Terms of Service

Effective date: August 20, 2026
Last updated: September 7, 2026

These Terms of Service ("Terms") govern your use of the Kurozu mobile application for iOS (the "App") operated by Kurozu ("we," "us," or "our").

By downloading, installing, or using the App — including by continuing locally, creating a cloud account, or tapping a sign-in button that references these Terms — you agree to these Terms and our Privacy Policy. If you do not agree, do not use the App.

Contact: support@kurozu.app

1. The service

Kurozu is a local-first personal timeline application. You can record events, observations, and context as facts arranged in time, optionally organized into timelines.

The App is designed to help you build portable personal context — including health-related context you choose to record — for your own use and, if you wish, to copy or export elsewhere.

The App may provide:

• Ask AI, which generates an answer and may use web search;
• Suggest, which proposes facts or follow-up questions and may use web search; and
• AI Add Facts, which extracts proposed facts from text you provide for your review.

The App is not a medical device, clinical decision-support tool, emergency service, or substitute for professional medical, legal, financial, or other advice.

2. Eligibility

You must be at least 13 years old (or the minimum age required in your jurisdiction) to use the App. If you are under the age of majority where you live, you may use the App only with permission of a parent or guardian who accepts these Terms on your behalf.

3. Local-only and cloud modes

3.1 Local-only (no account)

You may use core timeline features without signing in. In this mode:

• Timelines and facts are stored on your device only.
• We do not receive your timeline content.
• Cloud sync is not available.
• Data may be lost if you delete the App or lose your device unless you back up your device through other means.

3.2 Cloud account (opt-in)

If you sign in, you may create cloud-synced timelines stored on our servers, tied to your authentication identity (via Supabase).

• Cloud timelines require an internet connection to create or edit.
• When offline while signed in, cloud timelines may be shown read-only from a local cache.
• Sign-out removes cloud data from your device cache but does not delete server data.
• Move to cloud copies a local timeline to the cloud; the local original remains on your device.

Local-only and cloud timelines are separate. Signing in does not automatically upload your existing local timelines.

4. Accounts

Cloud accounts use Google Sign-In or Sign in with Apple. You must provide accurate information, keep access to your account secure, and notify us of unauthorized use. Apple private-relay and Google email addresses may create separate Kurozu accounts.

We may suspend accounts that violate these Terms or create legal, security, fraud, or service-integrity risk.

5. AI and web-search features

AI features require your affirmative permission, a signed-in account, a cloud timeline, network access, an eligible Premium entitlement, and available AI allowance. You may decline AI permission and continue using non-AI features.

At your request, Kurozu may send prompts, selected timeline context, and bounded assistant history to OpenAI or Google Cloud Vertex AI. When Ask or Suggest uses web search, Perplexity receives a derived query and search filters rather than the raw timeline. See the Privacy Policy for the data sent to each provider.

AI routing may depend on the feature, model availability, reliability, and operational requirements. We will request permission again before materially expanding the data sent or adding another AI provider.

AI output may be inaccurate, incomplete, outdated, offensive, or unsuitable for your circumstances. It may resemble output provided to others or third-party material. You must review generated answers, proposed facts, dates, tags, and citations before relying on or saving them.

Citations and links do not guarantee that a source supports every generated claim. Open the source and verify important information independently.

Where available and separately permitted, Ask may use Tavily or Firecrawl to extract text from public webpages. This does not provide access to authenticated, private or paywalled content and does not grant permission to copy a publisher's work. Extracted text may omit figures, tables or other material; an extraction status is not verification of accuracy or completeness. Do not submit private or signed links or use this feature to bypass access controls. Page reading and the additional AI processing use your AI allowance. A request may start with the ordinary initial allowance hold and later stop if its processing exhausts the remaining allowance.

6. Free and Premium plans

The Free plan permits up to one cloud timeline. A current Premium subscription permits up to 50 cloud timelines and access to eligible AI features, subject to AI allowance and other requirements in these Terms. Local-only timelines are separate from these cloud limits.

We may change plan features or limits for future subscription periods after notice. We will not materially reduce the paid service promised for a subscription period already purchased, except where required for security, law, third-party availability, or circumstances outside our reasonable control.

6.1 AI allowance

Premium includes a recurring AI allowance. The current allowance and remaining percentage are shown in the App rather than fixed in these Terms.

• Usage varies by feature, context size, model work, and web-search activity.
• Allowance resets with the applicable billing cycle and does not roll over unless the App expressly states otherwise.
• AI features pause when no applicable allowance remains.
• Allowance and promotional or bonus amounts are licenses to use App features. They are not money, property, stored value, transferable, or redeemable for cash.
• Any bonus amount and expiry are shown in the App when granted.

