Support and privacy information for Caiyun Handwriter on iPhone and iPad.
Effective date: September 16, 2026
This policy describes Caiyun Handwriter for iPhone and iPad, provided by Ling Shen, and this support website.
The app stores your handwritten notes and settings locally on your device. It does not require an app account. We do not operate a server that receives your notes, and this version does not include app-provided cloud synchronization.
The app does not include third-party advertising or analytics services, does not track you across other companies’ apps or websites, and does not sell your personal information.
The optional Unlimited Notes unlock is processed by Apple through the App Store. The app uses Apple’s StoreKit framework to read and verify purchase information, such as the purchased product and its transaction or revocation status, to grant or restore access. This information is not sent to a developer-operated server. We do not receive your payment-card details. Apple processes purchase and account information under Apple’s Privacy Policy.
When you choose to share a note, its exported image is passed to the app, service, or destination you select through the system share sheet. That destination’s privacy practices apply. Saving an image to Photos may require permission; you can manage permissions in device Settings. We do not receive a copy merely because you export a note.
Depending on your device settings, Apple device backups may include app data. Apple may also process diagnostic information according to your device’s analytics-sharing choices. These services are controlled by Apple and your settings; they are not a separate backup or analytics service operated by us.
If you email support, we receive the email address, message, and any attachments you choose to send. We use them to respond and troubleshoot. Email providers process these messages as needed to deliver and store email. Do not send private notes, passwords, or payment details unless the information is genuinely needed for your request; passwords and payment-card details are never required.
Support correspondence is kept only as long as needed to handle the request and any legitimate recordkeeping obligations. You may request deletion by emailing the contact below, subject to any legal retention requirements.
These support pages do not use our own tracking scripts or advertising cookies. When hosted on GitHub Pages, GitHub may log visitors’ IP addresses for security purposes. See the GitHub Privacy Statement.
You can delete notes in the app. Deleting the app removes its local app data from that device; offloading is different and may retain data. Exported images, messages sent to others, and device backups must be managed separately in their respective apps or services. We cannot retrieve notes from your device or restore notes through Restore Purchases.
There is no app account to delete. You can stop using the app at any time and contact us about information you have sent to support. Apple manages its own transaction records and related privacy requests.
We will update this page and its effective date if these practices change.
For privacy questions or requests, contact Ling Shen at forrest.lingshen@gmail.com.