United Kingdom, or Switzerland, you do so on your own initiative and you are responsible for complying with the local law that applies to you. You acknowledge that Algodyne does not offer or target the Services in those regions, and you give the acknowledgment set out in the Terms before you register.

4. Personal Data we collect

Algodyne may collect the following Personal Data, depending on the features you use.

Account and identity information

  • Email address, name or display name, and authentication identifiers.
  • Login, session, passkey, multi-factor authentication, recovery, and security metadata where enabled.
  • Account, language, notification, consent, and privacy settings.

Support and communications

When a user contacts Algodyne about KenteiPro, Algodyne may collect contact information, messages, attachments, screenshots, logs supplied by the user, support history, and resolution notes.

Users should not send unnecessary content, credentials, recovery material, payment-card numbers, or other sensitive information through support channels.

Payment and commercial information

Where paid services are enabled, Algodyne may collect plan, entitlement, invoice, tax, payment-status, refund, dispute, and billing-event information, and customer and transaction identifiers issued by the payment provider. Payment providers process payment-card and banking details. Algodyne does not store full payment-card numbers.

Usage, technical, and security information

Algodyne and its service providers may process:

  • IP address, browser type and version, operating system, device information, approximate region, referring URLs, request headers, and timestamps.
  • Pages visited, feature usage, performance data, errors, and billing events.
  • Login, session, authentication, audit, abuse, spam, fraud, rate-limit, and security signals.

5. Study data

When you study, we record lesson progress, flashcard review history and scheduling state, mock-examination answers and scores, and glossary use needed to run the service and show your progress. We do not collect government identifiers.

6. Cookies and similar technologies

KenteiPro uses cookies, local storage, session storage, and similar technologies for authentication, security, requested preferences, consent records, and service operation. Optional analytics and other non-essential technologies are used only with consent where required.

7. How Algodyne uses Personal Data

Algodyne may use Personal Data to:

  • Provide, operate, maintain, secure, and support KenteiPro.
  • Create and manage accounts, sessions, and permissions.
  • Process subscriptions, payments, invoices, taxes, refunds, disputes, credits, usage, and entitlements where paid features are enabled.
  • Send transactional, security, billing, support, legal, and user-requested communications.
  • Detect and prevent abuse, spam, fraud, infringement, attacks, and policy violations.
  • Maintain security and audit evidence for sensitive actions.
  • Improve reliability, accessibility, usability, performance, and product quality using aggregated usage information and, where required, consented analytics.
  • Comply with legal obligations and enforce Algodyne policies and contracts.

Algodyne does not sell Personal Data and does not use Personal Data for targeted advertising or cross-context behavioral advertising.

8. Legal bases

Where applicable law requires a legal basis or a stated ground for processing, Algodyne relies on the following:

| Purpose | Legal basis where applicable |

|---|---|

| Accounts, paid access, and core service features | Contract |

| Storing and processing content or data at the user's request | Contract |

| Features and actions requested by the user, such as imports, exports, sharing, or AI assistance | Contract and consent where required |

| Security, abuse prevention, fraud prevention, rate limiting, and service integrity | Legitimate interests and legal obligation where applicable |

| Transactional and service communications | Contract or legitimate interests |

| Optional marketing communications | Consent |

| Optional analytics and non-essential device technologies | Consent where required |

| Billing, tax, accounting, disputes, and legal compliance | Contract and legal obligation; otherwise Algodyne's legitimate interest in meeting applicable tax and accounting obligations |

Where processing is based on consent, you may withdraw consent at any time. Withdrawal does not affect processing that occurred before withdrawal.

9. Sharing and subprocessors

Algodyne may share Personal Data with:

  • Cloud infrastructure, hosting, storage, security, content-delivery, observability, authentication, email, and support providers.
  • Payment and billing providers where paid features are used.
  • Integration, export, calendar, map, or other third-party providers when requested by the user or needed for a feature the user uses.
  • Professional advisers, auditors, insurers, accountants, and legal counsel.
  • Courts, regulators, law-enforcement bodies, or other parties where required by law or necessary to protect rights, security, or safety.
  • A successor or transaction participant in a merger, acquisition, financing, reorganization, or sale of assets, subject to appropriate safeguards.

Algodyne uses third-party providers to operate KenteiPro under contracts, data-protection terms, and security reviews where appropriate, and maintains information on the providers actually enabled for production processing and what each processes. Each provider processes Personal Data only to the extent needed for its stated purpose and also under its own privacy policy.

If you follow a link to a third-party site or service, that service receives the information your browser sends to it and handles that information under its own terms and privacy policy.

10. Who processes data for us

  • Cloudflare, Inc. (United States and its global network): hosting, database (D1), and transactional email delivery for KenteiPro. Receives account email addresses, study progress, and email message content needed to deliver sign-in codes and links.
  • Stripe, Inc. and Stripe Japan (United States and Japan): payment processing for paid passes. Receives the email address and payment details you enter at Stripe checkout; we never see or store full card numbers.

We do not sell personal data and we do not share account data with examination bodies or employers.

11. International processing

Algodyne Corporation is a United States corporation. Personal Data is processed in the United States and in other countries where Algodyne, its infrastructure providers, or its subprocessors operate. Some of that processing is necessary to provide the Services you ask for, such as hosting, payment processing, and email delivery, and by using the Services you understand that your Personal Data will be transferred to and processed in those countries.