No free trial or introductory subscription offer is included unless Apple and the App expressly show one before purchase.

7. Apple subscriptions and billing

Premium is offered as a monthly auto-renewing subscription through Apple's In-App Purchase system.

• The App displays the subscription title, monthly duration, localized price, and included benefits before purchase.
• Payment is charged to your Apple ID after you confirm the purchase.
• The subscription renews automatically unless cancelled through your Apple account's subscription settings, subject to Apple's applicable timing and billing terms.
• Apple controls payment processing, taxes charged through the App Store, renewal, billing grace periods, and refunds.
• Refund requests must be submitted to Apple. If Apple records a refund, cancellation, reversal, or chargeback, we may revoke the corresponding entitlement and unused AI allowance.

7.1 Original Kurozu account

Premium is associated with the Kurozu account used for purchase. To recover access after reinstalling or changing devices, sign in to the same Kurozu account. Purchases and entitlements may not be transferable between Kurozu accounts. Contact support@kurozu.app if you cannot access the original account.

Entitlement recovery through Kurozu requires access to that original account. This does not limit any restoration right Apple provides under its own terms.

7.2 Cancellation and account deletion

Cancelling Premium stops future renewal but does not delete your Kurozu account. Deleting your Kurozu account does not cancel Premium or stop Apple billing.

Before account deletion, the App warns you and provides access to Apple's subscription-management page. You may continue after acknowledging the warning. Because entitlement recovery is tied to the original Kurozu account, deleting that account may prevent use of the remaining subscription period even if Apple continues billing until cancellation.

8. Apple Health

The App may include a preview feature that reads Apple Health data on your device after you grant permission.

• Processing is on-device; Apple Health samples are not automatically uploaded to Kurozu or sent to an AI provider.
• The feature is experimental, may change or be removed, and is not a medical device.
• You control Apple Health permissions in iOS Settings.
• Health information you manually enter into a cloud timeline or AI prompt may be processed as user content.

9. Export

Export generates plain text on your device and copies it to your clipboard. You choose where to paste it. We are not responsible for third-party apps, websites, AI services, or how they handle exported content.

If you include selected Apple Health summaries, the App shows an inline warning before copying. Only share sensitive information with services or people you trust.

10. Acceptable use

You agree not to:

• Use the App unlawfully or violate another person's rights
• Interfere with, probe, reverse engineer, overload, or abuse the service except where applicable law permits
• Submit content you do not have the right to use
• Circumvent plan, entitlement, allowance, security, or access controls
• Use the App or AI output to provide emergency services, diagnose or treat a condition, or impersonate licensed professional advice
• Represent AI-generated material as verified professional advice
• Use AI or search features in violation of an applicable provider acceptable-use policy

We may remove content, restrict features, or suspend access for violations.

11. Your content and AI output

You retain ownership of content you create. You grant Kurozu a worldwide, non-exclusive, limited license to host, copy, transmit, transform, and process cloud-synced content and AI inputs solely to operate, secure, and provide the features you request, including processing by the providers identified in the Privacy Policy. This license ends when the content is deleted, except for temporary backups, completed processing, and records retained as described in the Privacy Policy.

You represent that you have the rights and permissions needed for content you submit and that it does not violate law, these Terms, or another person's rights.

As between you and Kurozu, and to the extent permitted by law, you may use AI output produced for you. AI output may not be unique, may contain third-party material, and may not qualify for intellectual-property protection. These Terms do not transfer rights owned by publishers, source websites, AI providers, or other third parties.

12. Kurozu and third-party intellectual property

The App, its design, branding, and underlying software are owned by us or our licensors. These Terms do not grant you rights to our trademarks or code except the limited license to use the App as intended.

Search-source titles, publisher names, domains, dates, links, and linked pages belong to or are controlled by their respective owners. Source metadata and citations are provided to help you locate information. They do not imply endorsement, affiliation, or permission to reproduce the linked work.

13. Third-party services

The App uses third-party services including Supabase, Google, Apple, Firebase, OpenAI, Perplexity, RevenueCat, and cloud infrastructure providers. Your use of those services may be subject to their terms and policies. We are not responsible for third-party services outside our reasonable control.

Provider availability, models, search indexes, linked pages, and applicable third-party terms may change. We may replace or discontinue a provider where reasonably necessary, subject to any notice or renewed consent required by law or the Privacy Policy.

14. Disclaimers

THE APP AND ALL CONTENT ARE PROVIDED "AS IS" AND "AS AVAILABLE" WITHOUT WARRANTIES OF ANY KIND, WHETHER EXPRESS OR IMPLIED, INCLUDING MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT.

