Privacy Policy
This policy explains what information HachiCalendar ("the App", "we", "us") collects, why, who it is shared with, and the choices you have. It applies to the App and to this website.
1. Summary
- You can use the App without an account. Your events then stay on your device.
- If you sign in with a Hachi account, we store your events and memos on our servers so they sync across your devices.
- When you use Hachi AI, what you send it is processed by third-party AI model providers.
- We do not show ads, do not use third-party analytics or tracking tools, and do not sell your information.
2. Information we collect
2.1 Account information
When you create a Hachi account, we collect your email address and password. We use your email address to sign you in, verify your account, and reply to you when you contact us.
2.2 Content you create
If you are signed in, we store the content you create in the App on our servers, including events, memos, calendars, reminders, and sharing settings, so it can sync across your devices. If you are not signed in, this content is stored only on your device.
2.3 Hachi AI
When you use Hachi AI, we collect what you type or say to it. For features that analyze or summarize your time, we also use the event information needed for that request.
2.4 Calendars already on your device
If you allow access to your device calendars (for example iCloud, Google or Exchange calendars added in iOS Settings), the App reads them on your device so it can show them. Those calendars continue to be synced by their own providers.
2.5 Technical information
When the App connects to our servers, we receive technical information such as your IP address, device type, operating system and app version, and the time of the request. We use it to run the service, keep it secure, and fix problems.
3. How we use information
- To provide the App: sync, calendar sharing, reminders, and Hachi AI
- To manage your account and respond to your requests
- To keep the service secure and prevent abuse
- To comply with legal obligations
We do not use your information for advertising, and we do not sell it.
4. Who we share information with
- People you share calendars with. When you share a calendar, the people you invite can see it, and edit it if you allow them to.
- AI model providers. When you use Hachi AI, your request and the information needed to fulfil it are sent to third-party large language model providers to generate the response. If you do not want this, do not use Hachi AI.
- Service providers. We use hosting and infrastructure providers to store and transmit data on our behalf.
- When required by law. We may disclose information if required by law or to protect the rights and safety of our users or others.
5. Storage, transfer and security
Your information may be stored and processed in countries other than the one you live in, including by the AI model providers described above. We encrypt data in transit and limit access to it, but no method of storage or transmission is completely secure.
6. How long we keep information
We keep your account information and synced content for as long as your account exists. When you delete your account, we delete this information within a reasonable period, unless we are required by law to keep it longer.
7. Your choices and rights
- You can use the App without signing in, in which case your content is not uploaded.
- You can edit or delete your events and memos in the App at any time.
- You can delete your account in the App or by emailing us. Deleting it removes your synced content from our servers.
- You can withdraw calendar access in iOS Settings.
- Depending on where you live, you may have the right to access, correct, delete or receive a copy of your information. Email us to make a request.
8. Children
The App is not directed to children under 13, and we do not knowingly collect personal information from them. If you believe a child has given us information, contact us and we will delete it.
9. Changes to this policy
We may update this policy. When we do, we will post the new version on this page and update the date above. For significant changes, we will also notify you in the App.
10. Contact
Questions or requests about your privacy: hachi.iphone@gmail.com