Algodyne takes appropriate safeguards where applicable law requires them for a transfer, such as contract terms with providers, and will ask for your consent where the law requires it. For users in Japan, where the Act on the Protection of Personal Information requires your consent or other measures before Personal Data is provided to a third party in a foreign country, Algodyne will obtain that consent or take those measures. On request, Algodyne will provide details of the safeguards that apply to a particular transfer. Algodyne does not state that any specific transfer mechanism applies to its processing unless the corresponding contractual and operational evidence exists.

12. International processing

Your data is processed by Cloudflare (United States and its global edge network) and, when you buy a paid pass, by Stripe (United States and Japan). Support and privacy mailboxes (support@kenteipro.com, privacy@kenteipro.com) are received through Cloudflare email routing. By registering you consent to this cross-border processing as described in the Privacy Policy's Japan rights clause.

13. Retention

Algodyne retains Personal Data only for as long as reasonably necessary for the purposes collected, including service operation, user instructions, security, abuse prevention, billing, tax, accounting, disputes, backups, audit integrity, and legal compliance.

| Data type | Retention approach |

|---|---|

| Account information | Retained while the account is active and for a limited period afterward where legally or operationally necessary |

| Support records | Retained while needed to provide support and to resolve legal, security, or quality matters |

| Security and audit records | Retained for service integrity, abuse prevention, incident investigation, and legal compliance |

| Billing and tax records | Retained as required for accounting, tax, fraud-prevention, chargeback, and legal obligations where paid features are enabled |

Deleting an account or a request record may not immediately remove information from backups, security logs, legal records, billing records, already-delivered exports or emails, caches, or third-party archives.

14. How long we keep data

  • Account and profile data: while your account exists, and deleted within 30 days after you delete your account, except records we must keep for tax and accounting (billing records, 7 years).
  • Study progress, flashcard history, and mock-examination attempts: while your account exists; removed with account deletion.
  • Sign-in challenges (one-time codes, magic links, passkey challenges): minutes only; they expire and are deleted on use or expiry.
  • Email delivery records: 90 days for delivery debugging, then deleted.

15. Security

Algodyne uses technical and organizational controls intended to protect Personal Data, including encrypted transport, access controls, least-privilege production access, authentication controls, environment separation, monitoring, and data minimization.

No service can guarantee absolute security. Users are responsible for protecting credentials, devices, browsers, sessions, recovery material, and email accounts.

16. Rights and choices

On request, Algodyne will:

  • Give you access to your Personal Data.
  • Correct inaccurate Personal Data.
  • Delete your Personal Data.
  • Export your Personal Data to you.
  • Stop optional marketing communications to you.
  • Honor your withdrawal of consent.

To the extent Algodyne agrees or the law that applies to you requires, you may also:

  • Object to or restrict certain processing.
  • Opt out of certain sale, sharing, targeted advertising, or profiling.
  • Appeal certain privacy-request decisions.

Privacy requests can be sent to privacy@kenteipro.com (support@kenteipro.com as a fallback). Algodyne will respond within a reasonable time and in any case within the time the applicable law requires. Algodyne may verify identity before completing a request. Some information may be retained where necessary for security, legal, billing, tax, fraud-prevention, audit-integrity, backup, or dispute purposes.

17. Japan (APPI)

For users in Japan, Algodyne handles personal information in line with the Act on the Protection of Personal Information (APPI), including purpose specification, use within stated purposes, appropriate security controls, and procedures for requests concerning retained personal data.

Because the Act requires your consent before Personal Data is provided to a third party in a foreign country, a user in Japan who ticks the checkbox described in the Terms to agree to this Privacy Policy consents to their Personal Data being provided, so that KenteiPro can be provided to them, to the third-party service providers in the United States and in other countries where they operate that are described in "International processing".

18. California privacy notice (CCPA/CPRA)

If California privacy laws apply to a user or to Algodyne, California users may have rights to know, access, correct, delete, and port Personal Data, and to opt out of certain sale, sharing, targeted advertising, or sensitive-information uses.

KenteiPro's current posture is that it does not sell Personal Data and does not use Personal Data for cross-context behavioral advertising. Where legally required, Algodyne will honor applicable opt-out preference signals such as Global Privacy Control for browser-based sale, sharing, or targeted-advertising choices.

19. Children

KenteiPro is intended only for people who are at least 21 years old.

Algodyne does not knowingly collect Personal Data from anyone under 21, and KenteiPro does not offer a parental or guardian-consent path. If Algodyne learns that a person under 21 supplied Personal Data or created an account, Algodyne will disable the relevant access and delete the information unless continued retention is legally required.

20. Changes to this policy

Algodyne may update this Privacy Policy as KenteiPro, providers, laws, or data practices change. The current policy will be posted on the KenteiPro legal page with its effective and last-updated dates.

Algodyne will not make surprise changes. For a material change, including one that expands how Personal Data is used or shared, Algodyne will give you at least 30 days' notice by email or by a prominent notice in the product before it takes effect, except where the law requires a change sooner. A new use that needs your consent will wait for that consent.

21. Language

Translations of this Privacy Policy, including the Japanese version, are provided for convenience. If there is any difference or conflict between a translation and the English version, the English version controls, except that where you are a consumer and the Japanese version you were shown is more favorable to you, the Japanese version applies to you.

22. Contact

  • Privacy requests, legal notices, and policy questions: privacy@kenteipro.com (support@kenteipro.com as a fallback)
  • Operator and controller: Algodyne Corporation, Delaware, United States. Algodyne's address and the name of its representative are provided without delay on request to privacy@kenteipro.com.