WE DO NOT WARRANT THAT THE APP WILL BE UNINTERRUPTED, ERROR-FREE, OR SECURE, OR THAT AI OUTPUT, PROPOSED FACTS, SEARCH RESULTS, CITATIONS, SOURCE METADATA, OR EXPORTED CONTENT WILL BE ACCURATE, COMPLETE, CURRENT, UNIQUE, OR NON-INFRINGING.

HEALTH AND PROFESSIONAL-ADVICE DISCLAIMER: THE APP IS FOR PERSONAL INFORMATION MANAGEMENT ONLY. IT DOES NOT PROVIDE MEDICAL, LEGAL, FINANCIAL, OR OTHER PROFESSIONAL ADVICE. DO NOT USE IT FOR AN EMERGENCY. ALWAYS SEEK ADVICE FROM AN APPROPRIATELY QUALIFIED PROFESSIONAL AND INDEPENDENTLY VERIFY INFORMATION BEFORE MAKING A CONSEQUENTIAL DECISION. NEVER DISREGARD PROFESSIONAL MEDICAL ADVICE BECAUSE OF SOMETHING IN THE APP.

15. Limitation of liability

TO THE MAXIMUM EXTENT PERMITTED BY LAW, WE AND OUR AFFILIATES, OFFICERS, EMPLOYEES, AND SUPPLIERS WILL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES, OR ANY LOSS OF DATA, PROFITS, OR GOODWILL, ARISING FROM YOUR USE OF THE APP.

OUR TOTAL LIABILITY FOR CLAIMS RELATING TO THE APP OR THESE TERMS WILL NOT EXCEED THE GREATER OF US $100 OR THE AMOUNT YOU PAID FOR PREMIUM DURING THE 12 MONTHS BEFORE THE EVENT GIVING RISE TO THE CLAIM.

SOME JURISDICTIONS DO NOT ALLOW CERTAIN LIMITATIONS; IN THOSE CASES, OUR LIABILITY IS LIMITED TO THE FULLEST EXTENT PERMITTED BY LAW.

Nothing in these Terms limits liability that cannot be limited under applicable law, including liability for willful misconduct or gross negligence where such limitation is prohibited.

16. Indemnification

You agree to indemnify and hold us harmless from claims, damages, and expenses (including reasonable legal fees) arising from your content, your use of the App, or your violation of these Terms, except to the extent caused by our gross negligence or willful misconduct.

17. Suspension, termination, and account deletion

You may stop using the App at any time. You may delete your cloud account in Settings as described in the Privacy Policy. Account deletion removes cloud timelines, facts, active entitlements, authentication data, and other active service data, while limited anonymized account, billing, usage, fraud, tax, accounting, and security records may remain.

Account deletion does not cancel an Apple subscription. Review Section 7.2 before deleting an account.

We may suspend or terminate access if you breach these Terms, create security or legal risk, reverse or charge back a purchase, exhaust applicable entitlement, or if we discontinue the App. Where practicable, we will provide notice of a service discontinuation affecting an active paid subscription.

Sections that by their nature should survive (including disclaimers, limitation of liability, and indemnification) survive termination.

Uninstalling the App does not delete cloud data unless you delete your account first.

18. Changes

We may modify the App or these Terms. We will post updated Terms at this URL and update the effective date. Material changes may be communicated in the App or by email. Where required, we will ask you to accept material changes before they apply. Changes to a future subscription period do not retroactively reduce the paid service promised for a period already purchased, subject to Section 6.

19. Governing law and disputes

These Terms are governed by the laws of Japan, without regard to conflict-of-law rules. If you are a consumer, nothing in these Terms limits any mandatory rights or protections you may have under the laws of the country or region where you live.

Except where applicable law gives you the right to bring a claim elsewhere, you and we agree that disputes arising out of or relating to these Terms or the App will be resolved in the courts of Japan, with the Tokyo District Court as the exclusive court of first instance.

Before filing a claim, you agree to contact us at support@kurozu.app so we can try to resolve the issue informally.

20. General

• Entire agreement: These Terms, the Privacy Policy, and Apple's Standard EULA are the entire agreement regarding the App and related service.
• Severability: If a provision is unenforceable, the remainder stays in effect.
• No waiver: Failure to enforce a provision is not a waiver.
• Assignment: You may not assign these Terms without our consent. We may assign them in connection with a merger or sale.

21. Apple Standard EULA

The App is licensed, not sold. Apple's Standard Licensed Application End User License Agreement applies to the license for the iOS App. These Terms supplement that license and govern Kurozu accounts, cloud services, AI features, Premium benefits, and other service matters.

If these Terms conflict with Apple's Standard EULA regarding the App license, Apple's Standard EULA controls to the extent of that conflict. Apple is not responsible for Kurozu's cloud service, support, subscriptions, or content except as stated in Apple's own terms.

22. Contact

Kurozu
Email: support@kurozu.app