1. At a glance
The Service has no sign-up or login and does not directly ask you to enter personal information such as your name or contact details. The following information may be processed while the Service is provided and ads are shown.
| Category | Information processed | Purpose | Retention |
|---|---|---|---|
| Member information | Not processed (no sign-up or login) | — | — |
| Share link board data | Boards you save with [Share] (parts, wiring, net names, and so on) | Showing the same board to whoever opens the link | Deleted automatically 180 days after the last save |
| Access information (automatic) | IP address, requested address, browser and operating system information, access time | Providing the Service, security, incident response | Follows the policy of the hosting provider (Cloudflare) |
| Inquiries | The address and message you send by email | Replying to the inquiry | Destroyed without delay once handled (up to 1 year if needed for disputes) |
| Browser-stored information | Editor settings (local and session storage) | Keeping your settings | Stored only on your device; you can delete it |
| Ad-related information (automatic) | Cookies, ad identifiers, IP address, pages visited, and so on | Serving ads, measuring performance, preventing invalid clicks | Until the cookie expires (follows Google's policy) |
2. Share link data
When you press the editor's [Share] button, the current board's data is compressed and stored
on the server (Cloudflare KV), and a random 10-character address (/s/…) is
created. This data contains only circuit information such as part types and positions, wiring,
labels, and net aliases, and no information that identifies you. However, if you write
personal information such as a name or contact details in a part label or net alias, that is
stored with it, so please do not.
- Anyone who knows the link address can open the board.
- Shared pages are set not to appear in search engines.
- It is deleted automatically 180 days after the day it was last saved. Saving again to the same link restarts the period.
- If you want it deleted, tell us the share link address (contact).
3. Cookies and browser storage
The Service itself does not set cookies. The editor stores settings (display level of diagnostic rules, whether you dismissed the 3D controls hint, pen input settings, and display language) and copied parts in your browser storage, and this information is not sent to the server. The purpose of each item and how to delete it are listed on the Ads & Cookies page.
4. Ads (Google AdSense) and third-party cookies
Google AdSense ads may be shown on some pages of the Service (guides, calculators, and so on). The following applies when ads are shown. No ads are shown on the editor and shared board screens.
- Third-party vendors, including Google, use cookies to serve ads based on your prior visits to this site or other websites.
- Google's use of advertising cookies enables it and its partners to serve ads to you based on your visit to this site and/or other sites on the Internet.
- You can opt out of personalized advertising in Google Ad Settings. Alternatively, you can visit aboutads.info to opt out of third-party vendors' use of cookies for personalized advertising.
- How Google uses information from partner sites is explained in Google's information.
- The Service does not give advertisers personal information that identifies you.
About online behavioral advertising
| Behavioral information collected and used | Website visit history, ad impression and click information, cookies and ad identifiers |
|---|---|
| How it is collected | Collected automatically by the ad provider (Google) with cookies and similar technologies when you visit a page of the Service that has an ad area |
| Purpose of use | Serving ads that fit your interests, measuring ad performance, preventing misuse |
| Retention period | The cookie's validity period or Google's policy |
| How to refuse | Use your browser's cookie blocking and deletion settings, or opt out of personalized ads in Google Ad Settings (links above). You can still use the Service if you refuse, and ads are shown as general ads unrelated to your interests. |
The Service operator does not collect your behavioral information directly or provide it to third parties, and the ad provider's own privacy policy applies to information it collects through the ad areas.
5. External services and processing abroad
- Cloudflare, Inc. (USA): serving the site (hosting and CDN) and storing share link data. Access information and share link board data are processed.
- Google LLC (USA): providing ads (AdSense) and web fonts (Google Fonts). When fonts are loaded, your IP address and browser information are sent to Google's servers.
Because these providers' servers are overseas, access information and the like may be processed in those countries. The Service does not provide your information to third parties or outsource its processing otherwise (except for requests required by law).
6. Your rights and how to exercise them
You may at any time ask to access, correct, delete, or stop the processing of your information, and withdraw consent. If you make a request on the contact page, we will tell you the result within 10 days of receiving it. You can delete information and cookies stored in your browser yourself in your browser settings.
7. Children's personal information
The Service does not collect personal information from children under 14, and is not directed at children under 13.
8. Security measures
- All communication is encrypted with HTTPS.
- Share link addresses are random values that are hard to guess, and are deleted automatically after the retention period.
- The Service does not receive information that identifies you, which keeps the information it processes to a minimum.
- Access to the accounts used to operate the Service and manage storage is restricted.
9. Users in the European Economic Area (EEA), UK, and Switzerland
When you visit from these regions, a consent management tool certified by Google first asks for consent related to ads and cookies, and you can change or withdraw your choice at any time. The legal bases for processing are your consent to ads and cookies and our legitimate interest in providing the Service and security. You have the right to request access, correction, deletion, restriction of processing, portability, and to object, and you may lodge a complaint with the data protection authority where you live.
10. Privacy officer and contact
- Officer: The Patterndo operator
- Contact: contact page
If you need to report or seek advice about a privacy violation, you can contact the following agencies (in Korea).
- Personal Information Infringement Report Center: privacy.kisa.or.kr · dial 118
- Personal Information Dispute Mediation Committee: kopico.go.kr · 1833-6972
- Supreme Prosecutors' Office Cyber Investigation Division: spo.go.kr · dial 1301
- National Police Agency Cyber Bureau: ecrm.police.go.kr · dial 182
11. Changes to this policy
If this policy changes, we will announce it on this page together with the effective date. Important changes are announced 7 days before they take effect. The current policy has been in effect since 2026-10-12.